Related literature   {#sec1}
====================

For the isostructural Eu^III^ and U^III^ compounds, see: Tang *et al.* (2011[@bb6]) and Natrajan *et al.* (2005[@bb4]), respectively.

Experimental   {#sec2}
==============

 {#sec2.1}

### Crystal data   {#sec2.1.1}

\[Pr(CF~3~O~3~S)~3~(C~2~H~3~N)~3~\]*M* *~r~* = 711.28Triclinic,*a* = 5.8044 (6) Å*b* = 10.5062 (10) Å*c* = 18.9887 (19) Åα = 97.307 (1)°β = 94.163 (1)°γ = 91.695 (1)°*V* = 1144.7 (2) Å^3^*Z* = 2Mo *K*α radiationμ = 2.52 mm^−1^*T* = 103 K0.24 × 0.02 × 0.01 mm

### Data collection   {#sec2.1.2}

Bruker APEXII Quazar diffractometerAbsorption correction: multi-scan (*SADABS*; Bruker, 2001[@bb1]) *T* ~min~ = 0.578, *T* ~max~ = 0.97820544 measured reflections5251 independent reflections4674 reflections with *I* \> 2σ(*I*)*R* ~int~ = 0.039

### Refinement   {#sec2.1.3}

*R*\[*F* ^2^ \> 2σ(*F* ^2^)\] = 0.036*wR*(*F* ^2^) = 0.076*S* = 1.165251 reflections311 parametersH-atom parameters constrainedΔρ~max~ = 1.04 e Å^−3^Δρ~min~ = −1.15 e Å^−3^

 {#d5e505}

Data collection: *APEX2* (Bruker, 2007[@bb2]); cell refinement: *SAINT* (Bruker, 2007[@bb2]); data reduction: *SAINT*; program(s) used to solve structure: *SHELXS97* (Sheldrick, 2008[@bb5]); program(s) used to refine structure: *SHELXL97* (Sheldrick, 2008[@bb5]); molecular graphics: *XPMA* (Zsolnai, 1996[@bb8]) and *ORTEP-3* (Farrugia, 2012[@bb3]); software used to prepare material for publication: *publCIF* (Westrip, 2010[@bb7]).

Supplementary Material
======================

###### 

Click here for additional data file.

Crystal structure: contains datablock(s) I, global. DOI: [10.1107/S1600536812049525/vn2063sup1.cif](http://dx.doi.org/10.1107/S1600536812049525/vn2063sup1.cif)

###### 

Click here for additional data file.

Structure factors: contains datablock(s) I. DOI: [10.1107/S1600536812049525/vn2063Isup2.hkl](http://dx.doi.org/10.1107/S1600536812049525/vn2063Isup2.hkl)

###### 

Click here for additional data file.

Supplementary material file. DOI: [10.1107/S1600536812049525/vn2063Isup3.mol](http://dx.doi.org/10.1107/S1600536812049525/vn2063Isup3.mol)

Additional supplementary materials: [crystallographic information](http://scripts.iucr.org/cgi-bin/sendsupfiles?vn2063&file=vn2063sup0.html&mime=text/html); [3D view](http://scripts.iucr.org/cgi-bin/sendcif?vn2063sup1&Qmime=cif); [checkCIF report](http://scripts.iucr.org/cgi-bin/paper?vn2063&checkcif=yes)

Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: [VN2063](http://scripts.iucr.org/cgi-bin/sendsup?vn2063)).

Comment
=======

The coordination environment of the Pr^III^ atom ion in the title compound can be described as a distorted trigonal tri-capped prism. 6 O atoms are forming the trigonal prismatic environment around the Pr^III^ atom and the three N atoms of the coordinated MeCN solvent molecules are forming the cappings over the rectangular sides of the prism. The metal-O distances in the title compound are with an average of 2.458 (13) Å about 0.05 Å longer than in the corresponding Eu complex (Tang *et al.*, 2011) and 0.04 Å shorter than in its U analogue (Natrajan *et al.*, 2005) reflecting the effects of the lanthanide contraction and also the change from a lanthanide to an actinide ion. The metal-N distances with 2.588 (17) Å for the Eu complex are about 0.05 Å shorter than for the here presented Pr compound with 2.640 (17) Å, whereas the latter are found to be in very good agreement with those in the U complex with 2.651 (14) Å. The ion size increase while changing the metal ion in the complex from Pr to U seems to influence more the shorter metal-O distances than the longer metal-N distances for the solvent molecules forming the cappings of the trigonal prism.

Experimental {#experimental}
============

Crystals from the title compound precipitated after a ligand exchange reaction from 103.1 mg (0.13 mmol) \[Pr(H~2~O)~9~\](OTf)~3~ in 2 ml of MeCN. Crystals in the form of needles suitable for x-ray analysis were obtained by re-crystallization from hot MeCN.

Refinement {#refinement}
==========

All H atoms were placed on geometrical positions according to the hybridization of the atoms they are bound to. One common isotropic *U* value was used and refined for all hydrogen atoms.

Figures
=======

![Molecular structure of the title compound; ellipsoids at the 50% probability level (symmetry codes: a = x + 1, y, z; b = x - 1, y, z).](e-69-00m21-fig1){#Fap1}

Crystal data {#tablewrapcrystaldatalong}
============

  ------------------------------------- ---------------------------------------
  \[Pr(CF~3~O~3~S)~3~(C~2~H~3~N)~3~\]   *Z* = 2
  *M~r~* = 711.28                       *F*(000) = 688
  Triclinic, *P*1                       *D*~x~ = 2.064 Mg m^−3^
  Hall symbol: -P 1                     Mo *K*α radiation, λ = 0.71073 Å
  *a* = 5.8044 (6) Å                    Cell parameters from 9222 reflections
  *b* = 10.5062 (10) Å                  θ = 2.2--28.1°
  *c* = 18.9887 (19) Å                  µ = 2.52 mm^−1^
  α = 97.307 (1)°                       *T* = 103 K
  β = 94.163 (1)°                       Needle, colourless
  γ = 91.695 (1)°                       0.24 × 0.02 × 0.01 mm
  *V* = 1144.7 (2) Å^3^                 
  ------------------------------------- ---------------------------------------

Data collection {#tablewrapdatacollectionlong}
===============

  ------------------------------------------------------------ --------------------------------------
  Bruker APEXII Quazar diffractometer                          5251 independent reflections
  Radiation source: fine-focus sealed tube                     4674 reflections with *I* \> 2σ(*I*)
  Graphite monochromator                                       *R*~int~ = 0.039
  Detector resolution: 66 pixels mm^-1^                        θ~max~ = 28.2°, θ~min~ = 1.1°
  combined ω and φ scans                                       *h* = −7→7
  Absorption correction: multi-scan (*SADABS*; Bruker, 2001)   *k* = −13→13
  *T*~min~ = 0.578, *T*~max~ = 0.978                           *l* = −25→24
  20544 measured reflections                                   
  ------------------------------------------------------------ --------------------------------------

Refinement {#tablewraprefinementdatalong}
==========

  ------------------------------------- ------------------------------------------------------------------------------------------------
  Refinement on *F*^2^                  Primary atom site location: structure-invariant direct methods
  Least-squares matrix: full            Secondary atom site location: difference Fourier map
  *R*\[*F*^2^ \> 2σ(*F*^2^)\] = 0.036   Hydrogen site location: inferred from neighbouring sites
  *wR*(*F*^2^) = 0.076                  H-atom parameters constrained
  *S* = 1.16                            *w* = 1/\[σ^2^(*F*~o~^2^) + (0.0169*P*)^2^ + 4.422*P*\] where *P* = (*F*~o~^2^ + 2*F*~c~^2^)/3
  5251 reflections                      (Δ/σ)~max~ = 0.001
  311 parameters                        Δρ~max~ = 1.04 e Å^−3^
  0 restraints                          Δρ~min~ = −1.15 e Å^−3^
  ------------------------------------- ------------------------------------------------------------------------------------------------

Special details {#specialdetails}
===============

  -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
  Geometry. All e.s.d.\'s (except the e.s.d. in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell e.s.d.\'s are taken into account individually in the estimation of e.s.d.\'s in distances, angles and torsion angles; correlations between e.s.d.\'s in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell e.s.d.\'s is used for estimating e.s.d.\'s involving l.s. planes.
  Refinement. Refinement of *F*^2^ against ALL reflections. The weighted *R*-factor *wR* and goodness of fit *S* are based on *F*^2^, conventional *R*-factors *R* are based on *F*, with *F* set to zero for negative *F*^2^. The threshold expression of *F*^2^ \> σ(*F*^2^) is used only for calculating *R*-factors(gt) *etc*. and is not relevant to the choice of reflections for refinement. *R*-factors based on *F*^2^ are statistically about twice as large as those based on *F*, and *R*- factors based on ALL data will be even larger.
  -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å^2^) {#tablewrapcoords}
==================================================================================================

  ----- -------------- --------------- --------------- -------------------- --
        *x*            *y*             *z*             *U*~iso~\*/*U*~eq~   
  Pr1   1.07535 (4)    0.07978 (2)     0.262548 (13)   0.01276 (7)          
  S1    0.56250 (16)   0.18346 (10)    0.15067 (6)     0.0158 (2)           
  S2    0.61165 (16)   0.18294 (10)    0.39162 (6)     0.0158 (2)           
  S3    0.55261 (16)   −0.16488 (10)   0.24609 (6)     0.0147 (2)           
  F1    0.6947 (6)     0.3922 (3)      0.10237 (19)    0.0467 (9)           
  F2    0.3309 (6)     0.3778 (3)      0.11712 (19)    0.0450 (9)           
  F3    0.5755 (5)     0.4245 (3)      0.20746 (15)    0.0299 (6)           
  F4    0.7997 (5)     0.3949 (3)      0.46088 (18)    0.0440 (8)           
  F5    0.4258 (5)     0.3828 (3)      0.45649 (18)    0.0422 (8)           
  F6    0.5975 (5)     0.4226 (3)      0.36502 (17)    0.0344 (7)           
  F7    0.7193 (5)     −0.3223 (3)     0.14700 (16)    0.0320 (7)           
  F8    0.3474 (5)     −0.3357 (3)     0.14802 (16)    0.0338 (7)           
  F9    0.5120 (4)     −0.1770 (3)     0.10682 (14)    0.0258 (6)           
  O1    0.3838 (5)     0.1578 (3)      0.19688 (18)    0.0240 (7)           
  O2    0.7937 (5)     0.1773 (3)      0.18415 (17)    0.0216 (7)           
  O3    0.5278 (6)     0.1225 (3)      0.07935 (17)    0.0276 (7)           
  O4    0.3864 (5)     0.1540 (3)      0.35450 (17)    0.0223 (7)           
  O5    0.7984 (5)     0.1725 (3)      0.34527 (17)    0.0230 (7)           
  O6    0.6489 (5)     0.1277 (3)      0.45609 (17)    0.0270 (7)           
  O7    0.7431 (5)     −0.0746 (3)     0.24309 (17)    0.0208 (7)           
  O8    0.3323 (5)     −0.1040 (3)     0.25044 (16)    0.0186 (6)           
  O9    0.5924 (5)     −0.2595 (3)     0.29293 (17)    0.0233 (7)           
  N1    1.0406 (6)     −0.0433 (4)     0.1330 (2)      0.0225 (8)           
  N2    1.1033 (6)     0.3339 (4)      0.2835 (2)      0.0216 (8)           
  N3    1.0456 (6)     −0.0546 (4)     0.3708 (2)      0.0214 (8)           
  C1    0.5396 (8)     0.3551 (4)      0.1440 (3)      0.0238 (10)          
  C2    0.6081 (8)     0.3553 (5)      0.4193 (3)      0.0270 (11)          
  C3    0.5309 (7)     −0.2545 (4)     0.1566 (2)      0.0207 (9)           
  C4    1.0185 (7)     −0.1019 (5)     0.0786 (3)      0.0219 (10)          
  C5    0.9892 (9)     −0.1778 (6)     0.0081 (3)      0.0377 (13)          
  H5A   0.9788         −0.2693         0.0134          0.083 (9)\*          
  H5B   1.1219         −0.1607         −0.0189         0.083 (9)\*          
  H5C   0.8472         −0.1540         −0.0174         0.083 (9)\*          
  C6    1.0979 (7)     0.4424 (5)      0.2948 (3)      0.0261 (11)          
  C7    1.0879 (10)    0.5816 (5)      0.3096 (5)      0.057 (2)            
  H7A   0.9471         0.6098          0.2854          0.083 (9)\*          
  H7B   1.2236         0.6219          0.2923          0.083 (9)\*          
  H7C   1.0864         0.6067          0.3611          0.083 (9)\*          
  C8    0.9551 (7)     −0.1080 (4)     0.4105 (2)      0.0212 (9)           
  C9    0.8291 (8)     −0.1738 (5)     0.4598 (3)      0.0283 (11)          
  H9A   0.7095         −0.1184         0.4790          0.083 (9)\*          
  H9B   0.9365         −0.1933         0.4989          0.083 (9)\*          
  H9C   0.7567         −0.2538         0.4346          0.083 (9)\*          
  ----- -------------- --------------- --------------- -------------------- --

Atomic displacement parameters (Å^2^) {#tablewrapadps}
=====================================

  ----- ------------- -------------- -------------- -------------- -------------- --------------
        *U*^11^       *U*^22^        *U*^33^        *U*^12^        *U*^13^        *U*^23^
  Pr1   0.00653 (9)   0.01308 (12)   0.01839 (12)   −0.00110 (7)   0.00174 (7)    0.00089 (8)
  S1    0.0118 (4)    0.0162 (5)     0.0198 (5)     −0.0006 (4)    0.0023 (4)     0.0039 (4)
  S2    0.0104 (4)    0.0182 (5)     0.0177 (5)     −0.0012 (4)    0.0018 (4)     −0.0015 (4)
  S3    0.0101 (4)    0.0124 (5)     0.0215 (5)     −0.0011 (3)    0.0013 (4)     0.0017 (4)
  F1    0.069 (2)     0.0256 (17)    0.051 (2)      −0.0047 (15)   0.0294 (18)    0.0160 (16)
  F2    0.0451 (19)   0.0280 (17)    0.059 (2)      0.0138 (14)    −0.0205 (16)   0.0072 (16)
  F3    0.0326 (15)   0.0204 (15)    0.0351 (17)    0.0005 (11)    0.0012 (12)    −0.0014 (12)
  F4    0.0312 (16)   0.0360 (18)    0.055 (2)      −0.0067 (13)   −0.0136 (14)   −0.0178 (16)
  F5    0.0357 (16)   0.0319 (18)    0.056 (2)      0.0040 (13)    0.0219 (15)    −0.0165 (15)
  F6    0.0276 (15)   0.0199 (15)    0.056 (2)      −0.0004 (11)   0.0017 (13)    0.0051 (14)
  F7    0.0307 (15)   0.0266 (16)    0.0381 (17)    0.0115 (12)    0.0087 (12)    −0.0034 (13)
  F8    0.0293 (15)   0.0263 (16)    0.0419 (18)    −0.0140 (12)   0.0013 (12)    −0.0068 (13)
  F9    0.0236 (13)   0.0315 (16)    0.0222 (14)    0.0012 (11)    0.0006 (10)    0.0031 (12)
  O1    0.0164 (14)   0.0217 (17)    0.0349 (19)    −0.0018 (12)   0.0103 (13)    0.0036 (14)
  O2    0.0137 (14)   0.0215 (17)    0.0292 (18)    −0.0002 (12)   −0.0021 (12)   0.0045 (14)
  O3    0.0307 (17)   0.0279 (19)    0.0228 (18)    −0.0002 (14)   0.0009 (13)    −0.0010 (14)
  O4    0.0141 (14)   0.0206 (17)    0.0297 (18)    −0.0033 (12)   −0.0037 (12)   −0.0019 (14)
  O5    0.0198 (15)   0.0198 (17)    0.0299 (18)    0.0023 (12)    0.0111 (13)    −0.0002 (14)
  O6    0.0243 (16)   0.034 (2)      0.0228 (18)    0.0030 (14)    0.0035 (13)    0.0051 (15)
  O7    0.0120 (13)   0.0223 (17)    0.0275 (18)    −0.0090 (11)   0.0001 (12)    0.0034 (14)
  O8    0.0146 (14)   0.0171 (16)    0.0242 (17)    0.0023 (11)    0.0031 (11)    0.0010 (13)
  O9    0.0208 (15)   0.0204 (17)    0.0304 (19)    −0.0004 (12)   0.0013 (13)    0.0110 (14)
  N1    0.0139 (17)   0.029 (2)      0.024 (2)      0.0009 (15)    0.0015 (14)    0.0008 (18)
  N2    0.0129 (16)   0.020 (2)      0.032 (2)      −0.0025 (14)   0.0031 (14)    0.0038 (17)
  N3    0.0165 (17)   0.022 (2)      0.026 (2)      0.0023 (14)    0.0029 (15)    0.0017 (17)
  C1    0.025 (2)     0.018 (2)      0.029 (3)      0.0009 (17)    0.0011 (18)    0.008 (2)
  C2    0.018 (2)     0.025 (3)      0.034 (3)      −0.0017 (18)   0.0005 (18)    −0.010 (2)
  C3    0.0157 (19)   0.017 (2)      0.027 (3)      −0.0003 (16)   0.0022 (17)    −0.0055 (19)
  C4    0.0127 (19)   0.029 (3)      0.024 (3)      0.0004 (17)    0.0024 (16)    0.005 (2)
  C5    0.038 (3)     0.051 (4)      0.021 (3)      0.000 (2)      0.002 (2)      −0.006 (2)
  C6    0.0120 (19)   0.023 (3)      0.044 (3)      −0.0016 (16)   0.0060 (18)    0.004 (2)
  C7    0.032 (3)     0.016 (3)      0.123 (7)      −0.001 (2)     0.022 (3)      0.002 (3)
  C8    0.017 (2)     0.022 (2)      0.025 (2)      0.0014 (17)    0.0001 (17)    0.002 (2)
  C9    0.022 (2)     0.041 (3)      0.023 (2)      −0.005 (2)     0.0025 (18)    0.010 (2)
  ----- ------------- -------------- -------------- -------------- -------------- --------------

Geometric parameters (Å, º) {#tablewrapgeomlong}
===========================

  --------------------- ------------- ------------------- -------------
  Pr1---O1^i^           2.435 (3)     F4---C2             1.340 (5)
  Pr1---O2              2.464 (3)     F5---C2             1.333 (5)
  Pr1---O4^i^           2.455 (3)     F6---C2             1.320 (6)
  Pr1---O5              2.464 (3)     F7---C3             1.333 (5)
  Pr1---O7              2.459 (3)     F8---C3             1.332 (5)
  Pr1---O8^i^           2.473 (3)     F9---C3             1.324 (5)
  Pr1---N1              2.621 (4)     O1---Pr1^ii^        2.435 (3)
  Pr1---N2              2.648 (4)     O4---Pr1^ii^        2.455 (3)
  Pr1---N3              2.651 (4)     O8---Pr1^ii^        2.473 (3)
  S1---O3               1.420 (3)     N1---C4             1.130 (6)
  S1---O1               1.447 (3)     N2---C6             1.134 (6)
  S1---O2               1.450 (3)     N3---C8             1.142 (6)
  S1---C1               1.832 (5)     C4---C5             1.464 (7)
  S2---O6               1.426 (3)     C5---H5A            0.9800
  S2---O5               1.443 (3)     C5---H5B            0.9800
  S2---O4               1.445 (3)     C5---H5C            0.9800
  S2---C2               1.822 (5)     C6---C7             1.457 (7)
  S3---O9               1.429 (3)     C7---H7A            0.9800
  S3---O7               1.444 (3)     C7---H7B            0.9800
  S3---O8               1.449 (3)     C7---H7C            0.9800
  S3---C3               1.829 (5)     C8---C9             1.457 (6)
  F1---C1               1.322 (5)     C9---H9A            0.9800
  F2---C1               1.320 (5)     C9---H9B            0.9800
  F3---C1               1.326 (5)     C9---H9C            0.9800
                                                          
  O1^i^---Pr1---O4^i^   75.59 (11)    O9---S3---C3        105.0 (2)
  O1^i^---Pr1---O7      139.23 (11)   O7---S3---C3        102.39 (19)
  O4^i^---Pr1---O7      139.22 (11)   O8---S3---C3        103.59 (19)
  O1^i^---Pr1---O2      88.88 (10)    S1---O1---Pr1^ii^   170.4 (2)
  O4^i^---Pr1---O2      137.29 (10)   S1---O2---Pr1       151.05 (19)
  O7---Pr1---O2         75.57 (10)    S2---O4---Pr1^ii^   162.7 (2)
  O1^i^---Pr1---O5      137.30 (11)   S2---O5---Pr1       161.1 (2)
  O4^i^---Pr1---O5      88.00 (10)    S3---O7---Pr1       169.2 (2)
  O7---Pr1---O5         76.01 (10)    S3---O8---Pr1^ii^   155.19 (18)
  O2---Pr1---O5         76.90 (11)    C4---N1---Pr1       175.9 (4)
  O1^i^---Pr1---O8^i^   77.31 (10)    C6---N2---Pr1       174.3 (3)
  O4^i^---Pr1---O8^i^   79.12 (10)    C8---N3---Pr1       156.4 (3)
  O7---Pr1---O8^i^      88.37 (10)    F2---C1---F1        109.2 (4)
  O2---Pr1---O8^i^      136.43 (10)   F2---C1---F3        108.1 (4)
  O5---Pr1---O8^i^      138.43 (10)   F1---C1---F3        108.5 (4)
  O1^i^---Pr1---N1      71.04 (11)    F2---C1---S1        110.0 (3)
  O4^i^---Pr1---N1      137.12 (11)   F1---C1---S1        109.9 (3)
  O7---Pr1---N1         68.20 (11)    F3---C1---S1        111.1 (3)
  O2---Pr1---N1         68.43 (11)    F6---C2---F5        107.8 (4)
  O5---Pr1---N1         134.88 (11)   F6---C2---F4        107.8 (4)
  O8^i^---Pr1---N1      68.00 (11)    F5---C2---F4        108.2 (4)
  O1^i^---Pr1---N2      70.21 (11)    F6---C2---S2        112.9 (3)
  O4^i^---Pr1---N2      70.03 (11)    F5---C2---S2        110.0 (3)
  O7---Pr1---N2         132.10 (10)   F4---C2---S2        110.0 (3)
  O2---Pr1---N2         67.28 (11)    F9---C3---F8        108.5 (4)
  O5---Pr1---N2         67.15 (11)    F9---C3---F7        108.1 (4)
  O8^i^---Pr1---N2      139.51 (10)   F8---C3---F7        108.3 (4)
  N1---Pr1---N2         120.35 (12)   F9---C3---S3        111.7 (3)
  O1^i^---Pr1---N3      136.38 (11)   F8---C3---S3        110.3 (3)
  O4^i^---Pr1---N3      71.01 (11)    F7---C3---S3        109.8 (3)
  O7---Pr1---N3         68.24 (11)    N1---C4---C5        179.8 (6)
  O2---Pr1---N3         134.74 (10)   C4---C5---H5A       109.5
  O5---Pr1---N3         68.85 (11)    C4---C5---H5B       109.5
  O8^i^---Pr1---N3      69.59 (11)    H5A---C5---H5B      109.5
  N1---Pr1---N3         118.54 (12)   C4---C5---H5C       109.5
  N2---Pr1---N3         120.91 (12)   H5A---C5---H5C      109.5
  O3---S1---O1          115.7 (2)     H5B---C5---H5C      109.5
  O3---S1---O2          115.4 (2)     N2---C6---C7        179.2 (5)
  O1---S1---O2          112.91 (19)   C6---C7---H7A       109.5
  O3---S1---C1          104.8 (2)     C6---C7---H7B       109.5
  O1---S1---C1          103.3 (2)     H7A---C7---H7B      109.5
  O2---S1---C1          102.54 (19)   C6---C7---H7C       109.5
  O6---S2---O5          115.65 (19)   H7A---C7---H7C      109.5
  O6---S2---O4          114.9 (2)     H7B---C7---H7C      109.5
  O5---S2---O4          113.45 (19)   N3---C8---C9        177.2 (5)
  O6---S2---C2          105.1 (2)     C8---C9---H9A       109.5
  O5---S2---C2          102.6 (2)     C8---C9---H9B       109.5
  O4---S2---C2          102.99 (19)   H9A---C9---H9B      109.5
  O9---S3---O7          115.75 (18)   C8---C9---H9C       109.5
  O9---S3---O8          115.15 (19)   H9A---C9---H9C      109.5
  O7---S3---O8          112.91 (18)   H9B---C9---H9C      109.5
  --------------------- ------------- ------------------- -------------

Symmetry codes: (i) *x*+1, *y*, *z*; (ii) *x*−1, *y*, *z*.

###### Selected bond lengths (Å)

  ------------- -----------
  Pr1---O1^i^   2.435 (3)
  Pr1---O2      2.464 (3)
  Pr1---O4^i^   2.455 (3)
  Pr1---O5      2.464 (3)
  Pr1---O7      2.459 (3)
  Pr1---O8^i^   2.473 (3)
  Pr1---N1      2.621 (4)
  Pr1---N2      2.648 (4)
  Pr1---N3      2.651 (4)
  ------------- -----------

Symmetry code: (i) .

[^1]: Also affiliated to: IKFT, KIT-Campus Nord, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany.
