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

For related structures, see: Ray *et al.* (1973[@bb6]); Bernhardt & Riley (2003[@bb1]); Cernak *et al.* (1984[@bb2]); Emsley *et al.* (1989[@bb4]); Cheng *et al.* (2008[@bb3]).

Experimental {#sec2}
============

 {#sec2.1}

### Crystal data {#sec2.1.1}

\[Zn(C~2~H~8~N~2~)~3~\](SiF~6~)*M* *~r~* = 387.77Hexagonal,*a* = 9.192 (2) Å*c* = 9.755 (3) Å*V* = 713.8 (3) Å^3^*Z* = 2Mo *K*α radiationμ = 1.87 mm^−1^*T* = 93 K0.10 × 0.10 × 0.10 mm

### Data collection {#sec2.1.2}

Rigaku Mercury CCD diffractometerAbsorption correction: multi-scan (*CrystalClear*; Rigaku, 2004[@bb7]) *T* ~min~ = 0.835, *T* ~max~ = 0.8354809 measured reflections534 independent reflections499 reflections with *I* \> 2σ(*I*)*R* ~int~ = 0.045

### Refinement {#sec2.1.3}

*R*\[*F* ^2^ \> 2σ(*F* ^2^)\] = 0.027*wR*(*F* ^2^) = 0.059*S* = 1.11534 reflections32 parametersH-atom parameters constrainedΔρ~max~ = 0.51 e Å^−3^Δρ~min~ = −0.38 e Å^−3^Absolute structure: Flack (1983[@bb5]), 177 Friedel pairsFlack parameter: 0.01 (3)

 {#d5e481}

Data collection: *CrystalClear* (Rigaku, 2004[@bb7]); cell refinement: *CrystalClear*; data reduction: *CrystalClear*; program(s) used to solve structure: *SHELXS97* (Sheldrick, 2008[@bb8]); program(s) used to refine structure: *SHELXL97* (Sheldrick, 2008[@bb8]); molecular graphics: *PLATON* (Spek, 2009[@bb9]); software used to prepare material for publication: *SHELXTL* (Sheldrick, 2008[@bb8]).

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

Crystal structure: contains datablocks I, global. DOI: [10.1107/S1600536809045693/bt5123sup1.cif](http://dx.doi.org/10.1107/S1600536809045693/bt5123sup1.cif)

Structure factors: contains datablocks I. DOI: [10.1107/S1600536809045693/bt5123Isup2.hkl](http://dx.doi.org/10.1107/S1600536809045693/bt5123Isup2.hkl)

Additional supplementary materials: [crystallographic information](http://scripts.iucr.org/cgi-bin/sendsupfiles?bt5123&file=bt5123sup0.html&mime=text/html); [3D view](http://scripts.iucr.org/cgi-bin/sendcif?bt5123sup1&Qmime=cif); [checkCIF report](http://scripts.iucr.org/cgi-bin/paper?bt5123&checkcif=yes)

Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: [BT5123](http://scripts.iucr.org/cgi-bin/sendsup?bt5123)).

The authors are grateful to the Engineering and Physical Science Research Council (EPSRC, UK) and the National Natural Science Funds of China (grant Nos. 20573077, 50672063) for financial support.

Comment
=======

A large number of salts with the general formula MG~6~L*R*~6~, where *M* is a bivalent metal, G may be water or ammonia, *L* is a quadrivalent element like Si, Sn, Ti or Zr, and *R* may be Cl, F or CN, (Ray *et al.*, 1973), were studied. We report a similar type of the title salt containing organic molecules. The molecule of the title salt, shown in Fig. 1, consists of one Zn(C~2~N~2~H~8~)~3~ cation and one SiF~6~ anion. The coordination of ZnII centers through bridging-bidentate ethylenediamine groups forms a wind-stick-like cluster. The Zn(C~2~N~2~H~8~)~3~ cluster and SiF~6~ octahedra are stacked alternately along the threefold axis in approximately CsCl-type packing.

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

A typical synthetic procedure for Zn(C~2~N~2~H~8~)~3~.SiF~6~ was as follows: a Teflon-lined autoclave (volume 15 ml) was charged with the ionic liquid \[composed of choline chloride (1630 mg, 11.4 mmol) and imidazolidone (2.045 g, 22.8 mmol)\], zinc acetate (168 mg, 0.74 mmol), NH~4~F (71 mg, 1.85 mmol), and silica (49 mg, 0.74 mmol) and heated in an oven at 180 °C for 3 days. Ethylenediamine(C~2~N~2~H~8~), derived from decomposition of the imidazolidone component of the deep-eutectic solvent (DES) itself, is delivered to the synthesis. The synthesized samples were washed with distilled water in an ultrasonic bath, then washed with acetone, and dried at room temperature in air. The colorless crystals of the title salt were abtained with suitable size for single-crystal X-ray analysis.

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

All H atoms were fixed geometrically (C---H = 0.99 Å, N---H = 0.92 Å) and treated as riding with *U*~iso~(H) = 1.2Ueq of the parent atom.

Figures
=======

![The molecular structure of the title compound with displacement ellipsoids drawn at the 50% probability level.](e-65-m1522-fig1){#Fap1}

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

  --------------------------------- ---------------------------------------
  \[Zn(C~2~H~8~N~2~)~3~\](SiF~6~)   *D*~x~ = 1.804 Mg m^−3^
  *M~r~* = 387.77                   Mo *K*α radiation, λ = 0.71073 Å
  Trigonal, *P*6~3~22               Cell parameters from 1402 reflections
  Hall symbol: P 6c 2c              θ = 6.6--54.6°
  *a* = 9.192 (2) Å                 µ = 1.87 mm^−1^
  *c* = 9.755 (3) Å                 *T* = 93 K
  *V* = 713.8 (3) Å^3^              Prism, colorless
  *Z* = 2                           0.10 × 0.10 × 0.10 mm
  *F*(000) = 400                    
  --------------------------------- ---------------------------------------

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

  ------------------------------------------------------------------ -------------------------------------
  Rigaku Mercury CCD diffractometer                                  534 independent reflections
  Radiation source: rotating anode                                   499 reflections with *I* \> 2σ(*I*)
  confocal                                                           *R*~int~ = 0.045
  Detector resolution: 0.83 pixels mm^-1^                            θ~max~ = 27.4°, θ~min~ = 3.3°
  ω scans                                                            *h* = −10→11
  Absorption correction: multi-scan (*CrystalClear*; Rigaku, 2004)   *k* = −10→11
  *T*~min~ = 0.835, *T*~max~ = 0.835                                 *l* = −11→9
  4809 measured reflections                                          
  ------------------------------------------------------------------ -------------------------------------

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

  ---------------------------------------------------------------- -------------------------------------------------------------------------------------------------
  Refinement on *F*^2^                                             Secondary atom site location: difference Fourier map
  Least-squares matrix: full                                       Hydrogen site location: inferred from neighbouring sites
  *R*\[*F*^2^ \> 2σ(*F*^2^)\] = 0.027                              H-atom parameters constrained
  *wR*(*F*^2^) = 0.059                                             *w* = 1/\[σ^2^(*F*~o~^2^) + (0.0158*P*)^2^ + 0.5912*P*\] where *P* = (*F*~o~^2^ + 2*F*~c~^2^)/3
  *S* = 1.11                                                       (Δ/σ)~max~ \< 0.001
  534 reflections                                                  Δρ~max~ = 0.51 e Å^−3^
  32 parameters                                                    Δρ~min~ = −0.38 e Å^−3^
  0 restraints                                                     Absolute structure: Flack (1983), 177 Friedel pairs
  Primary atom site location: structure-invariant direct methods   Flack parameter: 0.01 (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~   
  Si1   0.3333         0.6667       0.7500         0.0135 (3)           
  F1    0.48288 (18)   0.6657 (2)   0.85081 (14)   0.0250 (3)           
  Zn1   0.6667         0.3333       0.7500         0.01508 (18)         
  N1    0.8544 (2)     0.5434 (2)   0.87149 (19)   0.0191 (4)           
  H1A   0.8277         0.5243       0.9631         0.023\*              
  H1B   0.9584         0.5539       0.8589         0.023\*              
  C1    0.8584 (4)     0.6997 (3)   0.8277 (2)     0.0222 (5)           
  H2A   0.9655         0.7986       0.8566         0.027\*              
  H2B   0.7651         0.7070       0.8716         0.027\*              
  ----- -------------- ------------ -------------- -------------------- --

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

  ----- ------------- ------------- ------------- -------------- -------------- -------------
        *U*^11^       *U*^22^       *U*^33^       *U*^12^        *U*^13^        *U*^23^
  Si1   0.0151 (4)    0.0151 (4)    0.0102 (7)    0.0076 (2)     0.000          0.000
  F1    0.0260 (7)    0.0352 (8)    0.0183 (7)    0.0186 (7)     −0.0057 (6)    −0.0011 (7)
  Zn1   0.0169 (2)    0.0169 (2)    0.0115 (3)    0.00843 (11)   0.000          0.000
  N1    0.0185 (10)   0.0240 (11)   0.0137 (11)   0.0097 (9)     −0.0018 (8)    0.0003 (8)
  C1    0.0234 (13)   0.0195 (11)   0.0225 (12)   0.0099 (13)    −0.0031 (12)   −0.0037 (8)
  ----- ------------- ------------- ------------- -------------- -------------- -------------

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

  -------------------------- -------------- -------------------------- -------------
  Si1---F1^i^                1.6938 (13)    Zn1---N1^v^                2.186 (2)
  Si1---F1^ii^               1.6938 (13)    Zn1---N1^viii^             2.1863 (19)
  Si1---F1^iii^              1.6938 (14)    Zn1---N1^ix^               2.1863 (19)
  Si1---F1^iv^               1.6938 (14)    N1---C1                    1.482 (3)
  Si1---F1                   1.6938 (13)    N1---H1A                   0.9200
  Si1---F1^v^                1.6938 (13)    N1---H1B                   0.9200
  Zn1---N1^vi^               2.1863 (19)    C1---C1^viii^              1.523 (4)
  Zn1---N1^vii^              2.1863 (19)    C1---H2A                   0.9900
  Zn1---N1                   2.186 (2)      C1---H2B                   0.9900
                                                                       
  F1^i^---Si1---F1^ii^       90.69 (10)     N1^vi^---Zn1---N1^viii^    93.40 (7)
  F1^i^---Si1---F1^iii^      89.68 (7)      N1^vii^---Zn1---N1^viii^   170.67 (11)
  F1^ii^---Si1---F1^iii^     89.95 (10)     N1---Zn1---N1^viii^        80.19 (10)
  F1^i^---Si1---F1^iv^       89.95 (10)     N1^v^---Zn1---N1^viii^     93.40 (7)
  F1^ii^---Si1---F1^iv^      89.68 (7)      N1^vi^---Zn1---N1^ix^      170.67 (11)
  F1^iii^---Si1---F1^iv^     179.47 (11)    N1^vii^---Zn1---N1^ix^     93.40 (7)
  F1^i^---Si1---F1           179.47 (11)    N1---Zn1---N1^ix^          93.40 (7)
  F1^ii^---Si1---F1          89.68 (7)      N1^v^---Zn1---N1^ix^       80.19 (10)
  F1^iii^---Si1---F1         90.69 (10)     N1^viii^---Zn1---N1^ix^    93.74 (11)
  F1^iv^---Si1---F1          89.68 (7)      C1---N1---Zn1              109.01 (14)
  F1^i^---Si1---F1^v^        89.68 (7)      C1---N1---H1A              109.9
  F1^ii^---Si1---F1^v^       179.47 (11)    Zn1---N1---H1A             109.9
  F1^iii^---Si1---F1^v^      89.68 (7)      C1---N1---H1B              109.9
  F1^iv^---Si1---F1^v^       90.69 (10)     Zn1---N1---H1B             109.9
  F1---Si1---F1^v^           89.95 (10)     H1A---N1---H1B             108.3
  N1^vi^---Zn1---N1^vii^     80.19 (10)     N1---C1---C1^viii^         109.52 (17)
  N1^vi^---Zn1---N1          93.74 (11)     N1---C1---H2A              109.8
  N1^vii^---Zn1---N1         93.40 (7)      C1^viii^---C1---H2A        109.8
  N1^vi^---Zn1---N1^v^       93.40 (7)      N1---C1---H2B              109.8
  N1^vii^---Zn1---N1^v^      93.74 (11)     C1^viii^---C1---H2B        109.8
  N1---Zn1---N1^v^           170.67 (11)    H2A---C1---H2B             108.2
                                                                       
  N1^vi^---Zn1---N1---C1     106.99 (17)    N1^ix^---Zn1---N1---C1     −79.03 (19)
  N1^vii^---Zn1---N1---C1    −172.64 (16)   Zn1---N1---C1---C1^viii^   −39.9 (3)
  N1^viii^---Zn1---N1---C1   14.19 (13)                                
  -------------------------- -------------- -------------------------- -------------

Symmetry codes: (i) −*x*+*y*, *y*, −*z*+3/2; (ii) −*y*+1, *x*−*y*+1, *z*; (iii) *x*, *x*−*y*+1, −*z*+3/2; (iv) −*x*+*y*, −*x*+1, *z*; (v) −*y*+1, −*x*+1, −*z*+3/2; (vi) *x*, *x*−*y*, −*z*+3/2; (vii) −*x*+*y*+1, −*x*+1, *z*; (viii) −*x*+*y*+1, *y*, −*z*+3/2; (ix) −*y*+1, *x*−*y*, *z*.

Hydrogen-bond geometry (Å, °) {#tablewraphbondslong}
=============================

  -------------------- --------- --------- ----------- ---------------
  *D*---H···*A*        *D*---H   H···*A*   *D*···*A*   *D*---H···*A*
  N1---H1A···F1^x^     0.92      2.26      3.113 (3)   155
  N1---H1A···F1^xi^    0.92      2.49      3.239 (3)   139
  N1---H1B···F1^vii^   0.92      2.25      3.153 (3)   166
  -------------------- --------- --------- ----------- ---------------

Symmetry codes: (x) *y*, *x*, −*z*+2; (xi) *x*−*y*+1, −*y*+1, −*z*+2; (vii) −*x*+*y*+1, −*x*+1, *z*.

###### Hydrogen-bond geometry (Å, °)

  *D*---H⋯*A*          *D*---H   H⋯*A*   *D*⋯*A*     *D*---H⋯*A*
  -------------------- --------- ------- ----------- -------------
  N1---H1*A*⋯F1^i^     0.92      2.26    3.113 (3)   155
  N1---H1*A*⋯F1^ii^    0.92      2.49    3.239 (3)   139
  N1---H1*B*⋯F1^iii^   0.92      2.25    3.153 (3)   166

Symmetry codes: (i) ; (ii) ; (iii) .
