A composition of matter comprising the thin film interfacial polymerization reaction product of MF Xm and NYn wherein MF is a moiety having chemical species specific reversibly complexing complexing sites, N is a moiety not having any chemical species specific complexing sites, {HEAD ~ X} and Y are {TAIL ~ groups} that are mutually reactive in a condensation reaction, and m and n are integers ≧2 
A composition of matter comprising the thin film interfacial polymerization reaction product of MF Xm and NYn wherein MF is a moiety having chemical species specific reversibly complexing complexing sites , N is a moiety not having any chemical species specific complexing sites , { HEAD ~ X } and Y are { TAIL ~ groups } that are mutually reactive in a condensation reaction , and m and n are integers ≧2
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