A composition of {HEAD ~ matter} comprising the thin film interfacial polymerization reaction product of MF Xm and {TAIL ~ 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, X and Y are groups that are mutually reactive in a condensation reaction, and m and n are integers ≧2 
A composition of { HEAD ~ matter } comprising the thin film interfacial polymerization reaction product of MF Xm and { TAIL ~ 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 , X and Y are groups that are mutually reactive in a condensation reaction , and m and n are integers ≧2
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