Two-dimensional hydrogen-bonded framework

II Open systems in two dimensions in which chains are linked to usually six other chains forming a two-dimensional hydrogen-bonded framework. The only known example of this type is fi polyglycine. 

Among extended polymeric structures, two-dimensional hydrogen-bonded frameworks are enormously popular, and the resulting assemblies resemble practically crinkled tapes (153,154) and infinite sheets (155-158). Smith and co-workers have structurally characterized a... 

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