Abstract

Abstract X-Ray structures of three co-crystals of 2,2′-(ethylenedioxy)-diethylamine, normally occuring in liquid phase, with two molecules of fumaric - 1a, maleic - 1b, and one molecule of adipic acid - 1d, have been determined. Two conformations of the diamine molecule with different degrees of folding have been found in the crystal. Very selective molecular recognition between diprotonated diamine 1 and dicarboxylic acid molecules was observed in three crystal structures. Aggregates being building blocks of the co-crystals included one doubly protonated diamine molecule and six diacid molecules at different protonation levels, hydrogen-bonded through carbonyl groups.

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