Influence of the CO···π Interaction on the Thermal Dehydration Behavior of [Cu2(sgly)2(H2O)]·1H2O

The hydrogen-bonding pattern present in [Cu 2 (sgly) 2 (H 2 O)]·H 2 O [ 1; H 2 sgly = N- (2-hydroxybenzyl)glycine] has been found to be very similar to that observed in [Cu 2 (sala) 2 (H 2 O)] ( 2 ), which undergoes solid state transformation from a hydrogen-bonded one-dimensional helical coordination polymeric structure to a three-dimensional (3D) coordination polymeric network structure with chiral channels, after losing all of the water molecules below 110 °C. However, 1 fails to undergo such a transformation when dehydrated thermally. Furthermore, the intermolecular hydrogen bonds in 1 are weaker than those found in 2 . A detailed crystal structure analysis of 1 reveals that the presence of the C O···π intermolecular interaction between a carboxylate carbonyl group and a phenyl ring appears to be responsible for the weakening of hydrogen bonds, thermal dehydration behavior, preventing the formation of new Cu−O bonds and, hence, the 3D coordination polymeric network structure.