cis-Diaqua[(E)-2-(2-oxidobenzylideneamino-κ2N,O)benzoato-κO]copper(II): tubes built from O—H...O hydrogen-bonding, π–π and C—H...π interactions
摘要:
In the title compound, [Cu(C14H9NO3)(H2O)(2)], pairs of complexes are linked into dimers by three O-H center dot center dot center dot O hydrogen bonds. Strong O-H center dot center dot center dot O hydrogen bonds link the dimers into one-dimensional chains that further assemble into tubes through pi-pi and C-H center dot center dot center dot pi inter-actions.
Hydrogen bonding properties and intermediate structure of N-(2-carboxyphenyl)salicylidenimine
作者:Alette G. J. Ligtenbarg、Ronald Hage、Auke Meetsma、Ben L. Feringa
DOI:10.1039/a809497g
日期:——
The hydrogen bonding properties, the nature of the tautomeric structure and dimerization of N-(2-carboxyphenyl)salicylidenimine 1 has been studied. The crystal and molecular structure of 1 has been determined by single-crystal X-ray diffraction analysis. This compound forms a dimer in the solid state, which is held together by two strong intermolecular O–H· · ·O bridges [O(1)· · ·O(2a) = 2.455(1) Å]. This dimeric structure is further stabilized by two intramolecular N–H· · ·O hydrogen bonds [N(1)· · ·O(1) = 2.654(1) and N(1)· · ·O(2) = 2.663(1) Å]. In this way, an eight-membered pseudocycle is created. However, in methanol or acetonitrile solution, no dimerization was observed according to 1H-NMR, IR and UV measurements. It was also found that this compound exists as an intermediate form between a phenol-imine and an o-quinoid structure. In addition, a derivative soluble in chloroform, 2-[2-hydroxy-5-(2-butyl)benzylideneamino]benzoic acid 3, was examined for comparison.
Saravanamoorthy, Somasundaram; Velmathi, Sivan, Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 2016, vol. 55B, # 3, p. 344 - 352