The conformational polymorphism and weak interactions in solid state structures of ten new monomeric and dimeric substituted dibenzyldimethylammonium chloridopalladate salts

: Peuronen A, Lahtinen M, Valkonen J

Publisher: ROYAL SOC CHEMISTRY

: 2009

: CrystEngComm

: CRYSTENGCOMM

: 11

: 2344

: 2357

: 14

: 1466-8033

DOI: https://doi.org/10.1039/b905421a

In this study, ten new dibenzyldimethyl/ethyl ammonium chloridopalladate(II) compounds with five different cations and two anions have been synthesized and a simple method for a synthesis, in which hydrochloric acid solutions are used, has been described. Furthermore, twelve structures including two polymorphs have been obtained from hydrochloric and methanol/acetonitrile solutions. The anion-cation and cation-cation interactions of the synthesized compounds have been studied mainly by means of single X-ray diffraction in order to study the effects of varying either the anion or the cations in these QA(2)PdCl(4) and QA(2)Pd(2)Cl(6) salts. The results indicate that the effects of intermolecular cation-cation pi center dot center dot center dot pi and C-H center dot center dot center dot pi interactions induce distinct cation pairing in the structures where cations occupy the W-conformation. Moreover, the conformational changes in the cations, i.e. either the twisted/w conformations or parallel/antiparallel positions of the phenyl substituents, are found to induce polymorphism in these compounds. All structures are found to be stabilized by anion-cation C-H center dot center dot center dot Cl interactions.