Crystal architecture and mesophase structure of long-chain N-alkylpyridinium tetrachlorometallates

Autor:	Alessandra Crispini, Oriano Francescangeli, Francesco Neve
Rok vydání:	2002
Předmět:	Inorganic Chemistry Crystal Crystallography Differential scanning calorimetry Polymorphism (materials science) Chemistry Materials Chemistry Supramolecular chemistry Mesophase Crystal structure Physical and Theoretical Chemistry Thermotropic crystal Powder diffraction
Zdroj:	Inorganica Chimica Acta. 338:51-58
ISSN:	0020-1693
Popis:	The N-hexadecylpyridinium derivatives [C16Py]2[MCl4] (M=Cd (1), Zn (2)) were prepared and structurally characterized by X-ray diffraction methods. The crystal structure of 1 reveals a layered arrangement with alternation of monolayers of interdigitated cations with layers of isolated [CdCl4]2− anions. CH⋯ClCd interactions reinforce the association between anions and cations in the polar region of the supramolecular structure. Both 1 and 2 display a thermotropic smectic A phase in addition to some high-temperature crystalline modifications. The thermal polymorphism of the salts was studied by X-ray powder diffraction, differential scanning calorimetry (DSC), and thermal optical microscopy. The structural and mesomorphic characteristics of 1 and 2 are compared with those of the analogous salts along the series [C16Py]2[MCl4] (M=Co, Ni, Cu, Zn, Pd, Cd).
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::d9f8f24805dfefeb842ae732e4f13439 https://doi.org/10.1016/s0020-1693(02)00976-3 Zobrazit plný text záznamu Full Text from ScienceDirect