Calorimetric Study of Correlated Disordering in [Hdamel]2[CuII(tdpd)2]·2THF Crystal

Autor:	Yasuhisa Yamamura, Hiroyasu Shimoi, Masato Sumita, Kazuya Saito, Keiichi Adachi, Syuma Yasuzuka, Akira Fuyuhiro, Satoshi Kawata
Rok vydání:	2008
Předmět:	Crystal Crystallography Chemistry Calorimetry Physical and Theoretical Chemistry Orientation (graph theory) Adiabatic process Heat capacity
Zdroj:	The Journal of Physical Chemistry A. 112:4465-4469
ISSN:	1520-5215 1089-5639
Popis:	The heat capacity of [Hdamel]2[Cu(II)(tdpd)2] x 2 THF was measured from 6 to 250 K by adiabatic calorimetry. There are four heat anomalies around 150 K associated with disordering in the orientation of the uncoordinated THF molecules and in the conformation of the out-of-plane allyl groups of [Hdamel](+) units. The total entropy of transition was determined to be 19.8 J K(-1) mol(-1), less than the 4R ln 2 (R = gas constant) expected from the crystal structure at room temperature. The smallness of the total entropy change on phase transitions proves the presence of the strong motional correlation between the adjacent allyl groups. The calorimetric conclusion agreed with the crystal structure at 200 K re-examined in this study.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d0f8bb0450f40e1a6101c0620f12baea https://doi.org/10.1021/jp710936q Zobrazit plný text záznamu