The dimeric Co2(CO)6(AsPh3)2 molecule contains an unsupported Co-Co bond, axial arsines, and equatorial carbonyls. At room temperature, the molecule crystallizes in the R3̄ space group [a = 15.73(3) Å14.240- (2) Å] packing in chains along c which are hexagonally arranged in the ab plane. When the temperature is lowered, no significant changes are found in the molecular structure until a second-order phase transition [Tc = 206(3) K] occurs by doubling the c axis [at T = 123 K a = 15.233(4) Å, c = 28.440(6) Å, space group R3̄]. The major molecular conformational changes related to the phase transition are the rotations of Co(CO)3 and AsPh3 fragments about the 3-fold axes and those of the phenyls about their As-C bond. X-ray studies at 16 different temperatures have been performed in order to describe the details of the small continuous structural changes that occur in the low-temperature phase.
Characterization of the Solid-Solid Phase Transition of Co2(CO)6(AsPh3)2 / P. Macchi, L. Garlaschelli, S. Martinengo, A. Sironi. - In: INORGANIC CHEMISTRY. - ISSN 0020-1669. - 37:24(1998), pp. 6263-6268.
Titolo: | Characterization of the Solid-Solid Phase Transition of Co2(CO)6(AsPh3)2 |
Autori: | MACCHI, PIERO (Primo) GARLASCHELLI, LUIGI (Secondo) SIRONI, ANGELO AGOSTINO DANIELE (Ultimo) |
Settore Scientifico Disciplinare: | Settore CHIM/03 - Chimica Generale e Inorganica |
Data di pubblicazione: | 1998 |
Rivista: | |
Tipologia: | Article (author) |
Appare nelle tipologie: | 01 - Articolo su periodico |