Two crystal forms of cis-bis(ethylamine) dichloro platinum(II)


Тип публикации: статья из журнала

Год издания: 2011

Идентификатор DOI: 10.1016/j.molstruc.2010.12.009

Ключевые слова: Platinum(II), Coordination compounds, X-ray crystal structure solution, IR- and H-1, C-13, N-15 MAS NMR spectroscopy's, 13C, 15N MAS NMR spectroscopy's, IR- and 1H, <sup>13</sup>C, IR- and <sup>1</sup>H, MAS-NMR spectroscopy, Conformations, Dimethylformamide, Hydrochloric acid, Molecules, Nuclear magnetic resonance spectroscopy, Platinum, Pyrolysis, Reaction kinetics, Recrystallization (metallurgy), X ray powder diffraction, X rays, Crystal atomic structure

Аннотация: Cis-bis(ethylamine) dichloro platinum(II) (form A) was prepared by a reaction of K2PtCl4 with CH3CH2NH2*HCl and CH3COOK. Form B was obtained from A after recrystallization from a solution of dimethylformamide in HCl. Ab initio crystal structure determination was carried out for both forms using X-ray powder diffraction techniques. Показать полностьюThe forms A and B are rather similar from the structural point of view. The crystal structures consist of discrete asymmetric molecules with a platinum atom in the planar coordination. Ethyl groups orient towards both sides of the platinum coordination plane. The molecules are packed in layers. Form A differs from B by a smaller cell volume by c.a. 51 angstrom(3). The observed distinction is the result of molecular conformations. IR- and H-1, C-13, N-15 MAS NMR spectroscopy's support the differences in ethylamine conformation for both forms. Thermal decomposition begins for form A at 180 degrees C whereas for form B it is 10 degrees C higher, resulting in the formation of Pt metal. The interpretation based on structural features supposes that the acidic media during the recrystallization suppresses hydrogen (Cl center dot center dot center dot H-N) bonding within cis-[Pt(CH3CH2NH2)(2)Cl-2] molecules and causes more extensive intermolecular H-bonding which results in bigger volume and higher thermal stability. (C) 2010 Elsevier B.V. All rights reserved.

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Выпуск журнала: Vol. 987, Is. 1-3

Номера страниц: 152-157

ISSN журнала: 00222860

Место издания: AMSTERDAM