Four Crystalline Forms of (Tetrahydrothiophene)trichloridogold(III): Polymorphism and Reversible Low-temperature Phase Transitions

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• 作者：Daniel Upmann ; Christian Nä ; ther ; Inke Jess and Peter G. Jones
• 刊名：Zeitschrift für anorganische und allgemeine Chemie
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：643
• 期：4
• 页码：311-316
• 全文大小：1040K
• ISSN：1521-3749

文摘

The title compound (tht)AuCl₃, previously known to crystallize at –95 °C in space group C2 with Z = 4 (form I), converts reversibly to form II (P2₁/n, Z = 8) at ca. –150 °C; the b axis doubles and the centering is lost. A few crystals of a rarer form III (Pna2₁, Z = 4) were also investigated; these transform reversibly to form IV (P2₁/c, Z = 4) at ca. –160 °C. In all forms, stacks of molecules are formed, with short Au···Cl contacts within the stacks. For forms I and II, adjacent stacks are connected by C–H···Cl interactions; more striking for forms III/IV are short Cl···Cl contacts between the stacks. Detailed physico-chemical studies of the relationships between the various phases proved to be impossible, largely because form III could not be obtained reproducibly in significant quantities.