Enthalpies of formation of M(¿-C5H5)2L complexes (M = Mo, W, Ti; L = C6H4O2, C10H6O2, C14H8O2)

• Type: Article in International Scientific Journal
• Date: 1988

Authors

riberio da silva, mav (Author) Other; das dores, m (Author) FCUP; ribeiro da silva, mc (Author) Other; dias, ar (Author) Other

Journal

Title: Journal of Organometallic Chemistry

Vol. 345

Pages: 105-115

ISSN: 0022-328X

Publisher: Elsevier

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Other information

Authenticus ID: P-00H-5ZZ

DOI: 10.1016/0022-328x(88)80239-0

Abstract (EN): The standard molar enthalpies of formation, at 298.15 K, of five crystalline bent metallocenes, [M(¿-C5H5)2L] (M = Mo, W, Ti) (LH2 = 1,2-benzenediol, C6H4-(OH)2; 2,3-napthalenediol, C10H6(OH)2; 9,10-phenanthrenediol, C14H8(OH)2), have been derived from enthalpies of hydrolyses in acid solution measured by precision solution-reaction calorimetry. The results were: ¿Hf° [Mo(¿-C5H5)2(O26H4),c] = -130.6±2.9, ¿Hf°[Mo(¿-C5H5)2(O2C10H6),c] = -80.3± 2.2, ¿Hf° [ Mo(¿-C5H5)2(O2C14H8,c] = -53.25 ± 10.4, ¿Hf° [ W(¿-C5H5)2 (O2C6H4),c] = -112.8 ±2.9, ¿Hf° [Ti(¿-C5H5)2(O2C14H8),c] = -322.6 ± 12.7 kJ mol-1. The metaloxygen bond strengths were evaluated as mean bond enthalpy terms (E). Comparison with corresponding values in similar comlexes reveals that small steric energy arises from the binding of a catechol type ligand to a metal atom. © 1988.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 11