Bidentate and unidentate formato ligands in dicarbonylbis(formato)bis(triethylphosphine)molybdenum

Autor:	Douglas C. Brower, Paul B. Winston, T. L. Tonker, Joseph L. Templeton
Rok vydání:	1986
Předmět:	Diketone Denticity Stereochemistry Acetylacetone Crystal structure Inorganic Chemistry chemistry.chemical_compound Crystallography chemistry X-ray crystallography Carboxylate Physical and Theoretical Chemistry Monoclinic crystal system Group 2 organometallic chemistry
Zdroj:	Inorganic Chemistry. 25:2883-2888
ISSN:	1520-510X 0020-1669
Popis:	Syntheses and spectroscopic properties of complexes of the type M(CO)/sub 2/L/sub 2/(B-B)Y are presented (M = Mo, W; L = PEt/sub 3/, PPh/sub 3/; B-B = acetylacetonate (acac), 1,1,1,5,5,5-hexafluoroacetylacetonate (facfac), tropolonate (trop), carboxylate; Y = Cl, Br, O/sub 2/CR). These products are derived from M(CO)/sub 3/L/sub 2/X/sub 2/ reagents (X = Cl, Br). The x-ray diffraction structure of one member of this series, Mo(CO)/sub 2/(PEt/sub 3/)/sub 2/(OOCH)/sub 2/ (2), is described. The molecule crystallizes in the monoclinic space group P2/sub 1//n with a = 12.691 (8) A, b = 12.250 (9) A, c = 13.813 (12) A, ..beta.. = 90.85 (6)/sup 0/, and Z = 4. The structure was solved from 3410 reflections with 1 > 3..cap alpha..(I), with weighted and unweighted residuals of 5.4 and 4.1%, respectively. The formato ligands engage in different binding modes in the solid state. These ligands exchange unidentate and bidentate coordination modes rapidly in solution with an activation barrier too small to be readily measured by variable-temperature NMR techniques. 26 references, 1 figure, 7 tables.
Databáze:	OpenAIRE
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