Crystal structure of tetrakis[bis(N,N'-dimethylethylenediamido)uranium(IV)], tetrameric globular complex

Autor:	Norman M. Edelstein, Allan Zalkin, David H. Templeton, John G. Reynolds
Rok vydání:	1977
Předmět:	Ligand Inorganic chemistry chemistry.chemical_element Crystal structure Uranium Inorganic Chemistry Pentane Crystallography chemistry.chemical_compound chemistry X-ray crystallography Orthorhombic crystal system Physical and Theoretical Chemistry Group 2 organometallic chemistry Diffractometer
Zdroj:	Inorganic Chemistry. 16:1858-1861
ISSN:	1520-510X 0020-1669
DOI:	10.1021/ic50174a006
Popis:	The tetrameric compound U/sub 4/(CH/sub 3/NCH/sub 2/CH/sub 2/NCH/sub 3/)/sub 8/ is a minor product of the reaction of tetrakis(diethylamido)uranium(IV) with dimethylethylenediamine in pentane. The crystals are orthorhombic, space group Fddd, with a = 12.02 (2) A, b = 22.73 (4) A, and c = 34.32 (6) A; d/sub calcd/ = 2.32 g/cm/sup 3/ for Z = 8. X-ray diffraction intensity data were collected by an automated diffractometer using graphite-monochromated Mo K..cap alpha.. radiation. For 399 reflections with F/sup 2/ greater than 2 sigma, R/sub 1/ = 0.078 and R/sub 2/ = 0.060. Four bis(N,N'-dimethylethylenediamido)uranium(IV) units are connected by bridging nitrogen atoms to form a closed tetrameric complex in which the four uranium atoms are 3.6 A apart at the corners of a twisted square. Each uranium atom is bonded to six nitrogen atoms in a highly distorted trigonal prism. Attached to each uranium atom are two nitrogen atoms from a nonbridging dimethylethylenediamido ligand and four from two bridging ligands.
Databáze:	OpenAIRE
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