Metal–carbonyl and metal–nitrosyl complexes. Part XIII. X-Ray study of the molecular structures of π-cyclopentadienyl- and π-(methylcyclopentadienyl)-trans-iododicarbonyl(trimethyl phosphite) molybdenum
- 1 January 1972
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc., Dalton Trans.
- No. 17,p. 1900-1903
- https://doi.org/10.1039/dt9720001900
Abstract
The molecular geometries of π-cyclopentadienyl- and π-(methylcyclopentadienyl)-trans-iododicarbonyl(trimethyl phosphite) molybdenum [(I) and (II)] have been determined by X-ray crystal-structure analysis. The Mo-P distances [2·406(9) and 2·388(8)Å] are significantly shorter than in π-cyclopentadienyl-trans-iododicarbonyl(triphenylphosphine)molybdenum (III)[2·481(5)Å], whereas the Mo-l distances [2·836(4) and 2·850(3)Å in (I) and (II); 2·858(3)Å in (III)] are essentially constant. Both (I) and (II) crystallize in the orthorhombic space group p212121, with Z= 4 in unit cells of dimensions : (I), a= 10·75, b= 16·60, c= 8·57 (all ± 0·01)Å; (II), a= 16·317(6), b= 11·323(3), c= 8·740(2)Å. Photographic data were used for (I) and diffractometer data for (II). The structures were solved by Patterson and Fourier methods and refined by least squares to R 7·8%[(I), 906 reflections] and 5·9%[(II), 1847 reflections].Keywords
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