Die Kristall- und Molekülstrukturen von π-C7Η7Μο(CO)2Cl und π-C7H7Mo(CO)2Br / The Crystal Structures of π-C7Η7Μο(CO)2Cl and π-C7H7Mo(CO)2Br
1975 ◽
Vol 30
(1-2)
◽
pp. 26-29
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The structures of the title compounds have been determined from three dimensional X-ray data by Patterson and Fourier methods. The crystals of both are orthorombic with the space group D42-P 212121. The chloride (2) and the bromide (3) are isomorphous, they have unit cell dimensions a = 642,76 pm, b =1187,27 pm, c =1311,14 pm (2) and 644,59 pm, 1183,78 pm, c = 1321,83 pm (3) and Z = 4. Least squares refinement by use of 1179 (2) and 1037 (3) independent reflections measured on a diffractometer has reached R = 12,5% and R = 7,4% respectively. The molybdenum-bromine bond in 3 is relatively shorter than the molybdenum-chlorine bond in 2, due to greater dπ-dπ interaction.
1975 ◽
Vol 30
(9-10)
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pp. 699-709
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