The crystal and molecular structure of the tetraethylammonium salt of tetrahydridopentadecacarbonyltetrarhenate(2−) in two crystallographic forms |
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Authors: | Gianfranco Ciani Vincenzo G. Albano Attilio Immirzi |
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Affiliation: | Centro di Studio per la Sintesi e la Struttura dei Composti dei Metalli di Transizione nei bassi Stati di Ossidazione del C.N.R., Istituto di Chimica Generale dell''Università, Via Venezian 21, 20133 Milano Italy;Istituto Chimico ‘G. Ciamician’ dell''Università, Via Selmi 2, 40126 Bologna Italy;Istituto di Chimica delle Macromolecole del C.N.R., Via Corti 12, 20133 Milano Italy |
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Abstract: | The structure of the title compound, (NEt4)2[H4Re4(CO)15], is reported in two crystallographic modifications, I and II. Both forms axe monoclinic and the cell constants are as follows: I, a 11.355(2), b 21.204(4), c 17.416(3) Å, β 94.15(2)°, space group P21/c; II, a 21.831(4), b 17.584(3), c 11.446(2) Å, β 96.02(2)°, space group P21,/n. Two sets of 3042 (I) and 2870 (II) independent diffraction intensities, collected by counter methods, were used for the solution and refinement of the two structures. The final conventional R factors have values 5.5% (I) and 6.3% (II), respectively. The crystal packings are compared, showing different conformations of the (NEt4)+ cations. The anions contain a tetrametal cluster formed by an isosceles triangle plus an apically bound metal atom; the carbonyl groups are all terminally bonded to the rhenium atoms. Some differences, present both in the metal atom clusters and in the carbonyl dispositions, are discussed and compared with a third, previously reported, crystallographic modification of the same compound. |
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Keywords: | To whom correspondence should be addressed. |
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