ISSN:
0009-2940
Keywords:
Hexacoordination
;
Silicon compounds
;
Germanium compounds
;
Tin compounds
;
Phosphanylmethanide ligands
;
Chemistry
;
Inorganic Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
The dimethyl group-14 element dihalides Me2EX2 (E = Si, Ge, Sn; X = Cl or Br) react with two equivalents of Li[C(P-Me2)2(SiMe3)] to give the cis-hexacoordinated complexes Me2E[C(PMe2)2 (SiMe3)]2 (E = Si: 2a, E = Ge: 2b, E = Sn: 2c), which were characterized spectroscopically and by means of X-ray structure determinations. Whereas 2a and 2b are isotypic and crystallize in the space group P21/c, 2c crystallizes in the space group C2/c with crystallographic C2(2) molecular symmetry. In all cases the diphosphanylmethanide ligands bind in an unisobidentate fashion. For compound 2c, this still can be attributed to the trans influence of the methyl group, but in 2a and 2b clearly borderline cases between hexa- and tetracoordination are found. Compound 2b (E = Ge) is much more on the side of tetracoordination than 2a, thus underlining the importance of small polarity differences for the actual coordination number achieved in compounds with relatively unpolar bonds.
Additional Material:
2 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/cber.19961290705
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