Carbosilane dendrimers containing complexes N,N′-pyridylimine of molybdenum and platinum at their periphery
摘要:
Pyridylimine ligands of general formula CS-{O-4-(2,5-C6H2R2)-N=CH-2-Py}(n), where CS is a trimethylsilyl group (n = 1, R = H, Ia or Me, Ib) or a carbosilane dendritic framework (IIa,b, n = 4; IIIa, n = 8), have been coordinated to platinum(II) and molybdenum(O) centers to give the mononuclear [(Ia,b){PtCl2}], tetranuclear [(IIb){PtCl2}(4)] and [(IIb){Mo(CO)(3)(MeCN)}(4)], and octanuclear [(IIIa) {Mo(CO)(3)(MeCN)}(8)] complexes. The poor solubility of the polymetallic platinum compounds impedes the preparation of higher-generation dendrimers, although such a limitation is not found in the case of the more soluble molybdenum dendrimers. (C) 2007 Elsevier B.V. All rights reserved.