Coordination of alane and aluminum alkyls to the N-donor atom of side chain functionalized cyclopentadienyl iron and nickel complexes; structure of {[(C5H5)(C5H4CH2NMe2)]Fe}2AlH3
摘要:
The synthesis of iron and nickel complexes with interaction of alane and trialkylaluminum compounds to the amino group is described. Treatment of [2-(N,N-dimethylamino)methyl] ferrocene [(C5H5)(C5H4CH2NMe2)] Fe (1) with trimethylaminealane (H-3-Al-NMe3), leads to the formation of the iron alane complex {[(C5H5)(C5H4CH2NMe2)]Fe}(2)AlH3 (2), with a five-coordinated aluminum center. The structure of 2 has been determined by single-crystal X-ray diffraction. The reaction of FeCl2 with two equivalents of {(C5H4CH2CH2NMe2)Li} leads to the formation of [(C5H4CH2CH2NMe2)(2)Fe] (3). Complex 3 reacts quantitatively with two equivalents of trimethylaluminum to the compound [(C5H4CH2CH2NMe2)(2)Fe](AlMe3)(2) (4). Addition of trimethylaluminum or triethylaluminum to the nickel complex [(C5H4CH2CH2NMe2)(2)Ni]Ni (5) give the paramagnetic nickel aluminum compounds [(C5H4CH2CH2NMe2)(2)Ni](AlMe3)(2) (6a) and [(C5H4CH2CH2NMe2)(2)Ni](AlEt3)(2) (6b), respectively. These compounds were characterized by H-1, C-13 and Al-27 NMR, elemental analysis and mass spectroscopy. Studies to deposit intermetallic thin films using these compounds as bimetallic single source precursors revealed that aluminum was deposited, only. (C) 1997 Elsevier Science S.A.