Aluminium(III) amidinates formed from reactions of 'AlCl' with lithium amidinates

作者：Mayo Dennis H^*; Peng Yang; Zavalij Peter; Bowen Kit H; Eichhorn Bryan W

来源：Acta Crystallographica Section C-Crystal Structure Communications, 2013, 69(10): 1120-+.

DOI：10.1107/S0108270113023135

• crystal structure
• aluminium(III) amidinates
• disorder

The disproportionation of AlCl(THF)(n) (THF is tetrahydrofuran) in the presence of lithium amidinate species gives aluminium(III) amidinate complexes with partial or full chloride substitution. Three aluminium amidinate complexes formed during the reaction between aluminium monochloride and lithium amidinates are presented. The homoleptic complex tris(N,N'-diisopropylbenzimidamido)aluminium(III), [Al(C13H19N2)(3)] or Al{PhC[N(i-Pr)](2)}(3), (I), crystallizes from the same solution as the heteroleptic complex chloridobis(N,N'-diisopropylbenzimidamido)aluminium(III), [Al(C13H19N2)(2)Cl] or Al{PhC[N(i-Pr)](2)}(2)Cl, (II). Both have two crystallographically independent molecules per asymmetric unit (Z' = 2) and (I) shows disorder in four of its N(i-Pr) groups. Changing the ligand substituent to the bulkier cyclohexyl allows the isolation of the partial THF solvate chloridobis(N,N'-dicyclohexylbenzimidamido)aluminium(III) tetrahydrofuran 0.675-solvate, [Al(C19H27N2)(2)Cl]center dot 0.675C(4)H(8)O or Al[PhC(NCy)(2)](2)Cl center dot 0.675THF, (III). Despite having a two-fold rotation axis running through its Al and Cl atoms, (III) has a similar molecular structure to that of (II).

• 出版日期2013-10