COORDINATION COMPLEX

摘要

The present invention provides a complex of formula (I) wherein M is Ca, Mg, Ba or Sr; L1 is selected from R1O, R2S, R3R4N, R5R6P, a substituted or unsubstituted cyclopentadienide, and a substituted or unsubstituted pyrazolyl group, where R1−6 are each independently H or hydrocarbyl; L2 is selected from R7R8O, R7R8S, R7R8R9N, R7R8C=NR9, PR7R8R9, and a substituted or unsubstituted heterocycle containing one or more O, N or S atoms, Where R7−9 are each independently H or a hydrocarbyl group; or L1 and L2 are linked to form a bidentate ligand; L3 is absent or is a solvent molecule, or a neutral ligand as defined for L2 , wherein L3 may be the same or different to L2; or L3 is linked to a further metal center ; or L1, L2 and L3 are linked to form a tridentate ligand; and X is an alkyl group , an aryl group, an aryloxide, an amide group, or an enolate group of formula R10 R11C=CR12O− , wherein R10−12 are each independently H or hydrocarbyl; with the proviso that when L1 and L2 are {HC(C(CH3 )=N−2,6−iPr2C6H 3 )2} and M is magnesium , X is other than Me or tBu.