Patent ID: 8153831
Filing Date: 2012-04-10
Classification: C07F,H01L

Abstract:
1. A compound having the formula (L 1 ) y M(L 2 ) z-y wherein M is a Group 5 metal selected from tantalum (Ta), niobium (Nb) or vanadium (V), or a Group 6 metal selected from tungsten (W) or chromium (Cr), L 1 is a substituted anionic 6 electron donor ligand, L 2 is the same or different and is (i) a substituted or unsubstituted anionic 2 electron donor ligand, and at least one of (ii) a substituted or unsubstituted cationic 2 electron donor ligand, and (iii) a substituted or unsubstituted neutral 2 electron donor ligand; y is an integer of 1, and z is the valence of M; and wherein the sum of the oxidation number of M and the electric charges of L 1 and L 2 is equal to 0.