Patent ID: 6841676

Claim:
A compound having the formula L 1 [MQ 1 Q 2 ]L 2 in which M is a metal selected from the group consisting of Nb, Ta, Mo, W, Mn and Re, Q 1 and Q 2 are each a univalent substitutent, and L 1 and L 2 are ligands coordinated to M, wherein one of L 1 and L 2 contains a first coordinating atom that is a nitrogen atom contained within a C═N group, and a second coordinating atom that is either a second nitrogen atom, optionally present in a second C═N group, or an oxygen, sulfur or phosphorus atom, and the other of L 1 and L 2 contains a first coordinating atom that is a nitrogen atom contained within a C═N group, and a second coordinating atom that is either a second nitrogen atom, optionally present in a second C═N group, or a sulfur or phosphorus atom.