Patent ID: 6911478

Claim:
A compound having the chemical structural linkage as follows: wherein C 2 ˜C 3 means either C 2 —C 3 or C 2 ═C 3 m is 1 or 2 q is 0 or 1 p is 0 or 1 provided that (1) C 2 is tetravalent, and bound to two or more of C 1 , C 3 , N 1 and N 2 ; (2) when p=1, then q=0 and C 2 ˜C 3 means C 2 —C 3 ; or (3) when p=0, and q=1, then C 2 ˜C 3 means either (i) C═C 3 or (ii) C 2 —C 3 where C 2 ˜N 1 means C 2 ═N 1 ; (4) when C 2 ˜C 3 means C 2 —C 3 and q=1 and p=0; wherein C 2 ˜N 1 and C 2 ˜N 2 means