Patent ID: 6894161

Claim:
A photosensitizer compound represented by one of the following formulas wherein one, or both, of R 1 and R 4 has, or have, the structure of wherein n is an integer from 0 to 6 wherein M is a metal selected from Co, Ni(II), Cu(II), Zn(II), Fe(III), Sn, Ge, Si, Ga, Al, Mn(III), Gd(III), In and Tc; R 2 , R 5 and R 6 are independently hydrogen, a lower alkyl group; a lower alkyl carboxylic acid or a salt, amide, ester or acylhydrazone thereof; a carboxylic acid ester (or carbalkoxy) group (2-6C); hydroxy; nitro; amino; sulfonyl; or —CONR 7 CO— where R 7 is aryl (6-10C); or alkyl (1-6C); and each R 3 is independently hydrogen; hydroxy; a lower alkyl carboxylic acid or a salt, amide, ester or acylhydrazone thereof; nitro; amino; a carboxylic acid ester (or carbalkoxy) group (2-6C); sulfonyl; or aryl (6-10C).