where M is a metal or hydrogen; Pc is a phthalocyanine nucleus; each R1 independently is H or an optionally substituted alkyl, aryl, or aralkyl; each L1 independently is a divalent organic linking group; Z is an optionally substituted piperazinyl group; q is 1 or 2; x and y each independently have a value of 0.5 to 3.5; and (x+y) is from 2 to 5; and (G) 800NP.