The characterization of copper 4,4',4'',4'''-Tetrasulfonated phthalocyanine ([29H, 31H-phthalocyanine-2,9,16,23-tetrasulfonato(2-)-N29, N30, N31,N32]copper) and the α-form of copper phthalocyanine ([29H,31H-phthalocyaninato(2-)-N29, N30, N31, N32]copper)

Abstract

Powder X-ray diffraction, e.p.r, and magnetic susceptibility studies on copper 4,4',4'',4'''-tetrasulfonated phthalocyanine, Cu(tspc), and α-copper phthalocyanine, αCu(pc), are reported. Cu(tspc) was found, by analogy with the previously reported structures of the α, β and γ forms of Cu(pc), to have a triclinic unit cell of dimensions a 26.9, b 3.8, c 25.6 �, α 89.9, β 90.0 and γ 95.5�. The e.p.r. and magnetic susceptibility data for both Cu(tspc) and αCu(pc) suggest the presence of exchange interaction. The magnetic susceptibility data are best explained by using an S = � Heisenberg chain model with J -0.84 and -0.71 cm-1 respectively.