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.