Patent ID: 6683175
Filing Date: 2004-01-27
Classification: G03G

Abstract:
A 5,10,15,20-tetrapyridyl-21H,23Hporphyrinato-zinc compound having a crystal form selected from the group consisting of (a), (b) and (c) shown below:(a) a crystal form characterized by peaks at Bragg angles (2&thgr;Â±0.2 deg.) of 9.4 deg., 14.2 deg. and 22.2 deg., (b) a crystal form characterized by peaks at Bragg angles (2&thgr;Â±0.2 deg.) of 7.0 deg., 10.5 deg. and 22.4 deg., and (c) a crystal form characterized by peaks at Bragg angles (2&thgr;+0.2 deg.) of 7.4 deg., 10.2 deg and 18.3 deg., respectively in CuK&agr;-characteristic X-ray diffraction patterns.