The synthesis and spectral properties of amber phthalocyanines
摘要:
Novel antimony(V)-phthalocyanine complexes, [Sb(tObpc)(OH)(2)](+), [Sb(tppc)(OH)(2)](+), and [Sb(tppc)Cl-2](+) (where tObpc and tppc denote tetra(n-butoxy)phthalocyaninate, C48H48N8O42-, and tetrakis(2',6'-dimethylphenoxy)phthalocyaninate, C64H48N8O42-, respectively) were synthesized by oxidizing the corresponding antimony(III) derivatives either with terr-butyl perbenzoate or sulfuryl chloride. The compounds are dissimilar to conventional phthalocyanines in that they are of amber color in solution. Optical properties were studied by absorption and magnetic circular dichroism spectroscopy. The amber color was attributed to a combination of an intense absorption band (Q-band; log(epsilon/M-1 cm(-1)) = ca. 5) at similar to 735-760 nm, which was red-shifted by similar to 1000-1200 cm(-1) to conventional phthalocyanines and a less intense (log(epsilon)= ca. 4) but broad band at similar to 400-500 nm, which is not observed for conventional phthalocyanines. The additional band at similar to 400-500 nm was considered to be a red-shifted Soret band. (C) 2010 Elsevier Ltd. All rights reserved.