GB9524028D0 - Substituted porphyrins - Google Patents

Abstract

A compound of general formula (I) wherein R1, R2, R3 and R4 are each independently H, optionally substituted alkyl, optionally substituted alkoxy, optionally substituted alkenyl, optionally substituted alkenyloxy, Si(alkyl)3, halogen, CHO, COOR5, OH, CN, NO2, NO, NR5R6 or formula (II) wherein (A) is optionally substituted aryl or optionally substituted heteroaryl; R5 and R6 are each independently hydrogen, optionally substituted alkyl, optionally substituted alkenyl, optionally substituted aryl, halogen or hydroxy; X, Y, X1, Y2 and Z are each independently H, optionally substituted alkyl, optionally substituted alkoxy, optionally substituted alkyl, optionally substituted alkoxy, optionally substituted alkenyl, optionally substituted alkenyloxy, Si(alkyl)3, halogen, CHO, COOR5, OH, CN, NO2, NO, NR5R6, any adjacent two groups taken together form a-(OCH2CH2)n-group wherein n is 1, 2 or 3, or formula (III) wherein J is a single bond, , CH2O, OCH2, COO, OOC, NHCO, CONH, CH2 or O; Q is H, optionally substituted alkyl, optionally substituted alkoxy, optionally substituted alkenyl, optionally substituted alkenyloxy, Si(alkyl)3, halogen, CHO, COOR5, OH, CN, NO2, NO, NR5R6; (B) is optionally substituted aryl or optionally substituted heteroaryl; provided that at least one of R1, R2, R3 or R4 is selected from formula (II); M is 2H with each of the two nitrogen atoms indicated being bonded to a single hydrogen, or M is a metal atom, metal compound or silicon or a compound of silicon and its uses, particularly in a liquid crystal device, as a reverse saturable absorber, a photodynamic therapy agent and in a biaxial nematic device.