Syntheses of Liquid Crystalline Phthalocyanines

Discotic mesomorphism of 2,3,7,8,12,13,17,18-octakis (alkyl-thio) 5,10,15,20 tetraaza porphyrin and its complexes with some divalent transition metal ions Synthesis and characterization

“…Cup6 and NiP6 seemingly show both mesophases; these are connected by a phase transition, presumably of second order (CuP6) or very weak first order (NiP6) but easily detected by polarizing microscopy because of sharp texture changes. Except for H2P (7)(8)(9)(10)(11)(12), all of the compounds are mesogenic; a few of them exhibit mesomorphic polymorphism. Melting (C-+D) temperatures range between 40 and 85°C.…”

Liquid crystalline metal phthalocyanines: Structural organization on the substrate surface

“…Since 1982 when Piechocki and co-workers [20] synthesized the first mesogenic phthalocyanines the mesophase structure of a significant number of substituted phthalocyanines and porphyrins were investigated [34]. These include phthalocyanines with eight linear alkyl [35], alkoxymethyl [36,37] and alkoxy [37][38][39] substituents which demonstrated transitions from the crystalline phases to the mesophases at elevated temperatures. Various MPcs with different substituents were synthesized, however, structure and properties of thin film of a small number of these LC phthalocyanines were reported.…”

“…Table 7 Figure 7 Mesomorphic lead phthalocyanines (PbPc) offer an intriguing and very promising class of compounds. The first nesomorphic PbPc was synthesised in 1987 [36,69]. Alkoxymethyl substituted phthalocyaninato lead(II) complexes (PbPcR 8 , R= -CH 2 OC n H 2n+1 ; n= 8, 12) gave a stable Col h mesophase even at room temperature.…”

Fabrication and Efficient Acidichromism of Langmuir-Blodgett Films of Azo Group-Modified Phthalocyanines

“…Phthalocyanines (Pcs) are an important class of pigments that have fascinated scientists for many years because of their applications in various disciplines 1 . A wide range of methods have recently been reported for modifying the supramolecular architecture of aggregated dyes such as the symmetrical phthalocyanines in both solutions and thin films formation [2][3][4][5][6][7][8] . Langmuir-Blodgett (LB) thin film deposition or solution casting strategies are made possible by side chain modifications 8 .…”