Side chain polysiloxanes with phthalocyanine moieties

Abstract

Side chain polysiloxane with 5-(pentyloxy)-3-methyloxy-9,10,16,17,23,24-hexakis(octenyloxy)phthalocyanine moieties is synthesized by hydrosilylation reaction. The phase behavior and thermooptical properties of the polysiloxane and starting 2-(pent-4-enyloxy)-3-methyloxy-9,10,16,17,23,24-hexakis(octenyloxy)phthalocyanine is examined by POM (Polarizing optical microscopy), TOA (thermooptical analysis), DSC (differential scanning calorimetry), AFM (atomic force microscopy) and SAXS (small angle X-ray scattering) studies. The effect of the attachment of phthalocyanine to polysiloxane chains over phase transitions and phase morphology is discussed in details

Kinetic model for the molecular system of Zinc(II)-2,9,16,23-phthalocyanine tetracarboxylate

“…It has the general spectra feature as those of other MPcs. [1][2][3][4][5][6][7] Compared to metal-free phthalocyanines, absorption spectrum of ZnPc(COONa) 4 consists of Soret band located in the blue region (positioned at B 1 = 341 nm and B 2 = 279 nm) and pronounced splitting of the Q bands (positioned at Q 1 = 691 nm and Q 2 = 641 nm). For unsubstituted ZnPc molecule in DMSO, Q maximum of the band is located at 673 nm.…”

“…34 Since the aggregated molecule is generally photoinactive, aggregation is not desired in MPcs. 1,5,6 Compared with the peripherally substituted MPcs, the nonperipherally substituted MPcs are less aggregated. 34 Further, it was shown that aggregation can reduce NLO properties of pthalocyanines.…”

Synthesis and thermotropic behavior of side chain polysiloxane bearing triphenylene moiety

“…In addition to measurements obtained from differential scanning calorimetry (DSC) analysis, the phase transitions of (4) and (6) were independently studied by means of thermooptical analysis (TOA). The TOA experiments rely on the registration of intensity of polarized light and change of texture with temperature [23,29]. Changes of the transmission of polarized light as function of temperature were recorded.…”

“…Side chain polymers based on discotic mesogens have been much less explored and it concerns in particular systems based on flexible, linear polysiloxanes with triphenylene moieties. Only a limited number of star shaped oligomers [12,19,20] and side chain systems [21][22][23] has been explored so far, although these polymers may also have an increased tendency to form columnar mesophases which might help to obtain thin layers with high molecular order.…”

“…Moreover, it was already proven that such polymers have a tendency to lower the crystal-mesophase temperature transition of discotic and calamitic mesophases [23].…”