Bridged Phthalocyanine Systems for Sensitization of Nanocrystalline TiO₂Films

Abstract

Phthalocyanines based-dyes represent attractive alternatives to the expensive and polluting pyridyl based Ru complexes because of their photochemical and thermal stability, they do show in fact intense absorption in the UV/blue (Soret band) and the red/near IR (Q band) spectral regions and appear very promising as sensitizer dyes for DSSC. In this contribution we review the state of the art and the recent progress in the application of these materials as dyes for DSSC and present three new dyes which are bridged derivatives of Iron phthalocyanine. Synthesis, optical properties, electrochemical characterization and device performances are discussed with regard to the different substitution degree of the macrocycle.

Iodine doping of substituted μ-carbido iron diphthalocyanines

“…IR Preparation of hemisubstituted μ-carbido bridged iron phthalocyanine (t-Bu) 4 PcFe-C-FePc (1) and amphisubstituted μ-carbido bridged iron phthalocyanine [(t-Bu) 4 PcFe] 2 C (2). The procedures followed were already reported in [10]. 1.…”

“…Having recently reported the synthesis of hemi and amphi-substituted μ-carbido bridged iron phthalocyanine [10], we present here new results and a thorough description of the work concerning the oxidation of these analogous with iodine and their properties in relationship to the substituents on the macrocycle.…”

Photophysical Processes Occurring in a Zn-phthalocyanine in Ethanol Solution and on TiO2 Nanostructures

“…In the last few years the significant improvement in the synthesis of Ph-and Pc-based compound with the required lightharvesting properties, have brought to very interesting results: porphyrin YD2-o-C8 has reached an efficiency value of 12% with a Co II /Co III -based electrolyte, further increased up to ca13% when employed in a cocktail with a metal free dye 15,16 and thus comparable to those reached with the Ru-polypyridyl dyes 9,12 .…”

“…9 Furthermore, the chemical tunability through substituent addition on the periphery of the macrocycle allows to prevent the aggregation 9,11,12,17 , which would be favoured by the more extended π-conjugation with respect to porphyrins 12 . However, the control over the formation of 4 aggregates remains an open problem, and the photochemical activity of these compounds is still unsatisfactory, despite the remarkable improvement obtained in the last years.…”

Isonicotinic acid-ligated cobalt (II) phthalocyanine-modified titania as photocatalyst for benzene degradation via fluorescent lamp

“…The axial ligation of CoPc allows enhancement of the electronic capabilities of the complex and functionalize the complex to be used for molecular design. In the study, isonicotinic acid was used because of its rigidity due to the pyridine ring and its assembly to TiO2 via its carboxylic acid moiety, a common functionality that provides attachments to metal oxides 13 . The slight improvement in the photocatalytic degradation therefore may be attributed to the isonicotinic acid acting as a bridging ligand to both the cobalt (II) and the titanium in the surface of TiO2, as shown in Fig.…”