Synthesis, characterization and electrochemical properties of novel β 7-oxy-4-(4-methoxyphenyl)-8-methylcoumarin substituted metal-free, Zn(II) and Co(II) phthalocyanines

Electrical and gas sensing properties of novel cobalt(II), copper(II), manganese(III) phthalocyanines carrying ethyl 7-oxy-4,8-dimethylcoumarin-3-propanoate moieties

“…The solubility can be increased by introducing alkyl, alkoxy or long ester chain groups into the periphery or non-periphery positions of the phthalocyanine framework. The preparation of phthalocyanines with monohydroxycoumarins has been reported in several papers and their different properties, such as photophysical, photochemical, electrochemical and spectroelectrochemical, have been investigated [22][23][24][25][26][27][28][29]. In this paper, the combination of ethyl 7-hydroxy-4,8-dimethylcoumarin-3-propanoate and 3-nitrophthalonitrile (1) functional groups into a single hybrid compound, ethyl 7-(2,3-dicyanophenoxy)-4,8-dimethylcoumarin-3-propanoate (2) via nucleophilic aromatic substitution reaction is performed, and this time coumarin is substituted with ethyl propanoate in the 3-position of three lactone ring, and the corresponding Co(II), Cu(II) and Mn(III) phthalocyanines bearing ethyl 7-oxy-4,8-dimethylcoumarin-3-propanoate groups were prepared.…”

Four transition metal complexes constructed with mixed mercaptotetrazole and 4,4′-bipyridine ligands

“…As the scan rate is increased to 80 and 100 mV s -1 , the anodic peak appears at 0.479 and 0.567 V, respectively. Again, no corresponding cathodic wave was observed, showing that the electrochemical behavior of the Zn(II)/Zn(I) redox couple is irreversible [30].…”

Novel peripherally and non-peripherally 6-oxyflavone substituted metal-free, zinc(II) and cobalt(II) phthalocyanines: Electrochemical and in situ spectroelectrochemical properties

“…Figure 4b-4d represents UV-vis spectral changes observed during the redox processes of 6 in DMSO/ TBAP and a simultaneously recorded chromaticity diagram. Aggregation in MPc complexes are typified by a broadened or split Q band, with the high energy band being owing to the aggregate and the low energy band due to the monomer [28,29]. Thus, the original spectrum with cyan color monitored before the application of any constant potential reflects clearly the presence of an equilibrium between the aggregated and monomer species in the solution at first (Fig.…”