Spectroelectrochemical characterization and controlled potential chronocoulometric demetallation of tetra- and octa-substituted lead phthalocyanines

Synthesis, electrochemistry and in situ spectroelectrochemistry of water-soluble phthalocyanines

“…Moreover, the shoulder of Q-band at 638 nm decreases in intensity, while the B-band intensity at 312 nm increases slightly. The bands at 438 and 468 nm and shifting of the Q-band indicate the formation of the [Co(I)Pc(-2)] 1-species, confirming the CV assignment of couple III to [Co(II) Pc(-2)]/[Co(I)Pc(-2)] 1-couple [50][51][52][53][54][55][56]. Decrease in the broadening of the Q-band and observation of split bands at 438 and 468 nm shows the aggregation-disaggregation equilibrium of the species.…”

“…The in situ UV-Vis changes of 4 during constant applied potentials of the redox processes, as a representative of the complexes having ring-based redox processes, are seen in (Fig. 5c) [50][51][52][53][54][55]. This process occurred with clear isosbestic points at 296, 332, 402, 593 and 710 nm in the spectra.…”

“…This process gave clear isosbestic points at 284, 343, 576 and 696 nm in the spectra and a color changes from blue to dark blue. Decreasing of the Q-band without a shift and observation of the bands between 500 and 600 nm are typical of a ligand-based oxidation in cobalt Pc complexes [50][51][52][53][54][55].…”

L shell X-ray fluorescence parameters of Pb in phthalocyanine complexes

“…Dinçer et al (2005) described the synthesis of novel lead phthalocyanines carrying chloro or alkyylthio and alkylmalonyl at periphery. The radius of divalent lead ions is greater than the radius of the inner core of the phthalocyanine ring, so the metal ion does not fit inside the central cavity but it lies above the phthalocyanine plane (Koca et al, 2006). Therefore these complexes could show anomalous redox behavior.…”

“…The phthalocyanine complexes of the first transition elements such as Co þ 2 , Ni þ 2 , Cu þ 2 , Zn þ 2 (Doğan et al 2014) show the moderately hard-hard interaction. The spectroscopic and electrochemical properties of phthalocyanines can be altered by changing the central atom and substituents on to the peripheral and nonperipheral positions of phthalocyanine macrocycle (Koca et al 2006, Koçak et al 1994, 2000. Dinçer et al (2005) described the synthesis of novel lead phthalocyanines carrying chloro or alkyylthio and alkylmalonyl at periphery.…”