3317-67-7Relevant academic research and scientific papers
BiVO4/cobalt phthalocyanine (CoPc) nanofiber heterostructures: Synthesis, characterization and application in photodegradation of methylene blue
Liu, Guoshuai,Liu, Suwen,Lu, Qifang,Sun, Haiyan,Xiu, Zhiliang
, p. 53402 - 53406 (2014)
BiVO4/cobalt phthalocyanine (CoPc) hierarchical nanostructures were prepared. The structural and photo-chemical properties were characterized using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), scanning electron micr
Effect of Substituents on the Oxidation Potential of Phthalocyanines and Electrocrystallization
Orihashi, Yuji,Nishikawa, Michinori,Ohno, Hiroyuki,Tsuchida, Eishun,Matsuda, Hiro,et al.
, p. 3731 - 3738 (1987)
A series of tetra- or octasubstituted phthalocyaninatocobalt derivatives were prepared and their oxidation behaviors were examined in relation to the nature of substituents.The oxidation potentials of phthalocyanines, especially those of rings were affected by the nature of both substituents and axial ligands.These oxidation potentials were in a linear relation with the Hammett's constants for substituents or axial ligands.The electrocrystallization proceeded when an oxidation potential higher than that for the phthalocyanine ring was given to the solution.This potential shift was therefore revealed to be an important factor to control the electrocrystallization of these phthalocyanines.
Thermal characterization of doped polyaniline and its composites with CoPc
George, Sajan D.,Saravanan,Anantharaman,Venkatachalam,Radhakrishnan,Nampoori,Vallabhan
, p. 235201-1-235201-5 (2004)
Thermal diffusivity of the composites of camphor sulphonic acid (CSA) doped polyaniline (PANI) and its composites with cobalt phthalocyanine (CoPc) has been measured using open cell photoacoustic technique. Analysis of the data shows that the effective thermal diffusivity value can be tuned by varying the relative volume fraction of the constituents. It is seen that polaron assisted heat transfer mechanism is dominant in CSA doped PANI and these composites exhibit a thermal diffusivity value which is intermediate to that of CSA doped PANI and CoPc. The results obtained are correlated with the electrical conductivity and hardness measurements carried out on the samples.
Two-Channel Conductivity and Carrier Crossover in CoxNi1-x(pc)I, Alloys of the Molecular Conductors (Phthalocyaninato)nickel Iodide and (Phthalocyaninato)cobalt Iodide
Liou, Kwangkyoung,Jacobsen, Claus S.,Hoffman, Brian M.
, p. 6616 - 6620 (1989)
Alloys of the isostructural porphyrinic molecular conductors (phthalocyaninato)cobalt iodide, Co(pc)I, and (phthalocyaninato)nickel iodide, Ni(pc)I, of composition CoxNi1-x(pc)I, x = 0.02, 0.10, 0.15, 0.20, 0.33, 0.50, 0.75, 0.90, and 0.95, have been prepared and shown to be homogeneous solid solutions by EPR and energy-dispersive X-ray microprobe analysis.The high (?RT ca. 500 Ω-1 cm-1) metallic conductivity of Ni(pc)I (x = 0) is associated with holes (positive thermopower) created by partial oxidation from the valence ?-band of the pc macrocycle,whereas the lower (?RT ca. 50 Ω-1 cm-1) nonmetallic conductivity of Co(pc)I (x = 1) is associated with electron carriers (negative thermopower) in the partially oxidized dz2 band of the metal-ion spine.For x a maximum appears in the conductivity between 170 and 260 K.This change is attributed to paramagnetic scattering by the Co(2+) local moments.With further increase in x the conductivity continues to change smoothly toward the nonmetallic behavior of Co(pc)I.Surprisingly, the thermopower does not smoothly tend toward the large negative values for Co(pc)I but becomes increasingly positive as x is increased from 0.2 to 0.75 and begins to decrease only by x ca. 0.90.These resultsare interpreted to mean that alloys with 0.2 /ca. x /ca. 0.75-0.9 exhibit two independent conduction channels, hole carriers on the pc macrocycles and electron carriers on the metal-ion spine, and that the site of oxidation shifts progressively from the macrocycle to the metal ion as x is increased.Only by x ca. 0.95 (and T ca. 240 K) does the thermopower become negative, which signifies the crossover point beyond which all charge-transport behavior is determined by the electron carriers on the metal spine rather than the hole carriers on the macrocycle.
Boosting the Capacitive Performance of Cobalt(II) Phthalocyanine by Non-peripheral Octamethyl Substitution for Supercapacitors?
Li, Minzhang,Ramachandran, Rajendran,Wang, Yu,Chen, Qian,Xu, Zong-Xiang
, p. 1265 - 1272 (2021)
In this paper, pristine cobalt(II) phthalocyanine (CoPc) and non-peripheral octamethyl substituted CoPc (N-CoMe2Pc) are the focus of electrochemical investigation. CoPc and N-CoMe2Pc nanorods (NR) were synthesized by a facile precipitation process from sublimated bulk phthalocyanine powders and their electrochemical properties were explored. Due to the large specific surface area, the capacitance performance of the nanorods was significantly higher than that of the sublimated powder sample. N-CoMe2Pc powder exhibited better pseudocapacity compared with CoPc powder and CoPc NR, which is attributed to enhanced charge transfer rate and improved redox activity after the introduction of octamethyl substituents on phthalocyanine ring. The maximum specific capacitance value was achieved by N-CoMe2Pc NR based electrode, exhibiting 210.2 F g–1 capacitance at 5 mV s–1 scan rate and 156.1 F g–1 at 0.25 A g-1 current density, and also showing high efficiency and satisfactory retention. These results indicate that according to proper molecular design, N-CoMe2Pc NR could be applied as the potential candidate for electrode material in supercapacitors.
Preparation of Cobalt/Sulfur/Graphite Electrocatalyst for Oxygen Reduction from Efficient Two-Electron Pathway
Mohammadian,Seyyedi,Sehatnia
, p. 1672 - 1680 (2019)
Abstract—: Graphite, the most stable carbon allotrope, is widely used for various applications due to its interesting properties. In the present work, graphite surface has been partially oxidized by concentrated hydrochloric acid (37%); then, the graphite oxide surface has been modified by a low-temperature method using sulfur and cobalt atoms to obtain a Co–S–GC catalyst. The current density passing through Co–S–GC catalyst has been higher than that passing through graphite. The novel cobalt-based catalyst has been demonstrated good performance for oxygen reduction reaction (ORR) due to the unique bio-inspired structure. The number of electrons transferred for ORR vary from 2.17 to 2.41 in a wide range of over-potentials indicating an effective 2-electron pathway form O2 to H2O2. The Tafel slope (≈30 mV dec–1) indicates significant amount of cobalt oxide on the surface of the catalyst. The catalyst durability test displays a negative shift of only 11.7 mV after 10 000 cycles for its half-wave potential (E1/2).
X-ray structures and homolysis of some alkylcobalt(III) phthalocyanine complexes
Galezowski, Wlodzimierz,Kubicki, Maciej
, p. 9902 - 9913 (2005)
The first crystallographic data for σ-bonded alkylcobalt(III) phthalocyanine complexes are reported. A single-crystal X-ray structure of CH3CH2CoIIIPc (Pc = dianion of phthalocyanine) reveals that the solid consists of centrosymmetric face-to-face dimers in which the CH3CH2CoIIIPc units retain their square pyramidal geometry. The structure appears to be the first one reported for a five-coordinate RCo(III)(chelate) complex with an electron-deficient equatorial system. The Co-C bond in CH3CH2CoIIIPc (2.031(5) A) is the longest found in five-coordinate RCo III(chel) complexes (R = simple primary alkyl group). Another X-ray study demonstrates that CH3CoIIIPc(py) has a distorted octahedral geometry with axial bonds of very similar length to those in methylcobalamin. The axial bonds are shorter than those in its octaethylporphyrin analogue, in accordance with a weaker trans axial influence in six-coordinate complexes containing an electron-deficient phthalocyanine equatorial ligand. A different trend has been observed for five-coordinate RCoIII(chel) complexes: electron-rich equatorial systems seem to make the Co-C axial bond shorter. Kinetic data for the homolysis of RCo IIIPc complexes (R = Me, Et) in dimethylacetamide are also reported. Homolysis of ethyl derivatives is faster. The Co-C bond dissociation energies (BDEs) for the pyridine adducts of the methyl and the ethyl derivative are 30 ± 1 and 29 ± 1 kcal/mol, respectively. The BDE for CH 3CoPc(py) is considerably lower than that for MeCbl despite the very similar lengths of the axial bonds in the two complexes. The results of this work do not support any correlation between the Co-C bond length and the bond strength as defined by BDE.
Spontaneous solution-phase redox deposition of a dense cobalt(II) phthalocyanine monolayer on gold
Mazur, Ursula,Leonetti, Maya,English, William A.,Hipps
, p. 17003 - 17006 (2004)
A dense monolayer of cobalt(II) phthalocyanine, CoPc, can be formed on a gold surface by spontaneous redox deposition followed by vacuum annealing at about 110?°C. CsCoPc(CN)2 or KCoPc(CN)2 in dilute (a??10-6 M) ethanol solution rapidly forms a dense adlayer that, when washed with ethanol, can be imaged by scanning tunneling microscopy, STM, in air. This adlayer is converted to a monolayer of CoPc by vacuum annealing as confirmed by STM and X-ray photoelectron spectroscopy (XPS). This spontaneous surface redox adsorption process represents a novel method for depositing metallorganic complexes, which are ultimately only physisorbed on gold.
Large-scale production of graphene by microwave synthesis and rapid cooling
Xu, Zhanwei,Li, Hejun,Li, Wei,Cao, Gaoxiang,Zhang, Qinglin,Li, Kezhi,Fu, Qiangang,Wang, Jie
, p. 1166 - 1168 (2011)
Graphene was prepared via carbonization of microwave synthesized metal phthalocyanine, followed by a rapid cooling process. The morphology and structure of the obtained graphene were controlled by the coolants.
Development of a perchlorate sensor based on Co-phthalocyanine derivative by impedance spectroscopy measurements
Braik,Dridi,Ali,Abbas,Ben Ali,Errachid
, p. 77 - 86 (2015)
In this work, we have prepared a perchlorate sensor based on cobalt phthalocyanine derivative molecules. The membrane was deposited onto gold substrates using dip-coating method. Adhesion and morphological properties have been studied using contact angle measurements. Then, the sensitivity, the detection range and the detection limit were determined using electrochemical impedance spectroscopy (EIS) measurements. The sensor was also studied specificity towards interfering ions nitrate (NO3-), carbonate (CO32-) and sulfate (SO42-) to show the specificity of the membrane. The impedance behavior of the perchlorate sensor (gold/membrane) has been modeled by an equivalent electrical circuit using a modified Randles model for better understanding the phenomena present at the interface membrane/electrolyte.
