69934-86-7Relevant articles and documents
Cobalt phthalocyanine tetracarboxylic acid modified reduced graphene oxide: A sensitive matrix for the electrocatalytic detection of peroxynitrite and hydrogen peroxide
Hosu, Ioana S.,Wang, Qian,Vasilescu, Alina,Peteu, Serban F.,Raditoiu, Valentin,Railian, Svetlana,Zaitsev, Vladimir,Turcheniuk, Kostiantyn,Wang,Li, Musen,Boukherroub, Rabah,Szunerits, Sabine
, p. 1474 - 1484 (2015)
The quantification of peroxynitrite (ONOO-, PON) and hydrogen peroxide (H2O2) is intrinsically difficult as both species show similar oxidative features located within a narrow potential. The sub-second lifetime of ONOO- at neutral pH further complicates the analysis. In this paper, we examine the electrocatalytic activity of cobalt phthalocyanine tetracarboxylic acid (CoPc-COOH) loaded reduced graphene oxide (rGO) films towards peroxynitrite and hydrogen peroxide detection. The rGO/CoPc-COOH matrix is synthesized by the reaction of graphene oxide (GO) and CoPc-COOH at 90 °C for 5 h under ultrasonication. The integration of CoPc-COOH and the reduction of GO to rGO was confirmed by X-ray photoelectron spectroscopy, FTIR, Raman, UV-vis spectroscopy and electrochemistry. The rGO/CoPc-COOH film showed high electrocatalytic activity and specificity for ONOO- at anodic potential with a sensitivity of ≈11.5 ± 1 nA nM-1 and a peroxynitrite detection limit of ≈1.7 nM. The rGO/CoPc-COOH films further exhibited electrocatalytic reduction of H2O2 with a sensitivity of 14.5 μA mM-1 and a detection limit of ≈60 μM for H2O2. This journal is
Nanomolar detection of 4-aminophenol using amperometric sensor based on a novel phthalocyanine
Nemakal, Manjunatha,Aralekallu, Shambhulinga,Mohammed, Imadadulla,Pari, Malathesh,Venugopala Reddy,Sannegowda, Lokesh Koodlur
, p. 342 - 353 (2019/06/25)
Novel cobalt (II) tetra-β-[N(2-(1,3-benzothiazole))carboxamide] phthalocyanine (CoTBTCAPc) has been synthesized for the first time. The dark green colored complex was characterized by different physicochemical and analytical techniques. Cyclic voltammetric studies revealed that the synthesized complex is redox-active nature. The CoTBTCAPc modified glassy carbon electrode (GCE/CoTBTCAPc) showed a stagnant charge transfer behavior for the redox probe whereas, composite hybrid of CoTBTCAPc with carbon nanoparticles (CNP) coated on GCE (GCE/CNP-CoTBTCAPc) showed facile and better charge transfer compared to the bare GCE. The GCE/CoTBTCAPc and GCE/CNP-CoTBTCAPc fabricated electrodes exhibited a decrease in over potential with the increase in oxidation peak current. Electrochemical oxidation of 4-aminophenol (4-AP) at nanomolar concentration was obtained in phosphate buffer pH 7.0 electrolytic media. The modified electrodes showed linear electrochemical response in the concentration range of 40–800 nM and the detection limit (LOD) was found as 13 and 11 nM (S/N = 3) for GCE/CoTBTCAPc and GCE/CNP-CoTBTCAPc electrodes respectively. Differential pulse voltammetric (DPV) technique showed linear response for the 4-AP oxidation in the concentration range of 100–1000 nM with sensitivity of 0.0328 and 0.4179 μA nM?1 cm?2 for the phthalocyanine and CNP-phthalocyanine modified electrodes respectively. In contrast, the amperometric sensor displayed linear response in the concentration range of 100–900 nM with sensitivity values of 0.4008 and 0.8887 μA nM?1 cm?2 and LOD of 40 and 30 nM for GCE/CoTBTCAPc and GCE/CNP-CoTBTCAPc electrodes respectively. The GCE/CNP-CoTBTCAPc showed selectivity for 4-AP even in the presence of interfering organic and inorganic species. This stable and simple sensor offers an opportunity for the electrochemical sensing of 4-aminophenol in real sample analysis like 4-AP in paracetamol tablets.
Improved Synthesis of Soluble Metal-Free/Metal Phthalocyanine Tetracarboxylic Acids and Their Application in the Catalytic Epoxidation of Cyclohexene
Sun, Xiaoling,Wang, Li,Tan, Zhi
, p. 1094 - 1102 (2015/08/04)
Soluble metal-free and metal (copper (II), iron (III), and cobalt (II)) phthalocyanine tetracarboxylic acids (5-8) were synthesized using a novel method consisting of improved hydrolysis based on the diazo reaction. The obtained compounds (5-8) were characterized by X-ray diffraction, UV-Vis spectrometry, and FT-IR spectrometry and then utilized as catalysts for the epoxidation of cyclohexene with molecular oxygen as oxidant. Reaction conditions including reaction time, temperature, catalyst amount, and isobutyraldehyde/cyclohexene ratio were optimized to achieve the highest selectivity of cyclohexene oxide. Metal-free phthalocyanine tetracarboxylic acid (5) and metal (copper (II), iron (III), and cobalt (II)) phthalocyanine tetracarboxylic acids (6-8, respectively) were compared. Complexes 6-8 exhibited higher catalytic activity than compound 5 under the optimal conditions. Graphical Abstract: Four soluble metal-free and metal PTCs were synthesized using a novel method, and were utilized as catalysts for the epoxidation of cyclohexene with molecular oxygen as the oxidant. A total of 58.1% selectivity and yield of cyclohexene oxide were achieved under the optimal condition. [Figure not available: see fulltext.]
