5-(3,6-Dibromo-9H-carbazol-9-yl)penta­nenitrile

In the title compound, C17H14Br2N2, the carbazole skeleton is nearly planar [maximum deviation = 0.055 (2) Å]. In the crystal, aromatic π–π stacking is observed between parallel carbazole ring systems of adjacent mol­ecules, the shortest centroid–centroid distance between benzene rings being 3.4769 (11) Å

9-(4-Nitro­phenyl­sulfon­yl)-9H-carbazole

In the title mol­ecule, C18H12N2O4S, the carbazole skeleton is nearly planar [maximum deviation = 0.037 (1) Å] and is oriented at a dihedral angle of 73.73 (5)° with respect to the benzene ring. An intra­molecular C—H⋯O hydrogen bond links a nitro O atom to the carbazole skeleton. In the crystal, inter­molecular C—H⋯O hydrogen bonds link the mol­ecules into a three-dimensional network. π–π contacts between inversion-related benzene rings [centroid–centroid distance = 3.7828 (8) Å] and two weak C—H⋯π inter­actions may also stabilize the structure

9-Benzyl-9H-carbazole

The asymmetric unit of the title compound, C19H15N, contains two crystallographically independent mol­ecules. In both mol­ecules, the planar carbazole moieties [maximum deviations = 0.037 (4) and 0.042 (3) Å] are oriented with respect to the adjacent benzene rings, at dihedral angles of 85.29 (8) and 89.89 (7)°, respectively. In the crystal structure, weak C—H⋯π inter­actions are observed involving the carbazole rings

The Relationship Between the FRAX Tool and Bone Turnover Markers in Postmenopausal Osteoporosis

Aim: In this study, we aimed to show the correlation between the ten-year fracture risk, calculated with FRAX and bone turnover markers (BTM) in a group of postmenopausal women with osteoporosis. Material and Methods: Twenty-four postmenopausal women diagnosed as osteoporosis were included. Patients were assessed for duration of menopause, secondary diseases, medication, habits of nutrition, previous fracture, and family history of fracture. Weight and height measurements were obtained. Bone mineral density (BMD) was measured by dual-energy X-ray absorptiometry (DXA), with a Hologic-QDR 4500 plus device. The ten-year risk for major as well as hip fractures were calculated with the FRAX tool. Serum calcium, phosphorus, magnesium, 25-OH Vitamin D, parathormone (PTH), alkaline phosphatase (ALP), and biochemical markers of bone formation (Osteocalcin, Bone-ALP) and resorption ( N-terminal collagen type 1 and C terminal collagen type 1) were determined. Results: The mean age of patients was 64.3±8.6 (46-80 years). The mean ten-year major fracture and hip fracture risks were 19.5±6.2% and 16.0±5.1%, respectively. There was a strong correlation between the duration of menopause and hip fracture risk (r: 0.878, p=0.022). There was also a strong relationship between hip fracture risk and NTX (r: 0.759, p=0.042). Conclusion: Resorption markers of bone turnover are relevant components in determining fracture risk. Rate of bone remodeling is a parameter which is not included in the FRAX tool. Since FRAX is an established tool for assessing the ten-year fracture risk, we assessed and found a correlation between hip fracture risk and NTX. Further studies, in larger groups of patients need to make clear the impact of BTM in this tool. (Turkish Journal of Osteoporosis 2013;19: 38-41

Synthesis and Electropolymerization of 9-(4-vinylbenzyl)-9H-carbazole on Carbon Fiber Microelectrode: Capacitive Behavior of Poly(9-(4-vinylbenzyl)-9H-carbazole)

The synthesis of 9-(4-vinylbenzyl)-9H-carbazole (VBCz) monomer and surface characterizations of thin film coating of poly(9-(4-vinylbenzyl)-9H-carbazole), P(VBCz) homopolymer on carbon fiber microelectrode (CFME) was performed. Coatings of polymer thin films obtained, with different initial monomer concentrations, were characterized by cyclic voltammetry, scanning electron microscopy and Fourier transform infrared reflectance-attenuated total reflection spectroscopy. Different initial monomer concentrations (1, 3, 5, and 10 mM) were electrodeposited in 0.1 M lithium perchlorate/acetonitrile solution. The characterization of the thin polymer films was performed on the surface of carbon fiber, and composition of polymeric structure was proposed. Capacitor behavior of modified CFME was studied by electrochemical impedance spectroscopy. The deposition charge of polymer growth affected the redox parameters of resulting coated CFME

Synthesis of 9-(4-nitrophenylsulfonyl)-9H-carbazole: Comparison of an impedance study of poly[9-(4-nitrophenylsulfonyl)-9H-carbazole] on gold and carbon fiber microelectrodes

In this study, 9-(4-nitrophenylsulfonyl)-9H-carbazole (NPhSCz) monomer was chemically synthesized. The monomer characterization was performed by Fourier transform infrared spectroscopy, 1H-NMR, and melting point analysis. Two different electropolymerizations of NPhSCz were studied on a gold microelectrode (Au electrode) and carbon fiber microelectrodes (CFMEs) in a 0.1M sodium perchlorate (NaClO4)/acetonitrile solution. The electropolymerization experiments were done from 1 to 4 mM. The characterizations of two different modified electrodes of poly[9-(4-nitrophenylsulfonyl)-9H-carbazole] [poly(NPhSCz)] were performed by various techniques, including cyclic voltammetry, scanning electron microscopyenergy-dispersive X-ray analysis, and electrochemical impedance spectroscopy (EIS). The effects of the initial monomer concentrations (1, 2, 3, and 4 mM) were examined by EIS. The capacitive behaviors of the modified electrodes were defined via Nyquist, Bode magnitude, Bode phase, and admittance plots. The variation of the low-frequency capacitance (CLF) and double-layer capacitance (Cdl) values are presented at different initial monomer concentrations. Poly(NPhSCz)/CFME was more capacitive (CLF = 6.66 F/cm2 and Cdl 28 mF) than the Au electrode (CLF = 6.53 F/cm2 and Cdl 20 mF). An equivalent circuit model of R[QR(CR)(RW)](CR), (R: Current, Q: Constant phase element, C: Double layer capacitance, W: Warburg impedance), was used to fit the theoretical and experimental data. (c) 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 201

Circuit Model Evaluation of Poly(methyl pyrrole-co-2-(9H-carbazole-9-yl)ethyl methacrylate) on Carbon Fiber

Methyl pyrrole (N-MPy) and 2-(9H-carbazole-9-yl) ethyl methacrylate (CzEMA) monomers were electrocopolymerized on carbon fiber microelectrode (CFME) as an active electrode material. The electropolymerization of monomers was studied in 0.1 M sodium perchlorate (NaClO4)/acetonitrile (ACN) solution. The detailed characterization of the resulting electrocoated poly(N-MPy-co-CzEMA)/CFME thin films was studied by various techniques, i.e., cyclic voltammetry (CV), Scanning electron microscopy - Energy Dispersive X-ray analysis (SEM-EDX), and Electrochemical impedance spectroscopy (EIS). The effects of monomer mole fractions (mole fraction, X-CzEMA = n(CzEMA)/n(MPy) + n(CzEMA)) (0.5, 0.66, 0.75, 0.83 and 0.91) during the preparation of modified electrodes were examined by EIS. Capacitive behaviors of modified CFMEs were defined via Nyquist, Bode-magnitude, Bode-phase and Capacitance plots. Circuit model of R(Q(R(C(R(C(RW))))))(CR) was suggested to fit the theoretical and experimental values. The lowest low frequency capacitance value and total charge (Q = 112.9 mC) during electrode-position of polymer thin film by CV method in the mole fraction of X-CzEMA 0.75 (C-LF = similar to 27.2 mF cm(-2)). However, the highest double layer capacitance of polymer/electrolyte system (C-1 = 25.4 mF cm(-2); C-2 = 159.1 mF cm(-2); C-3 = 4.54 mF cm(-2)) was obtained in the same mole fraction.Turkish Scientific Research CouncilTurkiye Bilimsel ve Teknolojik Arastirma Kurumu (TUBITAK) [TUBITAK-110T516]Support from Turkish Scientific Research Council related to a project (TUBITAK-110T516) is acknowledged. We thank Prof. Dr. A. S. Sarac (Department of Chemistry, Polymer Science & Technol., Istanbul Technical University, Istanbul) for usage of Electropol Laboratory facilities

Poly(9H-Carbazole-9-Carbothioic Dithioperoxyanhydride) Formation and Capacitor Study

9H-Carbazole-9-carbothioic dithioperoxyanhydride (2CS(2)Cz) was chemically synthesized in our previous study. In this work, specific (C-sp) and double layer capacitances (C-dl) of the electrocoated poly(9H-carbazole-9-carbothioic dithioperoxyanhydride) P(2CS(2)Cz) films were obtained on glassy carbon electrode (GCE). The polymers were characterized by cyclic voltammetry (CV), Fourier transform infrared reflectance-attenuated total reflection spectroscopy (FTIR-ATR), scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDX), and electrochemical impedance spectroscopy (EIS). Polymer characterizations of FTIR-ATR, and SEM-EDX analysis were taken on carbon fiber microelectrodes (CFMEs). The initial monomer concentration of 2CS(2)Cz was taken as 0.25, 0.5, and 1.0mM in 0.1M sodium perchlorate (NaClO4)/acetonitrile (CH3CN). The capacitance behavior of P(2CS(2)Cz)/GCE is shown by Nyquist, Bode-magnitude, Bode-phase, and Admittance plots relationship. The low frequency capacitance (C-LF=0.52 mFcm(-2)) and double layer capacitance (C-dl=571 mu F) were obtained for [2CS(2)Cz](0)=0.25mM and 1mM, respectively. [GRAPHICS]

Synthesis and application of conducting polymers and their nanocomposites as a corrosion protection performances

Corrosion is explained as metal or alloy changes by chemical or electrochemical process or physical changes because of environmental effects. Corrosion occurs with oxidation and reduction reactions. In this study, Some general informations were given in the introduction section. And then, monomer synthesis, conducting polymers, nanocomposites, copolymers, and applications of corrosion protection performances were examined as a review article in recent papers.Namik Kemal UniversityNamik Kemal UniversityAuthors acknowledges to Namik Kemal University for financial support at 2nd AIOC ICNTC 2016 Conference in Zagreb, Croatia

Carbazole derivative synthesis and their electropolymerization

[No Abstract Available