A5002371569- Vanadium and Halogenation Chemistry
- Metal complexes synthesis and properties
- Metal-Catalyzed Oxygenation Mechanisms
- Organic Electronics and Photovoltaics
- Porphyrin and Phthalocyanine Chemistry
- Free Radicals and Antioxidants
- Conducting polymers and applications
- Transition Metal Oxide Nanomaterials
- Semiconductor materials and interfaces
- Gas Sensing Nanomaterials and Sensors
- Molecular Junctions and Nanostructures
- Polyoxometalates: Synthesis and Applications
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Photonic and Optical Devices
- Enzyme function and inhibition
- Analytical Chemistry and Sensors
- Cassava research and cyanide
- Thin-Film Transistor Technologies
- Chemical Reaction Mechanisms
- Nitric Oxide and Endothelin Effects
- Crystal structures of chemical compounds
- Crystallography and molecular interactions
- Asymmetric Hydrogenation and Catalysis
- Advanced Memory and Neural Computing
Qatar University
2014-2022
St. Cloud State University
2004-2016
Colorado State University
1995-2007
Johns Hopkins University
1992-2001
Indian Institute of Technology Madras
2001
National Institute of Standards and Technology
1997
University at Albany, State University of New York
1992-1993
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTX-ray Structure of (NH4)6(Gly-Gly)2V10O28.cntdot.4H2O: Model Studies for Polyoxometalate-Protein InteractionsDebbie C. Crans, Mohammad Mahroof-Tahir, Oren P. Anderson, and Mary M. MillerCite this: Inorg. Chem. 1994, 33, 24, 5586–5590Publication Date (Print):November 1, 1994Publication History Published online1 May 2002Published inissue 1 November 1994https://pubs.acs.org/doi/10.1021/ic00102a036https://doi.org/10.1021/ic00102a036research-articleACS...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReactions of dioxygen (O2) with mononuclear copper(I) complexes: temperature-dependent formation peroxo- or oxo- (and dihydroxo-) bridged dicopper(II) complexesIndrajit Sanyal, Mohammad Mahroof-Tahir, M. Sarwar Nasir, Phalguni Ghosh, Brett I. Cohen, Yilma Gultneh, Richard W. Cruse, Amjad Farooq, Kenneth D. Karlin, and Cite this: Inorg. Chem. 1992, 31, 21, 4322–4332Publication Date (Print):October 1, 1992Publication History Published online1 May...
A mononuclear vanadium(IV), a vanadium(V), and binuclear mixed valence vanadium(IV/V) complex with the ligand N-(2-hydroxyethyl)iminodiacetic acid (H3hida) have been structurally characterized. Crystal data for [VO(Hhida)(H2O)]·CH3OH (1): orthorhombic; P212121; = 6.940(2), b 9.745(3), c 18.539(4) Å; Z 4. Na[V(O)2(Hhida)2]·4H2O (2): monoclinic; P21/c; 6.333(2), 18.796(2), 11.5040(10) β 102.53(2)°; (NH4)[V2(O)2(μ-O)(Hhida)2]·H2O (3): C2/c; 18.880(2), 7.395(2), 16.010(2) 106.33(2)°; The...
The design, synthesis, and characterization of binuclear copper(I) complexes investigations their dioxygen reactivities are interest in understanding fundamental aspects copper/O2 reactivity modeling copper enzyme active-site chemistry. In the latter regard, unsymmetrical systems interest. Here, we describe chemistry new complexes, starting with binucleating ligand UN2-H, possessing a m-xylyl moiety linking bis[2-(2-pyridyl)ethyl]amine (PY2) tridentate chelator...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFacile amide hydrolysis effected by dinuclear copper complexesNarasimha N. Murthy, Mohammad Mahroof-Tahir, and Kenneth D. KarlinCite this: J. Am. Chem. Soc. 1993, 115, 22, 10404–10405Publication Date (Print):November 1, 1993Publication History Published online1 May 2002Published inissue 1 November 1993https://pubs.acs.org/doi/10.1021/ja00075a084https://doi.org/10.1021/ja00075a084research-articleACS PublicationsRequest reuse permissionsArticle...
This study focused on the synthesis and characterization of hydrazide ligands their respective Pd(II) complexes used high throughput screening to determine α-glucosidase carbonic anhydrase II enzyme inhibition activities. The physical, analytical (elemental analyses for C, H, N Pd) spectral (FT-IR, 1H NMR, 13C EI-mass) techniques utilized during revealed formation square planar, neutral 1:2 Pd(II)-hydrazide with general formula [PdL2Cl2]. In these complexes, are monodentate; terminal...
Abstract Vanadium plays an important role in biological systems and exhibits a variety of bioactivities. In effort to uncover the chemistry biochemistry vanadium with nitrogen‐ oxygen‐containing ligands, we report herein synthesis spectroscopic characterization vanadium(IV) complexes hydrazide ligands. Substituents on these ligands exhibit systematic variations electronic steric factors. Elemental spectral data indicate presence dimeric unit two ions coordinated along H 2 O molecules. The...
The studies of an underexplored synthetic reagent, VO(2)(acac) (Hacac = acetylacetone) and semirational strategies for the formation a complete series simple vanadium(V) alkoxide clusters in alcohol-containing solvents. neutral mono-, di-, tri-, tetranuclear oxovanadium(V) complexes [V(2)O(2)(&mgr;-OCH(3))(2)(acac)(2)(OCH(3))(2)] (1), [V(4)O(4)(&mgr;-O)(2)(&mgr;-OCH(3))(2)(&mgr;(3)-OCH(3))(2)(acac)(2)(OCH(3))(2)].2CH(3)CN (2),...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNew thermally stable hydroperoxo- and peroxo-copper complexesMohammad Mahroof-Tahir, Narasappa Narasimha Murthy, Kenneth D. Karlin, Ninian J. Blackburn, Shahid N. Shaikh, Jon ZubietaCite this: Inorg. Chem. 1992, 31, 14, 3001–3003Publication Date (Print):July 1, 1992Publication History Published online1 May 2002Published inissue 1 July 1992https://pubs.acs.org/doi/10.1021/ic00040a003https://doi.org/10.1021/ic00040a003research-articleACS...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA dinuclear mixed-valence Cu(I)/Cu(II) complex and its reversible reactions with dioxygen: generation of a superoxodicopper(II) speciesMohammad Mahroof-Tahir Kenneth D. KarlinCite this: J. Am. Chem. Soc. 1992, 114, 19, 7599–7601Publication Date (Print):September 1, 1992Publication History Published online1 May 2002Published inissue 1 September 1992https://pubs.acs.org/doi/10.1021/ja00045a064https://doi.org/10.1021/ja00045a064research-articleACS...
The synthesis, spectroscopic, enzyme-inhibition, and free-radical-scavenging properties of a series vanadium(IV) complexes, compounds 1-10, were investigated. These complexes exhibit dimeric structure with hydrazide ligands coordinated in bidentate fashion. All are stable the solid state, but varying degrees stability solution. In coordinating solvent such as DMSO, stepwise binding two molecules at 6th positions trans to V double bond O unit is observed. converted monomeric species which...
The solution properties of two isomeric forms the V−EDDA complex (the symmetric α-cis and asymmetric β-cis) have been studied using multinuclear NMR spectroscopy. isomerization constant aqueous equilibrium mixture expressed as [α-cis]/[β-cis] increased on addition organic solvents (methanol, formamide, DMSO) decreased salts (NaCl, NaClO4, NH4Cl). corresponding thermodynamic parameters were determined under a variety conditions. studies consistent with interpretation that solvation is major...
Oxovanadium(IV) -derived antifungals have been prepared by condensing equimolar amounts of vanadyl sulfate with hydrazides. All the synthesized ligands and their metal complexes were characterized IR, UV–Visible micro analytical data. These compounds screened for antifungal activity against Aspergillus flavus (A. flavus), Trichophyton longifusus (T. longifusus), Candida albicans (C. albicans), Microsporum canis (M. canis), Fusarium solani (F. solani) glaberata glaberata) fungal strains....
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure of the Dimeric Ethylene Glycol-Vanadate Complex and Other 1,2-Diol-Vanadate Complexes in Aqueous Solution: Vanadate-Derived Transition-State Analog PhosphotransferasesW. J. Ray Jr., D. C. Crans, Zheng, W. Burgner II, H. Deng, M. Mahroof-TahirCite this: Am. Chem. Soc. 1995, 117, 22, 6015–6026Publication Date (Print):June 1, 1995Publication History Published online1 May 2002Published inissue 1 June...
A vanadium complex (VO2(3-fl)) and CNT composite film based temperature sensor is reported in this study. Surface-type silver electrodes were deposited on the glass substrates. thin of VO2(3-fl) was coated as a temperature-sensing material top pre-patterned Ag electrodes. The principle conductivity change sensing element upon heating or cooling processes. DC AC (100 Hz) resistances decreased quasilinearly with increasing range 25–80 °C. overall resistance decreases by 1.8–2.1 1.9–2.0 times...
A novel surface-type nonvolatile electric memory elements based on organic semiconductors CuPc and H2Pc are fabricated by vacuum deposition of the films preliminary deposited metallic (Ag Cu) electrodes. The gap between Ag Cu electrodes is 30–40 μm. For current–voltage (I–V) characteristics effect, switching negative differential resistance regions observed. mechanism attributed to electric-field-induced charge transfer. As a result device switches from low high-conductivity state then back...
Spectroscopic, enzyme-inhibition, and free-radical scavenging properties of a series hydrazide ligands their vanadium(IV) complexes have been investigated. Analytical spectral data indicate the presence dimeric unit with two oxovanadium(IV) ions (VO2+) coordinated along water molecules. All are stable in solid state, but exhibit varying degrees stability solution. Binding coordinating solvent such as DMSO is indicated at 6th position vanadium followed by conversion to monomeric intermediate...
This paper reports the experimental results for humidity dependent properties of an organic field effect transistor. The transistor was fabricated on thoroughly cleaned glass substrate, in which junction between metal gate and channel plays role dielectric. Thin films semiconductor copper phthalocynanine (CuPc) semitransparent Al were deposited sequence by vacuum thermal evaporation substrate with preliminarily Ag source drain electrodes. output transfer characteristics device performed....
Vanadium oxoions have been shown to elicit a wide range of effects in biological systems, including an increase the quantity phosphorylated proteins. This response has attributed inhibition protein phosphatases, indirect activation kinases via stimulation enzymes at early steps signal transduction pathways and/or direct kinases. We evaluated latter possibility by exploring vanadate, decavanadate and vanadyl cation species on activity cAMP-dependent kinase (PKA), serine/threonine kinase....