J. Molecular Structure, 1028, 222-226 (2012).pdf (original) (raw)
Related papers
2018
Department of Chemistry, Inorganic Chemistry Section, Jadavpur University, Kolkata-700 032, India <em>E</em>-<em>mail:</em> crsjuchem@gmail.com <em>Fax:</em> 91-33-24146584 <em>Manuscript received 16 July 2018, accepted 26 July 2018</em> 5-(Pyridin-3-yldiazenyl)quinolin-8-ol (HL) acts as anionic bidentate N,O-chelator to synthesize the complexes of composition [ML<sub>2</sub>(H<sub>2</sub>O)<sub>2</sub>] (M = Mn<sup>II</sup>, Co<sup>II</sup>, Cu<sup>II</sup>) and [M<sup>/</sup>L<sub>2</sub>] (M<sup>/</sup> = Ni<sup>II</sup> and Zn<sup>II</sup>). The complexes have been characterized by spectroscopic data. The molecular structure of [MnL<sub>2</sub>(H<sub>2</sub>O)<sub>2</sub>] has been confirmed by single crystal X-ray crystallography. Magnetic (bulk and EPR) properties ...
Synthesis and characterization of 2-quinoxalinol Schiff-base metal complexes
Inorganica Chimica Acta, 2009
The reaction of uranyl acetate with (2,2 0 -(1E,1 0 E)-(2-benzyl-3-hydroxyquinoxaline-6,7-diyl)bis(azan-1-yl-1-ylidene)bis(methan-1-yl-1-ylidene) diphenol) (H 2 L1) at room temperature in methanol and chloroform yields the UO 2 L1 complex. Crystals were grown through solvent diffusion of the ligand-metal complex in dimethyl formamide with diethyl ether to prepare: UO 2 L1 Á DMF (1). Complexes with 2,2 0 -(1E,1 0 E)-(2-benzyl-3-hydroxyquinoxaline-6,7-diyl)bis(azan-1-yl-1-ylidene)bis(methan-1-yl-1-ylidene)-dibenzene-1,4-diol (H 2 L2) and 2,2 0 -(1E,1 0 E)-(2-hydroxy-3-isopropylquinoxaline-6,7-diyl)bis(azan-1-yl-1-ylidene)bis(methan-1-yl-1-ylidene)diphenol (H 2 L3) were also prepared, and crystals of the uranyl complexes (UO 2 L2 Á DMF and ) grown from DMF/ether. A fourth complex UO 2 L4 Á H 2 O (4) was prepared through layering a solution of the tetra-tert-butyl substituted 2-quinoxalinol salen ligand H 2 L4 in acetone with an aqueous solution containing uranyl acetate. The complexes exhibit a symmetric core featuring a slightly distorted bicapped pentagonal geometry around the uranium center with two oxo-groups and two imine groups from the ligand chelating the ligand and the fifth site in the coordination plane of the ligand occupied by a solvent molecule. These compounds have been characterized using solution (NMR and UV-Vis) and solid-state (IR, X-ray crystallography) techniques. Complexes of H 2 L4 with early transition metals; Mn 2+ , Co 2+ , Ni 2+ , and Cu 2+ are also prepared and characterized for comparison of solution and spectroscopic characteristics.
Dalton transactions (Cambridge, England : 2003), 2011
Conventional reactions of the versatile multidentate ligand 5-methyl-1,2,4-triazolo[1,5-a]pyrimidin-7(4H)-one (HmtpO) with metallic(II) salts lead to three novel multidimensional complexes [Cu(HmtpO)(2)(H(2)O)(3)](ClO(4))(2)·H(2)O (1), {[Cu(HmtpO)(2)(H(2)O)(2)](ClO(4))(2)·2HmtpO}(n) (2) and {[Co(HmtpO)(H(2)O)(3)](ClO(4))(2)·2H(2)O}(n) (3). In each compound, the triazolopyrimidine ligand shows a different and unusual coordination mode, giving rise to structures with diverse topologies and dimensionality. Compound 1 is a monomeric complex, in which HmtpO shows both N3-monodentate and N1,O71-bidentate modes. 2 is a bidimensional framework with the ligand showing a N3,O71 bidentate-bridging mode. The structure of 3 consists of 1D chains, in which HmtpO displays a N1,N3,O71-tridentate-bridging mode. It should be noted that these coordination modes of the HmtpO ligand are unique in the case of compounds 2 and 3. On the other hand, the magnetic properties of the polynuclear complexes 2 and...
IOSR Journal of Applied Chemistry, 2017
The series of Co (II), Ni (II) and Cu(II) metal complexes quinolin-8-yl (1,3-benzoxazol-2ylsulfanyl)acetate (BZ) have been synthesized. All the complexes thoroughly characterized by different physicochemical and spectroscopic techniques (UV-Vis, IR, NMR and ESI-Mass). The powder XRD indicates the crystalline state and morphology of Ni (II) and Cu (II) metal complexes, the thermal stability of the metal complexes as been performed. In the current study, the synthesized compounds were evaluated for their antioxidant activity by using DPPH assay, Cu (II) metal complex exhibited higher antioxidant activity almost close to the standard BHT. In addition, antioxidant activity is correlated with docking interactions of human antioxidant enzyme receptor with the competitive inhibitor DTT (PDB: 3MNG), which showed greater binding interactions with metal complexes. The antimicrobial studies has been carried out against different bacterial and fungal strains and the results showed that metal complexes be more active than the ligand BZ.
Acta Crystallographica Section E Crystallographic Communications
Structural analyses of the compounds di-μ-acetato-κ4 O:O′-bis{[2-methoxy-N,N-bis(quinolin-2-ylmethyl)ethanamine-κ4 N,N′,N′′,O]manganese(II)} bis(tetraphenylborate) dichloromethane 1.45-solvate, [Mn2(C23O2)2(C23H23N3O)2](C24H20B)·1.45CH2Cl2 or [Mn(DQMEA)(μ-OAc)2Mn(DQMEA)](BPh4)2·1.45CH2Cl2 or [1](BPh4)2·1.45CH2Cl2, and (acetato-κO)[2-hydroxy-N,N-bis(quinolin-2-ylmethyl)ethanamine-κ4 N,N′,N′′,O](methanol-κO)manganese(II) tetraphenylborate methanol monosolvate, [Mn(CH3COO)(C22H21N3O)(CH3OH)](C24H20B)·CH3OH or [Mn(DQEA)(OAc)(CH3OH)]BPh4·CH3OH or [2]BPh4·CH3OH, by single-crystal X-ray diffraction reveal distinct differences in the geometry of coordination of the tripodal DQEA and DQMEA ligands to MnII ions. In the asymmetric unit, compound [1](BPh4)2·(CH2Cl2)1.45 crystallizes as a dimer in which each manganese(II) center is coordinated by the central amine nitrogen, the nitrogen atom of each quinoline group, and the methoxy-oxygen of the tetradentate DQMEA ligand, and two bridging-acetat...
Chinese Chemical Letters, 2011
Synthesis and biological study of novel 5-{(4-(6,7-dihydrothieno-[3,2-c]pyridin-5(4H)-ylsulfonyl)phenylamino)-methyl} quinolin-8-ol and its metal complexes Abstract A novel 5-((4-(6,7-dihydrothieno[3,2-c]pyridin-5(4H)-ylsulfonyl)phenylamino)methyl)quinolin-8-ol (HTPSMQol) was synthesized by optimized reaction of 4-(6,7-dihydrothieno[3,2-c]pyridin-5(4H)-ylsulfonyl)aniline with 5-chloromethyl-8-hydroxy quinoline hydrochloride (CMHQ). Also complexes of HTPSMQol were prepared by using various M (II) metal salts. All compounds were analyzed by spectroscopic techniques and screened against various strains of microorganisms. The results showed higher antimicrobial activity of HTPSMQol compared to its metal complexes and comparable with Ciprofloxacin. The chemistry of 8HQs has drawn considerable attention due to the biological properties [1] like antiamoebic [2], antimalarial [3], anticancer [4], antileishmanial [5] and antifungal efficiency [6]
2020
A new family of ferrocenylated P^N ligands where the nitrogen donor is either of an imine or amine (secondary/tertiary), was synthesized. The condensation reaction between diphenylphosphino propylamine and formyl ferrocene led to the formation of imine ligand [(η5-C5H5)Fe{(η5-C5H4)CH=N-(CH2)3-PPh2)}] (1), which on reduction with NaBH4 gave secondary amine ligand [(η5-C5H5)Fe{(η5-C5H4)CH2-NH-(CH2)3-PPh2)}] (2). Additionally, nucleophilic substitution reaction of diphenylphosphino ethyl/propyl amine with [FcCH2NMe3+][I−] salt leads to tertiary-amine ligand [(η5-C5H5)Fe(η5-C5H4)CH2]2-N-(R-PPh2) where R= C2H4 (3) and C3H6 (4). The newly synthesized ferrocenylated ligands were then complexed with Pd(II) giving [cis(κ2-P^N)PdCl2] type complexes (5-8), where imine, secondary amine, and tertiary amine ligands act as a bidentate ligand. The molecular structures of ligand (3), and complexes (5), (6), and (7) have also been determined by X-ray crystallography. In the molecular structures of th...
CHEMICAL & PHARMACEUTICAL BULLETIN, 2001
New polymeric complexes of Cu(II), Co(II), Ni(II) and UO 2 (II) with 5-(2 1 -carboxyphenylazo)-8-hydroxyquinoline (LH 2 ) have been prepared and characterized on the basis of analytical, magnetic, 1 H NMR, EPR and electronic spectral studies. Tentative structures for the polymeric complexes are proposed. The important infrared (IR) bands and the main 1 H NMR signals are assigned and discussed relative to the molecular structure. EPR spectrum of copper(II) complex has been studied with a view to assigning their stereochemistries. Various EPR parameters have been calculated. Each metal has six-coordinates in an octahedral environment. The ligand acts as a dibasic (bis-bidentate chelating agent coordinating through CN, N=N, COOH and OH groups by replacement of a proton from the two latter groups. Considerable interest has also been focused on the synthesis of the azo compounds and its polymeric metal complex due to its wide potential applications. The thermal decomposition behavior of the complexes is also discussed. ଝ This article has been abstracted from the M.Sc. thesis of M.A. Hussien. (A.Z. El-Sonbati).