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1.
《Journal of Coordination Chemistry》2012,65(16):1505-1512
The reactions of the tetradentate amine-phenol type Schiff bases H2sal2en (1,2-ethylenebis(salicylideneimine) and H2sal2mp (1,2-benzylenebis(salicylideneimine)) with trans-[ReOCl3(PPh3)2] or (n-Bu4N)[ReOCl4] in air gave the products (µ-O)[ReO(sal2en)]2 (1) and [ReOCl(sal2mp)] (2), respectively. X-ray and spectroscopic studies have shown that 1 contains the linear O=Re–O–Re=O grouping, with the four donor atoms of sal2en2? coordinating in the square plane cis to the oxo ions. In 2, a cis oxo-chloro arrangement is observed with a phenolic oxygen being coordinated trans to the oxo group. The terminal Re=O bond lengths in 1 and 2 are 1.709(4) and 1.683(3)?Å, respectively. 相似文献
2.
The reactions of the potentially tridentate Schiff bases 2-[(2-hydroxyphenyl)iminomethyl]phenol (H2ono) and 2-(2-aminobenzylideneimino)phenol (H3onn) with trans-[ReOBr3(PPh3)2] were studied, and the complexes [ReIIIBr(PPh3)2(ono)] (1) and [ReVBr(PPh3)2(onn)]Br (2) were isolated. In 1ono acts as a dianionic tridentate ligand, and in 2onn is coordinated as a tridentate trianionic imido-imino-phenolate. The complex [ReI(CO)3(ons)(Hno)] was isolated from the reaction of [Re(CO)5Br] with 2-[(2-methylthio)benzylideneimino]phenol (Hons; Hno = 2-aminophenol), with ons coordinated as a bidentate chelate with a free SCH3 group. These complexes were characterized by X-ray crystallography, NMR and IR spectroscopy. 相似文献
3.
《Journal of Coordination Chemistry》2012,65(11):1913-1920
Two series of zinc(II) complexes of two Schiff bases (H2L1 and H2L2) formulated as [Zn(HL1/HL2)]ClO4 (1a and 1b) and [Zn(L1/L2)] (2a and 2b), where H2L1 = 1,8-bis(salicylideneamino)-3,6-dithiaoctane and H2L2 = 1,9-bis(salicylideneamino)-3,7-dithianonane, have been prepared and isolated in pure form by changing the chemical environment. Elemental, spectral, and other physicochemical results characterize the complexes. A single crystal X-ray diffraction study confirms the structure of [Zn(HL1)]ClO4 (1a). In 1a, zinc(II) has a distorted octahedral environment with a ZnO2N2S2 chromophore. 相似文献
4.
《Journal of Coordination Chemistry》2012,65(3):554-563
Equimolar reactions of Ph n M(OPr i )2 (where M?=?As and Sb) with Schiff bases [OHC6H4CH=N(R)OH] in benzene solution yield organoarsenic and -antimony derivatives, (where M?=?As and Sb; n?=?1 and 3; R?=?–CH2CH(CH3)–, –(CH2)3–, –(CH2)2–, and –C(CH3)2CH2–). All these derivatives have been characterized by elemental analyses and molecular weight measurements, and structures have been proposed on the basis of IR, NMR (1H and 13C), and FAB-mass studies. Schiff bases and their corresponding organoantimony derivatives have been screened for antimicrobial activity against Aspergillus flavus (fungus) and Escherichia coli (bacteria). 相似文献
5.
《Journal of Coordination Chemistry》2012,65(6):1094-1106
Pyrazolone derivatives (Z)-4-((2-hydroxyethylimino)(p-tolyl)methyl)-3-methyl-1-phenyl-1H-pyrazol-5(4H)-one [PMP-EA] (1), (Z)-1-(3-chlorophenyl)-4-((2-hydroxyethylimino)(p-tolyl)methyl)-3-methyl-1H-pyrazol-5(4H)-one [MCPMP-EA] (2), and (Z)-4-((2-hydroxyethylimino)(p-tolyl)methyl)-3-methyl-1-p-tolyl-1H-pyrazol-5(4H)-one [PTPMP-EA] (3) have been synthesized and characterized. The molecular geometry of 2 has been determined by single-crystal X-ray study. These ligands exist in amine-one tautomeric form in the solid state. Three copper(II) complexes, [Cu(PMP-EA)(H2O)2] (4), [Cu(MCPMP-EA)(H2O)2] (5), and [Cu(PTPMP-EA)(H2O)2] (6), respectively, have been synthesized using these ligands and characterized by microanalytical data, molar conductivity, IR, UV–Visible, FAB-Mass, magnetic measurement, TG-DTA studies, and ESR spectral studies; Cu(II) is five-coordinated with [ML(H2O)2] composition. The interaction of the complexes with CT-DNA (calfthymus) was investigated using different methods. The results suggest that the copper complexes bind to DNA via intercalation and can quench the fluorescence intensity of EB bound to DNA. 相似文献
6.
The seven-coordinate rhenium(III) complex cation [ReIII(dhp)(PPh3)2]+ was isolated as the iodide salt from the reaction of cis-[RevO2I(PPh3)2] with 2,6-bis(2-hydroxyphenyliminomethyl)pyridine (H2dhp) in ethanol. In the complex fac-[Re(CO)3(H2dhp)Br], prepared from [Re(CO)5Br] and H2dhp in toluene, the H2dhp ligand acts as a neutral bidentate N,N-donor chelate. The complexes were characterized by elemental analysis, infrared and 1H NMR spectroscopy and X-ray crystallography. 相似文献
7.
A series of Cp2Ti(SB)Cl complexes, whereSB is the anion of bidentate Schiff bases derived from salicylaldehyde and different primary aminesviz o-anisidine,m-anisidine,o-phenetidine,o-chloroaniline,m-chloroaniline,m-nitroaniline, α-naphthylamine and benzylamine, have been synthesised by the reaction of dichloro-bis(cyclopentadienyl) titanium(IV),
Cp2TiCl2, and bidentate Schiff base (sbh) in a 1:1 molar ratio in refluxingthf in the presence of triethylamine. The new derivatives have been characterised on the basis of their elemental analyses, conductance
measurements and spectral (IR,1Hnmr and electronic) studies 相似文献
8.
New hexa-coordinated Ru(II) complexes of the type [RuCl2(DMSO)2(diamine)] (diamine = o-phenylenediamine and ethylenediamine) have been prepared by reacting cis-[RuCl2(DMSO)4] with Schiff bases (H2sal-en, 1; H2nap-en, 2; H2sal-o-pdn, 3; H2nap-o-pdn, 4) in a 1:1 ratio. The ligands, which were expected to act as tetradentate (N2O2) chelates under the normal reaction conditions, were found to undergo hydrolytic cleavage to form the diamine and the corresponding aldehyde. All the complexes have been characterized by analytical and spectroscopic (IR, electronic and1H NMR) data. Single-crystal X-ray analysis of the complex [RuCl2(DMSO)2(o-pndn)] revealed that the coordination environment around the ruthenium metal consists of a N2S2Cl2 octahedron. 相似文献
9.
The syntheses, structural and spectroscopic characterization of the complexes of general formula [ReL(CO)3Cl] bearing bifunctional hydrazone Schiff base ligand L are presented in this paper. The structure of one of the complexes is determined by X-ray crystallography. The solid-state structure of the compound is involved in a secondary interaction in lattice forming a supramolecular array. The gas phase geometry optimization and electronic calculation have been performed using density functional theory without any symmetry constraints. On the basis of structural and theoretical studies, ligand in the complexes is considered to be in the keto, not in enol form. Experimental ground state IR and NMR data set agree with those calculated by DFT calculations. The electronic spectra of the complexes are calculated by time dependent density functional theory (TDDFT) using conductor like polarizable continuum model (CPCM). The computed vertical excitation energies in solution are in good agreement with experimental one showing that the metal-to-ligand charge transfer transitions in visible region dominate over ligand based ILCT transition. The TDDFT excited states calculation of the electronic spectra in solution provides evidence towards luminescence spectra. 相似文献
10.
Raji Raveendran 《Journal of organometallic chemistry》2007,692(4):824-830
Ortho-metallated ruthenium(III) complexes with Schiff bases (H2L) derived from one mole equivalent each of benzaldehyde and acid hydrazides are described. Reactions of H2L with [Ru(PPh3)3Cl2] in presence of NEt3 (1:1:2 mole ratio) under aerobic conditions in methanol provide the complexes having the general formula trans-[Ru(L)(PPh3)2Cl] in 55-60% yields. The complexes have been characterized with the help of elemental analysis, magnetic susceptibility, electrochemical and various spectroscopic (infrared, electronic and EPR) measurements. The +3 oxidation state of the metal centre in these complexes is confirmed by their one-electron paramagnetic nature. Molecular structures of two representative complexes have been determined by X-ray crystallography. In each complex, the metal ion is in a distorted octahedral CNOClP2 coordination sphere. The dianionic C,N,O-donor ligand (L2−) together with the chloride form a CNOCl square-plane and the P-atoms of the two PPh3 molecules occupy the two axial sites. The electronic spectra of the complexes in dichloromethane solutions display several absorptions due to ligand-to-metal charge transfer and ligand centred transitions. In dichloromethane solutions, the complexes display a ruthenium(III) → ruthenium(IV) oxidation in the potential range 0.35-0.98 V (vs. Ag/AgCl). All the complexes in frozen (110 K) dichloromethane-toluene (1:1) solutions display rhombic EPR spectra. 相似文献
11.
《Journal of Coordination Chemistry》2012,65(15):2746-2760
Oxovanadium(IV)-Schiff-base complexes, [VOL2] {L?=?N,N′-bis-(4-X-amino phenyl (4′-n-alkoxy)-salicylaldiminato), n?=?10, 18; X?=?Cl, NO2}, have been synthesized from the interaction of vanadyl (VO2+) and the bidentate [N,O] donor in methanol/ethanol. The compounds were characterized by FT–IR, 1H- and 13C-NMR, FAB-mass spectra, elemental analyses, and solution electrical conductivity. Mesomorphic behavior of the ligands and their vanadyl complexes were probed by polarizing optical microscopy and differential scanning calorimetry. The compounds are thermally stable and exhibit enantiotropic smectic A mesomorphism over the temperature range of 57–231°C. The mesophase–isotropic transition temperatures for the complexes are much higher than the ligands. Melting and clearing points of the compounds did not show any definitive trend with regards to alkoxy chain length or electronegative substituent. Variable temperature magnetic susceptibility measurements of the vanadyl complexes clearly show the absence of exchange interactions among the vanadyl spin centers. Non-electrolytic natures of the complexes were shown by conductometric measurements. A ν(V=O) of ~970?cm?1 corroborated the absence of any V=O?···?V=O interactions. Density functional theory study carried out using DMol3 at BLYP/DNP level to determine the energy-optimized structure revealed a distorted square pyramidal geometry for the vanadyl complexes. 相似文献
12.
New [1+1] and 62-membered [2+2] Schiff base macrocycles containing a 2,6-diamidopyridine subunit have been synthesized by condensation reaction of the precursors pyridine-2,6-dicarboxamide and 1,10-bis(20-formylphenyloxy)decane in the presence of phosphoric acid via a one-pot process. The cyclocondensed products were effectively isolated by gel column chromatography and characterized by ~1H NMR, FTIR, mass spectrometry and X-ray analysis. The two macrocycles have a twisted structure, and not an open ‘circular' conformation in the solid state. 相似文献
13.
A series of rhenium(I) tricarbonyl complexes, containing bidentate derivatives of aniline, was synthesized and structurally characterized. With 1,2-diaminobenzene (Hpda) the ‘2+1’ complex salt fac-[Re(CO)3(Hpda)2]Br was isolated. The neutral complex [Re(CO)3(Hapa)Br] was formed with 2-aminodiphenylamine (Hapa) as ligand. 2-Aminophenol (Hopa) also produced the neutral ‘2+1’ complex [Re(CO)3(opa)2(Hopa)], but with 2-mercaptophenol (Hspo) the bridged dimer [Re2(CO)7(spo)2] was found. In the complex [Re(CO)3(Htpn)Br] (Htpn = N′-{(2-methylthio)benzylidene}benzene-1,2-diamine) the potentially tridentate ligand Htpn is coordinated via the methylthio sulfur and imino nitrogen atoms only, with a free amino group. 相似文献
14.
《Journal of Coordination Chemistry》2012,65(20):3510-3520
A series of structurally similar dinuclear oxovanadium(V) complexes, [VO2L]2 (L?=?L1?=?2-[(2-methylaminoethylimino)methyl]phenolate (1); L?=?L2?=?2-[(2-ethylaminoethylimino)methyl]phenolate (2); L?=?L3?=?2-[(2-isopropylaminoethylimino)methyl]phenolate (3)), has been synthesized and characterized by physico-chemical methods and single-crystal X-ray diffraction. The V in each complex is octahedral, with three donors of L and one oxo defining the equatorial plane, and with two oxos occupying the axial positions. The complexes were tested for their urease inhibitory activities. The inhibition rate (%) of 1, 2, and 3 at 100?µmol?L?1 on urease are 67?±?1, 53.5?±?0.9, and 44?±?1. The relationship between structures of the complexes and the urease inhibitory activities indicates that shorter terminal groups of the complexes have stronger activities against urease. Molecular docking study of the complexes with the Helicobacter pylori urease was performed. 相似文献
15.
J. M. Fernández J. J. Lembrino-Canales R. Villena 《Monatshefte für Chemie / Chemical Monthly》1994,125(3):275-284
Summary The Schiff base ligands, 3-[(Phenyl)-2-hydroxy-3H-Naphth-3-ylidene)methyl]aldamine (1) and 3-[(benzene-4-trifluoromethyl)-2-hydroxy-3H-naphth-3-ylidene)methyl]aldamine (2), and their corresponding Cu(II) complexes (I andII were synthesized. The crystal and molecular structures ofI andII were determined. CompoundI crystallizes in the triclinic crystal systema=10.804(5),b=12.589(5), andc=10.369(3) (Å), =107.72(3), =95.75(3), and =76.32(4)(°), in the space group P
withZ=2. CompoundII crystallizes in the triclinic crystal systema=10.718(2),b=13.861(4), andc=10.110(9) (Å), =95.99(2), =90.16(2), and =93.90(2)(°), in the space group P
withZ=2. The geometry around the metal atom in both complexesI andII is square planar.
Kupfer(II)-Komplexe von Schiffbasen von 2-Hydroxy-3-naphthaldehyd. Die Kristall-und Molekülstrukturen von Bis{(phenyl)[(2-oxo-3H-naphth-3-yliden)methyl]aminato}kupfer(II) und Bis{(benzen-4-trifluoromethyl)[(2-oxo-3H-naphth-3-yliden)methyl]aminato}kupfer(II)
Zusammenfassung Es wurden die Schiffbasen-Liganden 3-[(Phenyl)-2-hydroxy-3H-naphth-3-yliden)-methyl]aldamin (1) und 3-[(Benzen-4-trifluoromethyl)-2-hydroxy-3H-naphth-3-yliden)-methyl]aldamin (2) inklusive der entsprechenden Kupfer(II)-KomplexeI undII dargestellt. VonI undII wurden die Kristallstrukturen ermittelt. KomplexI kristallisiert im triklinen System mita=10.804(5),b=12.589(5),c=10.369(3) Å, =107.72(3), =95.75(3) und =76.32(4)° in der Raumgruppe P mitZ=2. VerbindungII kristallisiert ebenfalls im triklinen System mita=10.718(2),b=13.861(4),c=10.110(9) Å, =95.99(2), =90.16(2) und =93.90(2)° in der Raumgruppe P mitZ=2. Die Geometrie rund um Cu ist in beiden Komplexen quadratisch-planar.相似文献
16.
Iron and sugar are essential components of life processes. In the evident interest toward Fe(III) compounds to explore the ability of sugars toward metallotherapy, a systematic hyphenated DFT-experimental study of a novel sugar Schiff base Fe(III) complex of general composition [Fe(L)(OH)], where L = N-dehydroacetic acid-glucosamine (dha-glsH2), is presented. Based on various experimental spectrometric and spectroscopic characterization techniques in combination with theoretical data, a suitable distorted tetragonal structure is suggested for the complex. In addition to the formulation of the synthesized complex, superoxide dismutase (SOD) mimetic, and antimicrobial actions have also been the active goal of the work. A promising superoxide dismutazing potential with IC50 = 69 μM was found. But on the other hand antibacterial action of the complex has shown less sensitivity to be called as efficient bactericidal agent. 相似文献
17.
MoCl4, ReCl4, and ReCl5 react with PCl5 in sealed glass ampoules at temperatures between 220° and 320° to [PCl4]2[Mo2Cl10] ( 1 ) [PCl4]2[Re2Cl10] ( 2 ), and [PCl4]3[ReCl6]2 ( 3 ). 2 crystallizes isotypically to the previously reported 1 and the respective titanium and tin containing analogues. The structure (triclinic, P1, Z = 1, a = 897.3(2), b = 946.0(2), c = 687.13(9) pm, α = 95.59(2)°, β = 95.80(2)°, γ = 101.07(2)°, V = 565.4(2) 106 pm3) is built of tetrahedral [PCl4]+ and edge sharing double octahedral [Re2Cl10]2– ions and can be derived from a hexagonal closest packing of Cl– ions with tetrahedral and octahedral holes partially filled by P(V) and Re(IV), respectively. 3 crystallizes isotypically to [PCl4]3[PCl6][MCl6] (M = Ti, Sn) (tetragonal, P 42/mbc, Z = 4, a = 1496.2(1), c = 1363.2(2) pm). Because no evidence was found for the presence of [PCl6]– ions, Re in 3 has to be of mixed valency with ReIV and ReV sharing the same crystallographic site. The structure can be derived from a cubic closest packing or alternatively from an only sparsely distorted body centered cubic arrangement of Cl– ions which is rarely found for anion arrays. The tetrahedral and octahedral holes are partially filled by PV and MIV/V, respectively. Magnetic measurements show all three compounds to be paramagnetic and confirm the oxidation state IV for Mo and Re in 1 and 2 and the mixed valence (IV/V) for Re in 3 . 相似文献
18.
P. Viswanathamurthi R. Karvembu V. Tharaneeswaran K. Natarajan 《Journal of Chemical Sciences》2005,117(3):235-238
Reactions of ruthenium(II) complexes [RuHX(CO)(EPh3)2(B)] (X = H or Cl; B = EPh3, pyridine (py) or piperidine (pip); E = P or As) with bidentate Schiff base ligands derived by condensingo- hydroxyacetophenone with aniline,o- orp-methylaniline have been carried out. The products were characterized by analytical, IR, electronic and1H-NMR spectral studies and are formulated as [Ru(X)(CO) (L)(EPh3)(B)] (L = Schiff base anion; X = H or Cl; B = EPh3, py or pip; E = P or As). An octahedral structure has been tentatively proposed for the new complexes. The new complexes
were tested for their catalytic activities in the oxidation of benzyl alcohol to benzaldehyde. 相似文献
19.
20.
《印度化学会志》2021,98(11):100186
The article reports the synthesis and characterization of a new palladium(II) complex of type [(LNNN1−)PdCl] (1) where LNNN1− is a mono anionic Schiff's base having a imine bond in reduced state. The LNNN1− is generated from a tridentate NNN donor ligand (LNNN) through in-situ reduction using sodium borohydride, where LNNN is [(E)-N-(phenyl(pyridine-2-yl)methylene)quinoline-8-amine)]. 1 is characterized by the single crystal X-ray diffraction study, IR, mass and UV–Vis spectroscopy. The X-ray bond parameter authenticates the imine bond of the coordinated Schiff's base anion is in reduced state. 1 exhibits catalytic activity towards the oxidation of 3,5-ditertiarybutyl catechol(3,5-DTBC) with turnover number (Kcat) = 135.6 h-1. The catalytic oxidation of 3,5-DTBC is authenticated by the UV–Vis, mass and EPR spectroscopy. An isotropic EPR signal with g = 2.011 of a solution containing 1 and 3,5-DTBC authenticating the generation of organic radical during the oxidation process. Cyclic voltammogram of 1 displays an irreversible anodic wave at +0.22 V may be due to the oxidation of N− to N•−. The atomic spin density of 1+ obtained from DFT calculation is also supporting the N-centre oxidation process. 相似文献