共查询到20条相似文献,搜索用时 15 毫秒
1.
Sharma Disha Revanasiddappa Hosakere D. Jayalakshmi Basavegowda 《Journal of the Iranian Chemical Society》2020,17(1):43-58
Journal of the Iranian Chemical Society - Eight new coordination compounds of Mn(III) with (E)-2-((3-(benzyloxypyridinylimino) methyl)-4-bromophenol (L1), (E)-2-((3-(benzyloxypyridinylimino)... 相似文献
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Prasad KS Kumar LS Chandan S Jayalakshmi B Revanasiddappa HD 《Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy》2011,81(1):276-282
Four Schiff base ligands and their corresponding organotin(IV) complexes have been synthesized and characterized by elemental analyses, IR, (1)H NMR, MS and thermal studies. The Schiff bases are obtained by the condensation of 3-amino-2-methyl-4(3H)-quinazolinone with different substituted aldehydes. The elemental analysis data suggest the stoichiometry to be 1:1 ratio formation. Infrared spectral data agreed with the coordination to the central metal ion through imine nitrogen, lactam oxygen and deprotonated phenolic oxygen atoms. All the synthesized compounds have been evaluated for antimicrobial activity against selected species of microorganisms. In addition, DNA binding/cleavage capacity of the compounds was analyzed by absorption spectroscopy, viscosity measurements and gel electrophoresis methods. 相似文献
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Devi Jai Pachwania Sushila Kumar Deepak Jindal Deepak Kumar Jan Suraya Dash Ashutosh K. 《Research on Chemical Intermediates》2022,48(1):267-289
Research on Chemical Intermediates - Organotin(IV) complexes are gaining major attention as drug candidates, accordingly we have synthesized a cluster of novel diorganotin(IV) complexes R2SnClL... 相似文献
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A series of intramolecular complexes with Schiff base ligands having N∩S and N∩O donor systems were synthesized in an open vessel under microwave irradiation (MWI) using a domestic microwave oven. The reaction time has been brought down from hours to seconds with improved yield as compared with the conventional heating. The complexes have been characterized on the basis of elemental analysis, conductance measurements and spectroscopic analysis. Based on the IR, 1H NMR, 11B NMR and 13C NMR spectroscopic studies, a tetrahedral geometry has been proposed for the resulting complexes. The compounds have been screened in vitro against bacteria and fungi to test their antimicrobial property and in vivo in male albino rats to test their antifertility property. The testicular sperm density, motility and density of cauda epididymal spermatozoa along with biochemical parameters of reproductive organs have been examined and discussed. Copyright © 2007 John Wiley & Sons, Ltd. 相似文献
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《Journal of Coordination Chemistry》2012,65(13):1521-1526
The reaction of equimolar quantities of trans-[ReOCl3(PPh3)2] and 8-hydroxyquinoline (Hhqn) in benzene led to the isolation of the six-coordinate complex [ReOCl2(hqn)(PPh3)] (1). With 2-pyridine-ethanol (Hhep) the compound [ReOCl2(hep)(PPh3)] (2) was obtained. Both hqn and hep ligands act as monoanionic bidentate N,O-donor chelates. Although the two complexes are very similar, there are some significant differences in certain bond distances and angles in them. Both complexes contain the nearly linear trans O=Re–O axis, with this angle equal to 160.9(2)° and 167.8(1)° in 1 and 2, respectively. 相似文献
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Mukesh Kumar Biyala Krishna Sharma Monika Swami Nighat Fahmi Ran Vir Singh 《Transition Metal Chemistry》2008,33(3):377-381
The monobasic bidentate Schiff base complexes of palladium(II) and platinum(II) derived from 1H-indol-2,3-dione thiosemicarbazone
(L1H) and 1H-indol-2,3-dione semicarbazone (L2H) have been characterized on the basis of elemental analysis, molecular weight determinations, i.r., 1H n.m.r. and u.v. spectral studies. Based on these studies a square planar environment around the metal atoms has been proposed.
Antimicrobial effects of both the ligands and their complexes on different species of pathogenic fungi and bacteria have been
recorded and these are found to possess significant fungicidal and bactericidal properties. 相似文献
8.
Beata Burda John Burgess Simon A. Parsons Alina Samotus Janusz Szklarzewicz 《Transition Metal Chemistry》1995,20(3):291-294
Summary The reaction of [M(CN)4O(OH2)]2– (M = Mo or W) with 2-acetylpyridine and methyl-or butyl-amine in a water-MeOH mixture gave [M(CN)3O(L-L)]- (L-L= Schiff base ligand), isolated as [AsPh4]+ salts. The complexes have been characterized by elemental analysis, and electronic, i.r. and1H-n.m.r. spectroscopy. The Schiff base ligands complex in a bidentate manner through the two nitrogen atoms giving mixed-ligand compounds similarly to 2,2-bipyridyl or 1,10-phenanthroline.On leave from the Faculty of Chemistry, Jagiellonian University, Kraków. 相似文献
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A family of oxorhenium(V) complexes of newly designed pyridylthioazophenolate ligands has been synthesized and isolated in
pure form. The solid state structure of an organic compound (HL1) has been established by X-ray crystallography. The molecular
structure observed in the solid state is that the two molecules of the ligand (HL1) in the asymmetric unit have similar geometries,
except for the orientation of the pyridine ring. This series of organic moieties acts as tetradentate monobasic NSNO donor
chelators in oxorhenium(V) complexes which has been characterized by elemental analyses, IR, 1H-NMR, UV–Vis. The complexes are 1:1 electrolytes in nature in MeOH solution, the counter anion being ClO
4
−
. The electrochemical studies of the [ReVO(L)Cl]ClO4 complexes in MeCN using TBAP as supporting electrolyte exhibit quasi-reversible voltammogram showing one-electron couple
for [ReVIO(L)Cl]2+−[ReVO(L)Cl]+ in the 1.11–1.29 V vs SCE range. 相似文献
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《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
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New oxovanadium(V) complexes, [VOL(hq)] (1)–(4) have been prepared by the reaction of [VO(acac)2] with ligands LH2 in the presence of 8-hydroxyquinoline (Hhq). LH2 is the dibasic tridentate ONO Mannich base [(S)-H2glysal, (S)-H2alasal, (S)-H2leusal and (S)-H2ileusal; S represents the S-enantiomer] obtained by the reduction of the Schiff bases of salicylaldehyde (sal) and the amino acids: glycine (gly), DL-alanine (ala), leucine (leu) and isoleucine (ileu), respectively. Spectral studies suggest an octahedral structure for these complexes. The complexes exhibit a single 51V-n.m.r. signal at –464.6 to –468.0 p.p.m. due to the existence of a single isomeric species in solution. In the presence of L-ascorbic acid under aerobic conditions [VO(S-glysal)(hq)] (1) and [VO(S-isoleusal)(hq)] (4) are converted into the corresponding dioxo species possible via intermediate reduction. A time- dependent 51V-n.m.r. study has also been carried out in order to investigate the possible isomerisation and/or further reaction in solution. 相似文献
13.
Edoardo Roncari Ulderico Mazzi Roberto Rossi Adriano Duatti Luciano Magon 《Transition Metal Chemistry》1981,6(3):169-173
Summary Some isomers of the ReOX2LPPh3 complexes [X = Cl or Br and L =N-methylsalicylideneiminate,N-phenylsalicylideneiminate, halfN,N'-ethylenebis(salicylideneiminate) or 8-hydroxyquinolinate] have been synthesized and characterized. Two different mechanisms for reaction of thetrans-ReOX3(PPh3)2 complexes (X = Cl or Br) with the Schiff bases are supported by qualitative studies on such parameters as the Schiff base ligand form, concentration of free triphenylphosphine ligand, reaction solvent and temperature. 相似文献
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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
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Dharmaraj Nallasamy Viswanathamurthi Periasamy Natarajan Karuppannan 《Transition Metal Chemistry》2001,26(1-2):105-109
The reactions of ruthenium(II) complexes, [RuHCl(CO)(PPh3)2(B)] [B = PPh3, pyridine (py) or piperidine (pip)], with bidentate Schiff base ligands derived by condensing salicylaldehyde with aniline, o-, m- or p-toluidine have been carried out. The products were characterised by analytical, i.r., electronic, 1H-n.m.r. and 31P-n.m.r. spectral studies and are formulated as [RuCl(CO)(L)(PPh3)(B)] (L = Schiff base anion; B = PPh3, py or pip). An octahedral structure has been tentatively proposed for the new complexes. The Schiff bases and the new complexes were tested in vitro to evaluate their activity against the fungus Aspergillus flavus. 相似文献
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《Journal of Coordination Chemistry》2012,65(7):567-574
Reactions of ruthenium(II) carbonyl complexes of the type [RuHCl(CO)(PPh3)2(B)] [B?=?PPh3, pyridine (py), piperidine (pip) or morpholine (mor)] with bidentate Schiff base ligands derived from the condensation of 2-hydroxy-1-naphthaldehyde with aniline, o-, m- or p-toluidine in a 1?:?1 mol ratio in benzene resulted in the formation of complexes formulated as [RuCl(CO)(L)(PPh3)(B)] [L?=?bidentate Schiff base anion, B?=?PPh3, py, pip, mor]. The complexes were characterized by analyses, IR, electronic and 1H NMR spectroscopy, and cyclic voltammetric studies. In all cases, the Schiff bases replace one molecule of phosphine and a hydride ion from the starting complexes, indicating that Ru–N bonds in the complexes containing heterocyclic nitrogenous bases are stronger than the Ru–P bond to PPh3. Octahedral geometry is proposed for the complexes. 相似文献
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Muhammad Shabbir Paul R. Raithby Lynne H. Thomas Hammad Ismail Faiza Arshad 《Journal of Coordination Chemistry》2017,70(14):2463-2478
Four novel ON donor Schiff bases (E)-3-((4-phenoxyphenylimino)methyl)benzene-1,2-diol (HL1),(E)-3-((4-(4-biphenyloxy)phenyliminomethyl)benzene-1,2-diol (HL2), (E)-3-((4-naphthoxyphenylimino)methyl)benzene-1,2-diol (HL3), (E)-3-((4-(2-naphthoxy)phenylimino)methyl)benzene-1,2-diol (HL4) and their copper(II) complexes bis((E)-3-((4-phenoxyphenylimino)methyl)benzene-1,2-diol) copper(II) (Cu(L1)2) bis((E)-3-((4-(4-biphenyloxy)phenylimino)methyl)benzene-1,2-diol) copper(II) (Cu(L2)2), bis((E)-3-((4-naphthoxyphenylimino)methyl)benzene-1,2-diol) copper(II) (Cu(L3)2), bis((E)-3-((4-(2-naphthoxy)phenylimino)methyl)benzene-1,2-diol) copper(II) (Cu(L4)2) have been synthesized and characterized by spectroscopic (FTIR, NMR, UV–visible) and elemental analysis. The crystal structures of HL1, HL2, HL3, and HL4 have been determined, which reveal intramolecular N-H?O (HL1, HL2, HL3, and HL4) hydrogen bonds in the solid state. Keto-amine and enol-imine tautomerism is exhibited by the Schiff bases in solid and solution states. The Schiff bases and their copper(II) complexes have been screened for their biological activities. In antimicrobial assays (antibacterial and antifungal), HL4 showed promising results against all strains through dual inhibition property while the rest of the compounds showed activity against selective strains. On the other hand, in cytotoxic, DPPH, and inhibition of hydroxyl (OH) free radical-induced DNA damage assays, the results were found significantly correlated with each other, i.e. the ligands HL1 and HL2 showed moderate activity while their complexes Cu(L1)2 and Cu(L2)2 exhibited prominent increase in activity. As the results of these assays are supporting each other, it represents the strong positive correlation and antioxidant nature of investigated compounds. 相似文献
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A series of octahedral RuII/RuIII complexes of the type [Ru(Y)(CO)(BAX)(PPh3)2] and [RuCl2(BAX)(PPh3)2] (Y = H or Cl; BAX = benzaldehydeacetylhydrazone anion; X = H, Me, OMe, OH, Cl or NO2) have been prepared and characterised by spectral, magnetic and cyclic voltammetric studies. The RuII complexes are low spin diamagnetic (S = 0) whereas the RuIII complexes are low spin and paramagnetic (S = 1/2). These RuII and RuIII complexes absorb in the visible region respectively at ca. 16,000 and 28,000 cm–1 which bands are assigned to the MLCT. The correlation of the max values of the RuIII complexes with the + Hammett parameter, is linear, indicating the profound effect of substituents on the electron density of the central metal. I.r. spectral data reveals that the hydrazone is chelated to ruthenium through the hydrazinic nitrogen and the deprotonated enolic oxygen. The rhombic nature of the e.s.r. spectra of the RuIII complexes indicates an asymmetry in the electronic environment around the Ru atom. RuII complexes in CH2Cl2 show an irreversible RuII/III redox couple at ca. 0.9–0.5 V, while the RuIII complexes show two reversible redox couples in the –0.1–0.1 and 0.8–0.6 V range, indicating that the higher oxidation state of ruthenium is stabilised by hydrazones. 相似文献
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《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
20.
Francisco C Gama S Mendes F Marques F dos Santos IC Paulo A Santos I Coimbra J Gabano E Ravera M 《Dalton transactions (Cambridge, England : 2003)》2011,40(21):5781-5792
A series of four Pt(II) complexes anchored by bidentate or tridentate pyrazolyl-alkylamine chelators bearing different substituents at the azolyl rings has been prepared with the aim to assess their interest in the design of novel anticancer drugs. All complexes have been fully characterized by classical analytical methods and three of them were characterized also by X-ray diffraction analysis. Their solution behavior, together with lipophilicity measurements, cell uptake, antiproliferative properties, DNA interaction have been evaluated. Albeit all the complexes were less active than cisplatin on ovarian carcinoma A2780 cell line, greatly retained their activity in the cisplatin-resistant A2780cisR cell line and presented a lower resistance factor compared to cisplatin. Moreover, the Pt(II) complexes under investigation were less prone to undergo deactivation by glutathione, believed to be the major cellular target of cisplatin that inactivates the drug by binding to it irreversibly. 相似文献