首页 | 本学科首页   官方微博 | 高级检索  
相似文献
 共查询到20条相似文献,搜索用时 15 毫秒
1.
The synthesis and characterization of some transition metal cis-3,7-dimethyl-2,6-octadiensemicarbazone (CDOSC) complexes are reported. The ligand CDOSC yields: [ML2 Cl2] and [ML2 Cl2] Cl type complexes, where M = CrIII, MnII, FeIII, CoII, NiII, CuII, ZnII, CdII and HgII, L = CDOSC. Structures of the complexes were determined using elemental analysis, molar conductivity, magnetic measurements, i.r. and electronic, as well as n.m.r spectra. CDOSC acts as a bidentate ligand in all the complexes. All the newly synthesized metal complexes, as well as the ligand, were screened for their antibacterial activity. All the complexes exhibit strong inhibitory action against Gram (+) bacteria Staphylococcus aureus and Gram (−) bacteria Escherichia coli. The antibacterial activities of the complexes are stronger than those of the ligand CDOSC itself.  相似文献   

2.
Summary Vanillin thiosemicarbazone (VTSC) has been used to isolate the complexes of the types [M(VTSC)2(H2O)2]X2 (M=MnII, FeII, CoII, or NiII and X=Cl) and [M(VTSC)X2]H2O (M=CuII, ZnII, CdII or HgII and X=Cl). Probable structures of these complexes are suggested on the basis of elemental analysis, molar conductance, magnetic moment and electronic and i.r. spectral data. The fungicidal activity of VTSC and the isolated complexes has been evaluated on pathogenic fungi,Alternaria (Sp.),Paecilomyces (Sp.) andPestalotia (Sp.).On leave from the University of Myosore.  相似文献   

3.
Summary New complexes of general formulae [Ni(HL)2], [ML]·H2O and [Cu(HL)X] (H2L = pyrrole-2-aldehyde Schiff bases ofS-methyl- andS-benzyldithiocarbazates; X = Cl or Br; M = NiII, CuII, ZnII or CdII) were prepared and characterized by a variety of physicochemical techniques. The Schiff bases coordinate as NS bidentate chelating agents in [Ni(HL)2] and [Cu(HL)X], and as tridentate NNS chelates in [ML] (M = NiII, CuII, ZnII or CdII). Both the [Ni(HL)2] and [NiL] complexes are diamagnetic and square-planar. Based on magnetic and spectroscopic evidence, thiolate sulphur-bridged dimeric square-planar structures are assigned to the [Cu(HL)X] and [ML] (M = NiII or CuII) complexes. The complexes ML (M = ZnII or CdII) are polymeric and octahedral.  相似文献   

4.
Summary Complexes having the chemical compositions [VO(Habth)2SO4], [M(Habth)2Cl2] [M=CoII, NiII, CuII or ZnII) and [M(abth)2] [M=VIVO, CoII, NiII, CuII or ZnII) and Habth=2-aminobenzophenone-2-thenoylhydrazone] have been prepared and characterized. The complexes are non-electrolytes. Magnetic moments and electronic, photoacoustic, e.s.r. and i.r. spectra of the complexes are used to establish the stereochemistry and mode of bonding of the hydrazone.  相似文献   

5.
Summary Magnetic susceptibilities of the biacetyldihydrazone (BdH) complexes [M(BdH)3](NO3)2 (M = CoII, NiII, CuII or ZnII), [Fe(BdH)3](NO3)3, [M(BdH)3](Ni(dto)2] (M = CoII, NiII or ZnII; dto = dithiooxalate), [(BdH)2Cu(dto)Ni(dto)] and [Fe(BdH)3]2[Ni(dto)2]3 have been studied in the 4.2–295 K range. ZnII complexes are diamagnetic, and complexes of NiII, CuII and FeIII obey the Curie-Weiss law. The CoII complexes behave anomalously and the results are interpreted in terms of a high spinlow spin equilibrium.  相似文献   

6.
Summary CuII, NiII, CoII, ZnII and PdII complexes of tridentate Schiff base ligands derived from the condensation of benzoic acid hydrazides with 2-aminonicotinaldehyde have been prepared and characterized. For M=Cu, Ni, Co and Zn the complexes were formulated as [M(ligand)(H2O)X] (X=Cl, Br), with a distorted octahedral geometry and tridentate Schiff base ligands. The Pd complexes were formulated as Pd(ligand)Cl2, with square planar geometries and bidentate Schiff base ligands. The e.s.r. spectra of the CuII complexes are discussed.  相似文献   

7.
Asymmetrical macrocyclic complexes of MnII, CoII, NiII, CuII and ZnII have been synthesized by the template process using bis(benzil)ethylenediamine as precursor. Bis(benzil)ethylenediamine reacts with transition metal chlorides and trimethoprim in a 1:1:1 molar ratio in methanol to give several solid metal complexes of the general composition [M(L)X2] (M = MnII, CoII, NiII, CuII and ZnII, L = ligand and X = Cl?). They were characterized by physicochemical and spectroscopic techniques. Based on analytical, spectral and magnetic moments, all the complexes are identified as distorted octahedral structures. All the complexes are of the [M(L)X2] type. The shifts of the ν(CN) (azomethine) stretches have been monitored. To find out the donor sites of the ligands, the activity data show that the metal complexes are more potent than the parent ligand. The [M(L)X2] complexes showed a broad spectrum of antimicrobial activity in vitro against both gram-positive and gram-negative human pathogenic bacterial isolates and the antimicrobial spectrum enhanced only with a combination of metal chlorides and trimethoprim complex. From the results it is imperative that the synthesized macrocyclic [M(L)X2] complexes exhibit potent broad spectrum antibacterial activity.  相似文献   

8.
Summary 2-Aminoacetophenone-2-thenoylhydrazone, Haath, C4H3SC(O)NHN=C(Me)C6H4NH2-o, forms complexes with metal(II) salts of empirical compositions [VO(Haath)2SO4], [M(Haath)2Cl2] [M=CoII, NiII, CuII or ZnII] and [M(aath)2] [M=VIVO, CoII, NiII, CuII or ZnII] which have been characterized by elemental analyses, molar conductance, magnetic susceptibility, electronic, e.s.r., i.r. and n.m.r. (1H and13C) spectral studies. X-ray and electron diffraction patterns have been obtained in order to elucidate the structure of the CuII complexes. Photoacoustic spectra of powder NiII complexes have been recorded and interpreted in the light of u.v./vis. spectra.  相似文献   

9.
The synthesis of CoII, NiII, CuII and CdII complexes of 2-furfural 4-phenyl semicarbazone (FPSC) with stoichiometric formulae: [M(FPSC)2X2] (M = Co, Ni or Cu; X = Cl or Br), [CuCl2(FPSC)] and [(CdCl2)2(FPSC)] has been obtained for the first time. The complexes were characterized by elemental analysis, molar conductivity, magnetic measurements, i.r., far i.r. and electronic spectra. FPSC is deduced to act as a bidentate ligand in the CoII, NiII and CuII complexes and as a tetradentate one in [(CdCl2)2(FPSC)].  相似文献   

10.
The complex Pd(μ-OOCMe)4Cu(OH2) · 2Pd3(μ-OOCMe)6 was synthesized and characterized by X-ray crystallography. In the heterometallic moiety of this complex, the PdII and CuII atoms are at an extraordinary short distance (2.521(3) Å). DFT quantum-chemical calculations of the geometric and electronic structure of a series of heterobinuclear paddlewheel complexes PdIIMII(μ-OOCMe)4L (M = ZnII, NiII, CuII, CoII, FeII; L = OH2 and NCH) and their formate analogues PdIIMII(μ-OOCH)4L (M = ZnII, NiII, FeII) showed that the extraordinary short Pd?M distance in all these complexes is caused only by the tightening effect of carboxylate bridges rather than by the metal-metal bond. The direct Pd-M interaction becomes possible only after removal of electrons from the antibonding orbitals and formation of oxidized complexes of the [PdIII(μ-OOCMe)4NiIII]2+ type.  相似文献   

11.
Cefazolin (Hcefaz) interacts with transition metal(II) ions to give [M(cefaz)Cl] complexes (M = MnII, CoII, NiII, CuII, ZnII, PdII) and [Ag2(cefaz)2Cl2] which were characterized by physicochemical and spectroscopic methods. Their i.r. and the 1H-n.m.r. spectra suggest that cefazolin behaves as a monoanionic tetradentate ligand. The complexes have been screened for antibacterial activity and the results are compared with the activity of cefazolin.  相似文献   

12.
Summary Metal(II) complexes of 2-acetylthiophene-2-furoylhydrazone (HL) of the types [VO(HL)SO4], [Cu(HL)2Cl2(H2O)], [M(HL)2Cl2] [M=CoII, NiII, or ZnII] and [ML2(H2O)2] [M=CoII, NiII, CuII or ZnII] have been prepared and characterized on the basis of elemental analyses, molar conductance, magnetic susceptibility, visible, e.s.r. and i.r. spectral studies. The bonding and stereochemistry of the complexes are discussed.  相似文献   

13.
Summary The metal complexes of the type [M(SB)2(H2O)2] and [M(SB)2][where M = MnII, CoII, NiII or CuII, M = ZnII CdII, HgII and PbII and SBH = 2-(2-hydroxyacetophenone)imino-5-(p-anisyl)-1,3,4-oxadiazole] have been prepared and characterised by elemental analyses, thermal analyses, magnetic measurements, electronic and infrared spectral studies. The complexes [M(SB)2(H2O)2] possess octahedral structures, whereas complexes [M(SB)2] are tetrahedral. The crystal field parameters of the CoII and NiII complexes are also calculated.  相似文献   

14.
Synthesis and antibacterial activity of metal complexes of ciprofloxacin   总被引:3,自引:0,他引:3  
The interactions of ciprofloxacin (HCipro) with transition metals have been investigated. Two types of complexes, [M(Cipro)(OAc)(H2O)2] · 3H2O (M = MnII, CoII, CuII or CdII) and [M(Cipro)(OAc)] · 6H2O (M = NiII or ZnII), were obtained and characterized by physicochemical and spectroscopic methods. The i.r. spectra of the complexes suggest that the ciprofloxacin behaves as a monoanionic bidentate ligand. In vitro antibacterial activities of the HCipro and the complexes were tested.  相似文献   

15.
Summary Complexes of the potentially tetradentate ligand isonitroso-acetylacetone dithiosemicarbazone (inbtH2) of formulae [Ti(inbtH2)Cl2]Cl2, [M(inbt)], where M = VIV O, MnII, NiII or ZnII, [M(inbtH2)X2], where M = CoII and X = Cl, or M = NiII and X = Cl, Br or I, and [M(inbtH2)Cl2]Cl, where M = CrIII or FeIII, have been prepared and characterized by physico-chemical and spectroscopic methods. In all the compounds the metal is coordinated by the thiocarbonyl sulphur and imine nitrogen, as revealed by i.r. studies. The n.m.r. spectra of the complexes of NiII and ZnII confirm coordination through nitrogen. Possible structures for the complexes are proposed. The Mössbauer spectrum of the FeIII complex is discussed.  相似文献   

16.
Treatment of [M(AMP)Cl2] (M = PtII, PdII; AMP = 2-aminomethylpyridine) with 1 mole of AgX (X = ClO4, BF4, PF6) in dmso yields [M(AMP)(dmso)Cl]X. Single crystal X-ray structure determinations of the PdII and PtII complexes indicate that dmso is S-bondedtrans to the pyridyl ring in both complexes. (2-Aminomethylpyridine)chloro(dimethylsulphoxide-S) palladium(II) tetrafluoroborate.  相似文献   

17.
Two tridentate Schiff bases having ONS and NNS donor sequences were prepared by condensing S-benzyldithiocarbazate (NH2NHCSSCH2Ph) (SBDTC) with pyridine-2-carboxaldehyde and salicylaldehyde, respectively. Complexes of these ligands with NiII, ZnII, CrIII, CoII, CuII, and SnII were studied and characterized by elemental analyses and various physico-chemical techniques. NiII, CuII, ZnII and SnII complexes were four-coordinate while the CrIII, SrIII and CoIII complexes were six-coordinate. The ONS Schiff base was moderately active against leukemia, while its zinc, antimony and cobalt complexes were strongly active against leukemic cells with DC50 = 0.35–5.00.  相似文献   

18.
Summary Binuclear complexes of the type [M(HDCDP)(H2O)n]2 and [M(HDCDB)(H2O)n]2, where HDCDP and HDCDB are Schiff bases derived from glycine and diacetylmonoxime, and orthoaminobenzoic acid and diacetylmonoxime respectively, M=VOII, CoII, NiII, CuII or AgII and n=0 or 2, have been synthesized. Physical and spectroscopic analyses indicate a binuclear structure for the complexes with metal ions in an octahedral environment, where the ligands coordinate to the metal centre through azomethine nitrogens, oxime and carboxylate oxygen in a tetradentate manner.  相似文献   

19.
Summary A variety of metal(II) complexes of 2-carbethoxypyridine (L) have been prepared and characterised. With metal(II) chlorides the bis complexes can be formulated [ML2Cl2]o (M=CuII, NiII, CoII, FeII or MnII). The complexes are six-coordinate with 2-carbethoxypyridine acting as a bidentate ligandvia the pyridine nitrogen and the carbonyl group of the ester. The chloro complexes are nonelectrolytes in nitroethane; magnetic susceptibility measurements, i.r. and d-d electronic spectra are reported. With metal(II) perchlorate salts the complexes can be formulated as six-coordinate [ML2 (OH2)2] [ClO4]2 species containing ionic perchlorate. The ester exchanges of some of these complexes with a variety of primary alcohols have been investigated.  相似文献   

20.
The solid-state thermal decomposition of the dinuclear pivalate complexes LM(μ-OOCR)4ML, both those synthesized earlier (M = MnII, FeII, or CoII; L = 2,6-(NH2)2C5H3N)) and new complexes (M = CuII; L = 2,6-(NH2)2C5H3N or (2-NH2)(6-CH3)C5H3N), was studied by differential scanning calorimetry and thermogravimetry. The decomposition of the CoII complexes is accompanied by the aggregation to form the volatile octanuclear complex Co84-O)2n-OOCCMe3)12 (n = 2 or 3), whereas the thermolysis of the MnII, FeII, and CuII complexes is destructive, the phase composition of the decomposition products being substantially dependent on the nature of metal and the α substituent R in the apical organic ligand.  相似文献   

设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号