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1.
A series of complexes of thorium(IV) and oxozirconium(IV) with dibenzyl sulphoxide having the general compositions ThX4·2BzSO (X = Cl, Br, NCS or NO3), ThI4·4BzSO, Th(ClO4)4·6BzSO, ZrOX2·2BzSO (X = Cl, Br, I, NCS, NCSe or BPh4) and ZrO(ClO4)2· 6BzSO were synthesised and characterized by elemental analyses, electrolytic conductivity, moleculer weight, IR, and magnetic susceptibility measurements. TG and DTA of the complexes were also studied.  相似文献   

2.
Summary The synthesis and physical properties of crystalline thorium(IV) complexes, Th(ClO4)4 · 6 LNO, ThX4 · 2 LNO (X = Br or SCN), ThX4 · 4 LNO (X = NO3 or I) andTh(ClO4)4 · 10 TMSO, Th(NO3)4 · 6 TMSO, ThX4 · 4 TMSO (X = Cl or Br), ThI4 · 6 TMSO and Th(NCS)4 · 2 TMSO (where LNO = 2,6-lutidine-N-oxide and TMSO = tetramethylene sulphoxide) are reported together with their i.r. spectra, molar conductivities, molecular weights, t. g. a. and d. t. a. data. In all the complexes, LNO and TMSO are bonded to thorium(IV) through oxygen. The coordination number of thorium(IV) in these complexes varies from six to ten depending upon the nature of the anions.Presented at the XVI Annual Convention of Chemists, Andhra University, Waltair, A. P. India, December 27–31, 1978.  相似文献   

3.
Summary Crystalline thorium(IV) chelates with monoN-oxides of 2,2-bipyridine (bipyNO) and 1,10-phenanthroline (phenNO), ThX4 · 2L (X = Cl, Br, NO3 or NCS) and ThX4 · 3L (X = I or ClO4, and I = bipyNO or phenNO) have been synthesised and characterized on the basis of i.r. spectra, molar conductance, molecular weights, t.g.a. and d.t.a. data. All the complexes are weakly diamagnetic and contain bipyNO and phenNO bonded to thorium(IV) through nitrogen and oxygen. The coordination number of thorium(IV) varies from six to twelve depending on the nature of the anions.Author on leave from L. R. Postgraduate College, Sahibabad (Ghaziabad) and to whom all correspondence should be directed.  相似文献   

4.
In the present work, the authors describe the synthesis of some mixed ligand complexes of thorium(IV) derived from 4[N-(2′- hydroxy-1′-naphthalidene)amino]antipyrine semicarbazone (HNAAPS) or 4[N-(cinnamalidene)amino]antipyrinesemicarbazone (CAAPS) as primary ligand and diphenyl sulfoxide (DPSO) as secondary ligand with the general composition ThX4.n(L).DPSO (n = 1, X = Cl, Br, NCS or NO3; n = 2, X = I or ClO4, L = HNAAPS or CAAPS). All the compounds were characterized through elemental analysis, molar conductance, molecular weight, infrared data and thermogravimetric analysis. The infrared studies reveal that the semicarbazones behave as neutral tridentate (N,N,O) while DPSO coordinates through its oxygen atom. The nitrates are bicovalently bonded, while thiocyanates are N-coordinated in these compounds. In conclusion, the coordination number of the central metal ion displays coordination number 7, 8, 9 or 12 depending on the nature of the anionic ligands.  相似文献   

5.
Summary The reactions of divalent nickel and copper salts with the Schiff base derived from 2-(2-aminophenyl)benzimidazole and benzaldehyde, L, yield complexes of general formulae [CuL2X2] (X=Cl, Br, or ClO4), [CuL(SO4)], [CuL(SO4)] · 4H2O, and NiLX2 (X=Cl, Br, or NCS).All the complexes have been characterized by elemental analyses, magnetic measurements, e.s.r. electronic and i.r. spectral studies. The results show that the Schiff base acts as bidentate ligand through the pyridine-like imine nitrogen of imidazole ring and the azomethine nitrogen. Tentative structures of the complexes are suggested.  相似文献   

6.
The Schiff base NN′-ethylenebis(salicylideneimine), H2 salen reacts with hydrous and anhydrous Zinc, Cadmium and Mercury(II) salts to give complexes M(H2 salen)X2·nH2O (M = Zn, Cd, Hg; XCl, Br, I, NO3; MZn, X2SO4; n = 0?2). Spectroscopic and other evidence indicated that; (i) halide and sulphate are coordinated to the metal ion, whereas the nitrate group is ionic in mercury nitrate compound and covalently bonded in zinc and cadmium nitrato complexes, (ii) the Schiff base is coordinated through the negatively charged phenolic oxygen atoms and not the nitrogen atoms, which carry the protons transferred from phenolic groups on coordination, (iii) therefore the coordination numbers suggested are 4-, in mercury and 4- or 6- in zinc and cadmium Schiff base complexes.  相似文献   

7.
Summary Complexes of manganese(II) with the tridentate oxime ligand 2,6-diacetylpyridine dioxime (H2dapd) have been synthesized and characterized. The complexes [Mn(H2dapd)X2] are pentacoordinate for X = Cl, Br or I but apparently octahedralvia bridging anions for X = NCS or NCSe. The complex [Mn(H2dapd)(NO3)2] adopts an octahedral structure involving monodentate and bidentate coordination of nitro groups. The complexes [Mn(H2dapd)2]X2 (X = Cl, Br, I, NO3, NCS or NCSe) involve an octahedral cation.  相似文献   

8.
Summary Copper(II) and nickel(II) complexes with the Schiff base derived from 2-(2-aminophenyl)benzimidazole and salicylaldehyde, L, have been prepared. They are of the general types ML2X2 (M = Ni or Cu and X = Cl, Br, NO3 or ClO4) and NiL(NCS)2.The compounds have been characterized by elemental analyses, magnetic measurements, e.s.r., electronic and i.r. spectra studies. The i.r. spectra suggest that the molecule, and not the anion, of the Schiff base is coordinated as a bidentate ligand with the metal ion. Possible structures for the complexes have been proposed.  相似文献   

9.
Summary Some cobalt(II), nickel(II), copper(II) and copper(I) complexes of 2-mercapto-5-methyl-1,3,4-thiadiazole (mttz) and 2,5-bis(methylmercapto)-1,3,4-thiadiazole (bmttz) have been prepared and studied by conductometric and magnetochemical methods and by electronic and i. r. spectroscopy. The complexes CoX2 · 2L (L=mttz, X=Cl, Br or I; L=bmttz, X=Br or I), CoCl2 · bmttz are pseudotetrahedral, and the complexes NiX2 · mttz (X=Cl or Br), NiCl2 · 1.3 bmttz, NiBr2 · 1.5 bmttz are pseudooctahedral. The complex Co3(OAc)2 · 4(mttz-H) · 2H2O has an undefinite constitution. The polynuclear complexes CuCl2 · 1.3 mttz and CuBr2 · 1.2 mttz contain presumably pseudotetrahedral chromophores, the chloride having a subnormal magnetic moment. The CuX2 · 2 bmttz (X=Cl, Br or NO3) complexes have a six coordination with bridging ligand molecules. In the CuX · 2 mttz (X=Cl, Br or ClO4) complexes the anions are coordinated, while in the CuClO4 · 2 bmttz complex the perchlorate anion is ionically bonded.  相似文献   

10.
Summary Tetrachlorouranium complexes containing a Schiff base ligand, p-XC6H4NH=CHC6H4OH(L), derived from p-XC6H4NH2 and salicylaldehyde, have been prepared. Atris complex was obtained when X=NO2 andbis complexes for the other p-substituted Schiff bases when X=Cl, Br, OH and Me.  相似文献   

11.
The following zinc(II), cadmium(II) and mercury(II) complexes of 2-methyl-benzoselenazole (L) have been prepared and studied by conductometric and i.r. methods: MLX2 (M ? Cd, Hg, X ? Cl, Br, I), ML1.5X2 (M ? Zn, X ? ClO4(4 H2O); M ? Hg, X ? NO3, ClO4), ML2X2 (M ? Zn, X ? Cl, Br, I, NO3; M ? Cd, X ? NO3, ClO4). The ligand is N-bonded. All the anions are coordinated.  相似文献   

12.
Summary The Schiff bases a-(C5H4N)CMe=NNHCOR (R = Ph, 2-thienyl or Me), prepared by condensation of 2-acetylpyridine with the acylhydrazines RCONHNH2, coordinate in the deprotonated iminol form to yield the octahedral complexes, M[NNO]2 M = Co or Ni; [NNOH] = Schiff base and the square-planar complexes, Pd[NNO]Cl. The Schiff bases also coordinate in the neutral keto form yielding the octahedral complexes (M[NNOH]2)Z2 (M = Ni, Co or Fe; Z = C104, BF4 or N03) and complexes of the type M[NNOH]X2 (M = Ni, Co, Fe or Cu; X = Cl, Br or NCS). Spectral and x-ray diffraction data indicate that the complexes M[NNOH]X2 (M = Ni or Fe) are polymeric octahedral, as are the corresponding cobalt complexes having R = 2-thienyl. However, the cobalt complexes Co[NNOH]X2 (X = CI or Br; R = Ph or Me) and the copper complexes Cu[NNOH]CI2 (R = Ph, 2-thienyl or Me) are five-coordinate, while the thiocyanato complex Co[NNOH](NCS)2 (R = 2-thienyl) is tetrahedral.  相似文献   

13.
Two new Zn2Dy2 complexes were constructed from Zn (II) salen‐type Schiff base complex fragment and 2,6‐pyridinedimethanol (H2pdm) or its Br‐substituted analogue (4‐bromopyridine‐2,6‐diyl)dimethanol (H2Brpdm); their molecular formulas are [Zn2Dy2(L)2(pdm)2(MeOH)2](ClO4)2 [ 1 , H2L = N, N′‐ bis(3‐methoxysalicylidene)‐1,3‐diaminopropane] and [Zn2Dy2(L)2(Brpdm)2(MeOH)2](ClO4)2 [ 2 ], the Dy (III) ions of which have a NO7 triangular dodecahedral coordination sphere. The two complexes show not only ferromagnetic interaction but also field‐induced single‐molecule magnet (SMM) behavior, which are rare Dy (III)‐containing cluster complexes with the NO7 triangular dodecahedral coordination sphere that can show good magnetic relaxation. The energy barrier value of complex 2 is higher than those of complex 1 and the Dy (III) complexes with the DyNO7 triangular dodecahedral coordination configuration reported in the literature.  相似文献   

14.
Summary Copper(II) complexes of general formula [Cu(L4A)X] (where L4A is the deprotonated ligand, 1 H-hexahydroazepine-1-thiocarboxylic acid-2-[1-(2-pyridinyl)ethylidene]hydrazide and X=Cl, Br, I, NCS, NO3 and OAc) and [Cu(HL4A)(L4A)]ClO4 have been prepared and characterized by elemental analyses, magnetic susceptibility measurements, i.r. spectra, electronic spectra, conductivity measurements and e.s.r. spectra in the polycrystalline state and in chloroform solution. For all complexes, except the perchlorate salt, coordination occurs via imine nitrogen, pyridine nitrogen and thione sulphur. For the perchlorate salt, L4A is tridentate, while HL4A is monodentate via imine nitrogen. Electronic spectra suggest planar geometry for all the complexes. The calculated e.s.r parameters suggest coordination through sulphur in agreement with the i.r. results.  相似文献   

15.
Summary New complexes of general formula [M(NNS)X] (NNS = anion of the Schiff base of 2-aminobenzaldehyde with S-methyldithiocarbazate; M = Ni, Cu, Pd or Pt; X = Cl, Br, I, NCS, NO3 or AcO), [Ni(NNS)(HNNS)]NO3 and [Co(NNS)2]Cl were prepared and characterised. The magnetic and spectral evidence suggests a square-planar structure for the mono-ligated complexes and an octahedral structure for the bis-chelated complexes. The copper(II) complexes have been shown to display high antifungal activities against the pathogenic fungi, Alternaria alternata and Curvularia geniculata.  相似文献   

16.
Summary Trivalent chromium, manganese, iron and cobalt salts react withm-phenylenediamine and acetylacetone to give complexes of the type [M(C16H18N2O2)X]: X = Cl, Br, NO3 or NCS for M = chromium(III) and iron(III); X = Cl, Br, OAc or NCS for manganese(III); and X = OH for cobalt(III). Conductance measurements show the complexes to be nonelectrolytes. Molecular weights determined cryoscopically, show the iron complexes to be dinuclear. Magnetic measurements above 85 K reveal the presence of slight antiferromagnetic interactions. The complexes are dimeric five-coordinate square-pyramidal withm-phenylenediamine residues acting as bridges. The electronic spectra are interpreted in terms of the Normalised Spherical Harmonic Hamiltonian Theory and the DT/DQ values which indicate that chromium complexes are slightly distorted, whereas those of manganese are severely distorted.  相似文献   

17.
Summary Several new polymeric complexes of general composition MOn(L)4X2 (where M = V, Zr and U; n = 1 or 2; X = Cl, Br, I, NO3 and NCS and L = N2H4, PhNHNH2 and Me2NNH2 have been synthesised and characterized by elemental and d.t. analyses and by magnetic measurements, electronic and i.r. spectra. The vanadyl(IV) complexes exhibit subnormal magnetic moments (1.26–1.36BM) possibly because of exchange interaction between vanadium(IV) ions. The thermal stability of hydrazine complexes fall in the order: Cl>Br>NCS>I. The M-N bond strength, as revealed, by v(M-N), decreases as: Me2NNH2>N2H4>PhNHNH2.Presented in symposium on Frontiers of coordination chemistry, Allahabad University, Allahabad, Dec. 6–8, 1979.  相似文献   

18.
Some cobalt(II) complexes of 4,6-dimethylpyrimidine-2(1H)-one (HL) have been prepared and studied by infrared and electronic spectra and by magneto-chemical and conductometric measurements. The ligand is coordinated through the unprotonated ring-nitrogen atom and in one case also through the carbonylic oxygen atom. The “blue” complexes [CoX2 · 2HL] (X2 = Cl2, ClBr, Br2, (NCS)2) and [CoX2 · 2HL] · 2HL (X = Cl, Br) have a distorted C2v [CoX2N2] coordination; the thiocyanate ion is N-bonded to the metal. The “green” complexes CoX2 · 2HL (X = Cl(4H2O), Br) have a square-pyramidal [CoX2N2O] coordination. The “pink” CoX2 · 4HL · nH2O (X = ClO4, n = 2; X = BF4, n = 8; X = F3Ac, n = 4) and “cream” CoX2 · 4HL · 6 H2O (X = I, ClO4) complexes have an octahedral coordination; only the F3Ac? ion is coordinated. The “cyclamen” CoAcL · 2HL · 2 H2O and Co3Ac4L2 · 2HL · 2H2O complexes have a polynuclear constitution; the Ac? ion behaves as bidentate ligand.  相似文献   

19.
Preparation and properties of nickel(II) and cobalt(II) chelates of the bidentate ligand trans-2-ethylthio-cyclohexyl-phenylphosphine (ÄMCPP) are described. Three types of nickel(II) complexes have been obtained from ÄMCPP: the four-coordinated, square planar [Ni(ÄMCPP)2]X2 (X = J, Br, ClO4); five-coordinated [Ni(ÄMCPP)2X]X (X = Cl, NCS), [Ni(ÄMCPP)2X]BPh4 (X = Cl, NCS) and the octahedral [Ni(ÄMCPP)2Cl2]. Cobalt(II) forms tetrahedral 1.1-[Co(ÄMCPP)X2] (X = Br, Cl) and 1.2-Co(ÄMCPP)2X2(X = Br, Cl, NCS) complexes. All compounds were characterized by electronic reflectance and absorption spectra, conductivity and magnetic measurements.  相似文献   

20.
Summary Some copper(II) complexes of the type Cu(HL)X·nH2O (where H2L = benzoin thiosemicarbazone; X=NO3; Cl, Br, SCN, ClO4 or 1/2SO4; n=O–2) have been prepared and characterized. All complexes have tetragonally distorted octahedral stereochemistry except the sulphatocomplex which is square pyramidal. The i.r. spectra reveal that HL acts as a monobasic tridentate ligand coordinating through the azine group nitrogen atom, thiocarbonyl sulphur atom and hydroxylic oxygen atom while NO3, Cl, Br and ClO4 act as terminal monodentate ligands and SCN and SO4 act as bidentate bridging ligands. The polycrystalline e.s.r. spectra suggest tetragonal symmetry for the copper(II) ion, involving a dx 2–y2 ground state.  相似文献   

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