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Zusammenfassung Die Komplexbildung des Kobalts mit p-Methylbenzamidoxim (pMBz) in alkal. Lösung wurde spektrophotometrisch untersucht. Die Ligandenzahl und die Bildungskonstanten wurden nach logarithmischen Methoden bestimmt. Bei niedrigeren Konzentrationen des pMBz entsteht ein Komplex 11 (bei höheren 12). Die Bildungskonstanten bei 25°C und =0,02 sind 1=(2,95±±0,06)·105 und =21,±0,3.
Co(II) complexes of p-Methylbenzamideoxime
The complex formation of cobalt with p-methyl benzamidoxime in alkaline solution was investigated spectrophotometrically, and the ligand number and the formation constants were determined by logarithmic methods. At low pMBz concentrations a 11 complex is formed and at higher ones a 12 complex. The formation constants are 1=(2,95±0,06)·105 and 2=21,8±0,3 at 25°C and =0,02.


Mit 6 Abbildungen  相似文献   

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Zusammenfassung Der Komplex des Ni2+ mit o-Methylbenzamidoxim (oMB), [Ni(oMB)2], wurde mit H2O2 in Anwesenheit von Cu2+ oder unter Luftdurchblasen in alkalischer Lösung mit O2 zu [Ni(oMB)4] oxydiert. Die Ligandenzahl und die Bildungskonstante sindn=4 und lgK=7,33. Die Vierwertigkeit des Nickels wurde analytisch nachgewiesen. Die Oxydation verändert dasoMB nicht, wie aus dem IR-Spektrum ersichtlich ist. Die Geschwindigkeitskonstante istk=36,3 l/mol–1 sec–1 und entspricht einer bimolekularen Reaktion.
Complexes of quadrivalent Ni with o-methylbenzamide oxime
The complex of Ni2+ with o-methylbenzamide oxime [Ni(oMB)2] was oxidized to [Ni(oMB)4] with H2O2 in the presence of Cu2+ or with O2 by air-blowing in alkaline solution. The ligand number and the formation constant aren=4 and lgK=7.33, resp. It was proved analytically that nickel is 4-valent. The IR-spectra showed that the oxidation does not attackoMB. The speed constant isk=36.3 l/mole–1 sec–1, corresponding to a bimolecular reaction.
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Zusammenfassung Die stufenweise Komplexbildung des Co2+ mit o-Methylbenzamidoxim (oMB) gibt in alkalischer Lösung zwei Komplexe, deren Zusammensetzung 11 und 12 ist. Die Bildungskonstanten wurden nach graphisch-logarithmischen Methoden bestimmt. Die Bildungskonstanten sind 1=(4,1±0,6)·104 und 2 = 0,41 bei 25° C und Ionenstärke =1.
Co(II) complexes of o-methylbenzamidoxime
In alkaline solution 11 and 12 complexes are formed stepwise from Co2+ and o-methylbenzamidoxime. The ligand numbers and the formation constants were determined from spectrophotometric data by logarithmic graphical methods. The formation constants are 1=(4,1±0,6)·104 and 2 = 0,41 at 25° C and =1.


Mit 3 Abbildungen  相似文献   

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The preparation of compounds with formula Ni(enac 2) and [Co(enac 2)L 2]X is reported [H2(enac 2)=ethylenediimino-bis-acetylacetone, C12H20N2O2,L=NH3,py, -pic, diethylamine;X=Cl, ClO 4 , B(C6H5) 3 ]. The complexes have been studied by means of magnetic susceptibility measurements, infrared, electronic and NMR spectra and conductivity measurements.  相似文献   

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Phosphaneimine Complexes of Beryllium and Phosphoraneiminato Complexes with Heterocubane Structure Beryllium dichloride reacts with the silylated phosphaneimine Me3SiNPEt3 in dichloromethane solution to give the monomeric donor‐acceptor complex [BeCl2(Me3SiNPEt3)] ( 1 ). Under cleavage of trimethylchlorosilane the thermolysis of 1 at 160 °C leads to the formation of the phosphoraneiminato complex [BeCl(μ3‐NPEt3)]4 ( 2 ) with heterocubane structure. In the presence of BeCl2 1 reacts in the melt to give the phosphoraneiminato complex [Be4Cl43‐Cl)(μ3‐NPEt3)3] ( 3 ), the structure of which corresponds with the structure of 2 by substitution of a ligand (μ3‐NPEt3) by a μ3‐chloro ligand. As a by‐product from the synthesis of 2 in dichloromethane solution the phosphaneimine complex [BeCl2(μ‐HNPEt3)]2·CH2Cl2 ( 4 ·CH2Cl2) can be obtained. Its dimeric units form dimers [{BeCl2(μ‐HNPEt3)}2]2 with symmetry D2 via Cl···H‐N hydrogen bridges. The compounds 1 — 4 ·CH2Cl2 are characterized by X‐ray structure determinations, 1 — 3 additionally by IR spectroscopy. 1 : Space group C2/c, Z = 8, lattice dimensions at 193 K: a = 1502.5(1), b = 801.8(1), c = 2609.6(2) pm, β = 96.15(1)°, R1 = 0.0523. 2 : Space group C2/c, Z = 4, lattice dimensions at 193 K: a = 1992.2(2), b = 1054.8(1), c = 1950.6(2) pm, β = 114.82(1)°, R1 = 0.0275. 3 : Space group P212121, Z = 4, lattice dimensions at 193 K: a = 1159.5(1), b = 1199.0(1), c = 2251.1(2) pm, R1 = 0.0399. 4 ·CH2Cl2: Space group Ccca, Z = 8, lattice dimensions at 193 K: a = 1454.6(1), b = 2795.7(3), c = 1235.6(1) pm, R1 = 0.0349.  相似文献   

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New Complexes of Titanium with Silylated Aminoiminophosphorane and Sulfodiimide Ligands TiCl4 forms a 1 : 1 adduct with S(NSiMe3)2 to give compound 1 and with Me2S(NSiMe3)2 compound 2 , respectively. The reaction of TiCl4 with Ph2S(NSiMe3)2 yields the disubstituted compound Ph2S(NTiCl3)2X4THF 3 which crystallizes in space group P1 . Reaction of TiCl4 with (Me3Si)2NPPh2NPPh2NSiMe3 leads to an exchange of one silyl group with a TiCl3 moiety. In this molecule the Ti-atom is only four-coordinated. The compound crystallizes in the space group P21/c. No chelate complexes are formed by reactions of CpTiCl3, Cp*TiCl3 and Cp*TiF3 with Ph2P(NSiMe3)2H, this is shown by X-ray structural analysis of Cp*TiCl2NPPh2NHSiMe3 6 . Crystals of 6 are obtained in space group P1 .  相似文献   

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New Complexes of Titanium with Bis(trimethylsilyl)amido Ligands The reaction of cp′TiCl3 with LiN(SiMe3)2 · Et2O 1 yield the compounds cp′TiCl2N(SiMe3)2 (cp′ = C5H5 2 , C5H4SiMe3 3 , C5H3(SiMe3)2 4 , C5Me5 5 ) and cp′TiCl[N(SiMe3)2]2 (cp′ = C5H5 6 ). Compound 2 was characterized by an X-ray structural analysis with space group P21/n and unit cell dimensions of a = 1 660.9(7), b = 688.6(3), c = 1 739.1(8) pm and β = 117.18(3)°.  相似文献   

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If a strong base is added to solutions containing complexes of trivalent antimony with aminopolycarboxylates, these ligands are displaced, and oversaturated solutions of antimony (III) hydroxide are formed. This reaction has been used to investigate the formation of complexes of SbIII with the following ligands: N′-hydroxyethyl-ethylenediamine-N,N,N′-triacetate ion, ethylenediamine-N,N,N′,N′-tetraacetate ion, 1,2-diaminocyclohexane-N,N,N′,N′-tetraacetate ion, and diethylenetriamine-N,N,N′,N″,N″-pentaacetate ion.  相似文献   

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