共查询到20条相似文献,搜索用时 0 毫秒
1.
The complex of silver(I) with the condensation product of benzaldehyde and 3-(pyridin-2-yl)-5-(2-aminophenyl)-1 H-1,2,4-triazole (L), [AgL 2]NO 3 ( I), was synthesized. The reaction of L with silver(I) nitrate was found to afford 2-(2′-pyridyl)-1,4-dihydro- 5H-1,3,4-benzotriazepin-5-one along with complex I. The compounds synthesized were characterized by X-ray diffraction analysis. 相似文献
2.
Summary The reactions of 2,2-biquinoline(biq) with M(PhCN) 2X 2 (M=Pd; X=Cl or Br; M=Pt, X=Cl, Br or I), K 2PtCl 4 and RhCl 3·3H 2O and of 2-(2-pyridyl)quinoline (pq) with K 2PtCl 4 and RhCl 3·3H 2O have been investigated. The isolated complexes cis-[Pd(biq)X 2] (X=Cl or Br), cis-[Pt(biq)Cl 2], cis-[Pt(biq)Cl 2]·H 2O, trans-[Pt(biq) 2Br 2]·5H 2O, [Pt 3(biq) 2I 6], mer-[Rh(biq)Cl 3-(H 2O)] and mer-[Rh(pq)Cl 3(H 2O)] have been characterized by elemental analyses, conductivity measurements, i.r., electronic, and 1H n.m.r. spectra. The reaction of pq with K 2PtCl 4 in 1M H 2SO 4 gave the salt 2-(2-pyridyl) quinolinium tetrachloroplatinate(II) pentahydrate, (pqH) 2[PtCl 4]·5H 2O; when the reaction was carried out in aqueous acetone, cis-[Pt(pq)Cl 2] was obtained. A new method for the synthesis of cis-[Rh(biq) 2X 2]X (X=Cl or Br) is described; both compounds have been further characterized by 1H n.m.r. 相似文献
3.
The new N,N,O-ligand 6-phenyl-3-(2-pyridyl)-5-(trifluoroacetylmethylidene)-4,5-dihydro-1,2,4-triazine (L) was synthesized, and its complex
with Cu II was prepared. The structure of the complex was established by X-ray diffraction. Magnetic measurements and ESR studies were
carried out. Ab initio calculations of the electronic structure, exchange interactions, and the effective magnetic moment were performed. The intrastack
polarization effect between the π states of 1,2,4-triazine and the d states of copper was revealed and numerically validated.
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 3, pp. 549–554, March, 2008. 相似文献
4.
Starting from cis-[Ru(dcbpyH 2) 2Cl 2] ( 1), two new heteroleptic ruthenium(II) complexes, [Ru(dcbpyH 2) 2(L 1)](NO 3) 2 (L 1?=?2-(2′-pyridyl)quinoxaline ( 2), and [Ru(dcbpyH 2) 2(L 2)](NO 3) 2 (L 2?=?4-carboxy-2-(2′-pyridyl)quinoline ( 4); dcbpyH 2?=?2,2′-bipyridine-4,4′-dicarboxylic acid), were synthesized and spectroscopically characterized. During the preparation of 2 and 4, the homoleptic [Ru(dcbpyH 2) 3]Cl 2 complex ( 3) was isolated as a side product. Characterization includes IR and Raman spectroscopy, UV-Vis, multinuclear NMR spectroscopy, elemental, and ESI-mass spectrometric analyses. 相似文献
5.
The conformational state of two benzo-crown ethers with substantially different physiological activity, 2,3-(4-phenylacetyl)- and 2,3-(4-diphenylacetyl)benzo-15-crown-5, was studied in crystals and solutions in CH 3CN and CCl 4 by x-ray crystallographic analysis, IR spectroscopy, and conformational calculations by the method of molecular mechanics. Transition from the crystalline state to solutions was found to be accompanied by a substantial change in the conformation of the macrocyclic ring of all the compounds studied. The nature of the substituent in the benzene ring and the polarity of the solvent have an influence on the conformational state of the macrocyclic ring of the free ligand, which, however, is not the determining factor in the change in the activity of the compounds. The COCCOC fragments of the macrocyclic framework are conformationally labile, readily passing from gauche to trans conformations and the reverse, which is promoted by the negligible energy barriers between the different conformations, determined in the work by a molecular mechanics method.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 8, pp. 1819–1825, August, 1991. 相似文献
6.
Complexes of iron(III) with ethylene glycol and 3(2′-hydroxyphenyl)-5-(4′-substituted phenyl) pyrazolines, [Fe(OCH 2CH 2O)(C 15H 12N 2OX)] m ? nH 2O and [Fe(C 15H 12N 2OX) 2(OCH 2CH 2OH)] (where OCH 2CH 2O and OCH 2CH 2OH = ethylene glycol moiety; C 15H 12N 2OX = 3(2′-hydroxyphenyl)-5-(4-X-phenyl)pyrazoline; X = H, CH 3, OCH 3, or Cl; m = 2–3 and n = 2–3) have been synthesized and characterized by elemental analysis (C, H, N, Cl, and Fe), molecular weight measurement, magnetic moment data, thermogravimetric analysis, molar conductance, spectral (UV-Vis, IR, and FAB mass), scanning electron microscopy, and X-ray diffraction studies. Bonding of ethylene glycol and pyrazolines in these complexes and the particle size of iron(III) complexes are discussed. Antibacterial and antifungal potential of free pyrazoline and some iron(III) complexes are also discussed. 相似文献
7.
N,N′-bis(m-ethoxycarbonylphenyl)urea and its complex compounds with cooper, zinc and cadmium were syntesized. The structure of N,N′-bis( m-ethoxycarbonylphenyl)urea was investigated by XRD method. Ligand coordination process was determined. Some factors affecting the donor ability of the nitrogen and oxygen atoms in ligand molecule were discussed. 相似文献
8.
The molecular structure, conformational equilibria, vibrational spectra and molecular force field of 1-methyl-2-(2′-pyridyl)benzimidazole have been determined at the HF, MP2 and DFT/(B3LYP, BVP86) levels with 6-31+G(d,p) and TZVP basis sets. The torsional potentials for the rotation around the C1–C2 pivotal bond have been calculated at the B3LYP/6-31+G(d,p) and BVP86/TZVP levels of theory for gaseous and aqueous 1-methyl-2-(2′-pyridyl)benzimidazole. FT-Raman (3500–10 cm?1) and FT-IR (3900–400 cm?1) spectra of solid 1-methyl-2-(2′-pyridyl)benzimidazole have been recorded and interpreted on a base of calculated potential energy distribution. The results of the experimental and theoretical study of vibrational spectra and molecular structure of 1-methyl 2-(2′-pyridyl)benzimidazole are considered in comparison with similar data for 2-(2′-pyridyl)benzimidazole. 相似文献
9.
Journal of Structural Chemistry - The structures of iron(III) and nickel(II) complexes with the composition [FeL2]Cl·H2O (1) and [Ni(HL′2)]·DMSO·0.5H2O (2), where L and... 相似文献
10.
Summary 5 -Benzoyl-2 -hydroxychalcones were synthesized by the condensation of 5 -benzoyl-2 -hydroxyacetophenone with aromatic aldehydes in presence of an ethanolic solution of potassium hydroxide. Derivatives of 6-benzoylflavonoids were prepared from chalcones. 相似文献
13.
Structural Chemistry - 相似文献
14.
Representatives of a new class of mesogenic compounds have been synthesized, -(5-substituted-2-pyridyl)-4-alkylacetophenones, which have an intramolecular hydrogen bond. The mesogenic properties of these compounds have been investigated.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 4, pp. 486–488, April, 1993. 相似文献
16.
A novel europium(III) coordination polymer [Eu(Sip)(H 2O) 5] n · nH 2O · 1.5 n(Bipy) ( I) (Sip is 5-sulfo-isophthalate trivalent anion and Bipy is 4,4-bipyridine) is hydrothermally synthesized and determined by the single crystal X-ray diffraction method. Polymer I crystallizes in the monoclinic system, space group C2/ c with a=30.7515(6) , b=10.9577(2) , c=17.5545(4) , =112.040(1)°, V=5483.0(2) 3, Z=4, final R
1=0.0253 and wR
2=0.0606. In I, each Eu 3+ ion is coordinated by four oxygen atoms from two carboxylate groups of two different Sip anions and five oxygen atoms from five coordinated water molecules to complete a deformed monocap square antiprism. Moreover, each Sip anion acts as a tetradentate ligand to connect two adjacent Eu 3+ ions through its two chelating carboxylate groups, resulting in one-dimensional linear chains. In addition, fifteen different kinds of hydrogen-bonding interactions link the chains, lattice water molecules, and free Bipy molecules to engender a complicated hydrogen-bonding network.__________From Koordinatsionnaya Khimiya, Vol. 31, No. 5, 2005, pp. 391–396.Original English Text Copyright © 2005 by Hu Mao Lin, Cai Xiao Qing, Miao Qian, Xiao Hong Ping.This text was submitted by the authors in English. 相似文献
17.
Complexes of transition metal ions with the oxygen-nitrogen containing ligand 1,3-bis(2-pyridyl)-1,3-propanedione (bpypH) have been synthesized. These present stoichiometries which do not conform with the usual tendency manifested by β-diketones, since molecular formulas with the composition M(bpyp)X are found. A nitrogen methylated ligand N,N′-dimethyl-1,3-bis(2-pyridyl)-1,3-propanedione methyl sulphate [dimebpypH] (MeSO 4) 2 has also been synthesized and its complexes with transition metal ions studied. The stoichiometries now, resemble those of typical β-diketones, namely [dimepyp] 2MX 4 with four anions because of the dicationic nature of the original ligand. This, together with IR evidence suggests a dual type of coordination by bpip via the β-diketone and the pyridyl moieties. 相似文献
18.
2-(2′-Pyridyl)benzimidazole (PBIMH) was functionalized onto chloromethylated polystyrene beads crosslinked with 6.5 % divinylbenzene, and this solid support was then reacted with Na 2PdCl 4 in methanol. The functionalized beads were then activated using sodium borohydride. The resultant polymer-supported [2-(2′-pyridyl)benzimidazole]palladium complex (PSDVB–PBIM–PdCl 2) and its activated form were characterized by various physicochemical techniques. XPS studies confirmed the +2 oxidation state of palladium in the supported complex. The activated complex was found to catalyse the hydrogenation of various organic substrates including olefins, nitro and Schiff base compounds. Kinetic measurements for the hydrogenation of cyclopentene, cyclohexene and cyclooctene were carried out by varying temperature, catalyst and substrate concentration. The energy and entropy of activation were evaluated from the kinetic data. The catalyst showed an excellent recycling efficiency over six cycles without leaching of metal from the polymer support, whereas the unsupported complex was unstable as metal leached out into the solution during the first run. 相似文献
19.
The proton dissociation constant of 5-(4-sulfonylazidophenylazo)-3-phenyl-2-thio- xothiazolidin-4-one (SPT) and the stability constants of its complexes with some metal ions were calculated potentiometrically in 0.1 M KCl and 40% (v/v) ethanol–water mixture. The order of stability was found to be Mn 2+ < Co 2+ < Ni 2+ < Cu 2+ < Zn 2+. The effect of temperature on the dissociation of SPT and the stability of its complexes were studied. The corresponding thermodynamic functions were derived and discussed. The dissociation process is unspontaneous, endothermic, and entropically unfavorable. The formation of the metal complexes was found to be spontaneous, endothermic and entropically favorable. 相似文献
20.
Some new Cr(III) compounds with uracil, uridine and 5′-UMP were obtained by reaction of the starting complexes cis-[Cr(en) 2Cl 2]Cl and [Cr(NH 3) 5Cl]Cl 2 with the base, nucleoside and nucleotide. The complexes were characterized by their elemental analysis, conductivity, reflectance and IR data. In the case of uracil and uridine compounds, indirect bonding of Cr(III) to the pyrimidine ring seems to occur through the C 4O and NH 3(NH 2) groups of the starting complexes. In the 5′-UMP complex direct bonding is inferred through the phosphate group with additional interactions by hydrogen bonds involving the C 4O group. 相似文献
|