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Lei Li 《Inorganica chimica acta》2010,363(4):748-55
Three Cd (II)-M (II) hetero-nuclear coordination polymers, [FeCd2(Hcit)2(H2O)2]n (1), [CoCd2(BTC)2(H2O)4]n (2) and [Cd3(Hcit)2(H2O)2]n (3) (H4cit = citric acid, H3BTC = 1,3,5-benzenetricarboxyl acid), were synthesized through hydrothermal method. They were characterized through elemental analysis, IR spectra, UV-Vis absorption spectra, X-ray powder diffraction, single-crystal X-ray diffraction and surface photovoltage spectra (SPS). Structural analysis indicates that 1 and 3 possess 2D structures, which are further connected to 3D structures by hydrogen bonds. 2 is a 3D Cd-Co coordination polymer bridged by BTC3− groups. The SPS show that 1 and 2 present positive photovoltage response in 300-550 nm, but the photovoltage response of 3 appears in 300-400 nm. It is indicated that the limits of SPS response bands of polymers 1 and 2 are wider than those of 3 because of introduction of the other transition metal ions. There is a good corresponding relationship between SPS and UV-Vis absorption spectra. 相似文献
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Corrado Di Nicola Claudio Pettinari Brian W. Skelton Allan H. White 《Inorganica chimica acta》2005,358(3):695-706
Single crystal X-ray structural characterizations are recorded for an array of adducts of the form AgX:dppf (1:1)(n), X = simple (pseudo-)halide or oxy-anion, ‘dppf’ = bis(diphenyl phosphino)ferrocene, for adducts X = Cl (new phase), Br, I, SCN, OCN, CN, NO3 (new phase), O2CCH3, n = 2, the form being dimeric [(dppf-P,P′)Ag(μ-X)2Ag(P,P′-dppf)], for X = I, SCN, [Ag(μ-X)2(P-dppf-P′)2Ag′]; for X = O2CCF3, n = ∞, the form is an extended polymer: ?Ag(O · CO · CF3)(P-dppf-P′)Ag′(O?. A dichloromethane solvate phase of CuI:dppf (1:1)2 (also centrosymmetric) is also recorded. Synthetic procedures for all adducts have been reported. All compounds have been characterized both in solution (1H, 13C, 31P NMR, ESI MS) and in the solid state (IR). The topology of the structures in the solid state was found to depend on the nature of the counterion. 相似文献
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A new high-yield preparative route to (por)Ru(NO)Cl compounds (por = porphyrinato dianion) from reactions of (por)Ru(NO)(alkoxide) precursors with boron trichloride is reported. These ruthenium nitrosyl chloride complexes are known to be useful precursors to (por)Ru(NO)-containing derivatives. The crystal structure of (OEP)Ru(NO)Cl (OEP = octaethylporphyrinato dianion) shows that the RuNO linkage is linear. The redox behavior of the (por)Ru(NO)Cl compounds has been determined by cyclic voltammetry. Analysis of the data reveals that the first oxidation of the (por)Ru(NO)Cl compounds is porphyrin-ring centered. 相似文献
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F. Cristiani D. De Filippo P. Deplano F. Devillanova A. Diaz E.F. Trogu G. Verani 《Inorganica chimica acta》1975,12(1):119-122
Complexes of the type M(CO)3(22cy), where M = Cr, Mo, W and 22cy = 2,2-para-cyclophane were prepared and characterised. The i.r., p.m.r., mass spectrography spectra are discussed. The Mo derivative decomposes in solution giving 22cy, Mo(CO)6 and Mo, according to a first order mechanism. 相似文献
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Corrado Di Nicola Claudio Pettinari Brian W. Skelton Allan H. White 《Inorganica chimica acta》2006,359(1):53-63
Single crystal X-ray studies have defined the structures of a number of adducts of the form MX:dpex (2:1), M = univalent coinage metal (Cu, Ag), X = (pseudo-)halide, dpex = bis(diphenylpnicogeno)alkane, Ph2E(CH2)xEPh2, E = P, As, of diverse types, some novel. The adducts of AgCl,Br:dppm and AgNCO:dpem (x = 1) are tetranuclear as is the AgNO3:dppp (x = 3) array, all derivative of the familiar ‘step’ structure while the combination CuCN:dppm yields a two-dimensional web of twenty-membered macro/metallacycles. Synthetic procedures for all adducts have been reported. All compounds have been characterized both in solution (1H, 13C, 31P NMR, ESI MS) and in the solid state (IR). 相似文献
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Studies reported here were undertaken to gain greater molecular insight into the complex structure of mitochondrial ATP synthase (F(0)F(1)) and its relationship to the enzyme's function and motor-related properties. Significantly, these studies, which employed N-terminal sequence, mass spectral, proteolytic, immunological, and functional analyses, led to the following novel findings. First, at the top of F(1) within F(0)F(1), all six N-terminal regions derived from alpha + beta subunits are shielded, indicating that one or more F(0) subunits forms a "cap." Second, at the bottom of F(1) within F(0)F(1), the N-terminal region of the single delta subunit and the C-terminal regions of all three alpha subunits are shielded also by F(0). Third, and in contrast, part of the gamma subunit located at the bottom of F(1) is already shielded in F(1), indicating that there is a preferential propensity for interaction with other F(1) subunits, most likely delta and epsilon. Fourth, and consistent with the first two conclusions above that specific regions at the top and bottom of F(1) are shielded by F(0), further proteolytic shaving of alpha and beta subunits at these locations eliminates the capacity of F(1) to couple a proton gradient to ATP synthesis. Finally, evidence was obtained that the F(0) subunit called "F(6)," unique to animal ATP synthases, is involved in shielding F(1). The significance of the studies reported here, in relation to current views about ATP synthase structure and function in animal mitochondria, is discussed. 相似文献
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PHA-stimulated human lymphocytes (normal-resting-proliferating) at 0, 24, 48, 72, and 144 h were studied with Acridine Orange (AO) staining. By viable cell sorting, by subsequent subculturing, and by the use of biochemical, biophysical, and immunological assays, not only have the G0 resting and G1 (cycling) cell cycle phases been objectively characterized, but a separate subpopulation of quiescent cells that are functionally viable and deeply committed to nonproliferation, the Q cells, has been identified. Multiparameter cytofluorimetric analysis, methyl14C-thymidine incorporation, automated image analysis, and mitogen stimulation studies have shown that the "Q" cell, compared to the "G0" resting but easily recruitable cell, exhibits quite lower red and green AO emission, possesses 2c to 4c DNA content (rather than only 2c), has a higher average optical density, and is either nonrecruitable or recruitable-with-difficulty in PHA-stimulated lymphocyte cultures. 相似文献
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An analysis of literary data concerning the physico-chemical properties of the hydrophobic fragment of bacterial, mitochondrial and chloroplast ATP-synthases has been carried out. The distribution patterns of enzyme subunits and of the whole enzyme complex are reviewed on the basis of amino acid analysis data taking account of physico-chemical characteristics of constituent amino acids. The roles of subunits, their invariant and other amino acids in the hydrophobic fragment function are discussed. 相似文献
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C. Babin 《Marine Micropaleontology》1986,10(4)
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Stefan Dilsky Jacob A. Rubin Robert D. Pike Joseph M. Keane 《Inorganica chimica acta》2007,360(7):2387-2396
A variety of Group 6 mono bipyridine (bpy) complexes were prepared, and substitution reactions of [(bpy)(MeIm)M(CO)2(NO)]PF6 complexes (MeIm = 1-methylimidazole, M = W or Mo) were investigated. Nitrosylation of complexes having the general formula (bpy)(L)M(CO)3 (L = a variable ligand) gave cationic complexes of the form [(bpy)(L)M(CO)2(NO)]PF6. The structure of [(bpy)(MeIm)W(CO)2(NO)]PF6 was confirmed by single-crystal X-ray diffractometry. [(bpy)(MeIm)M(CO)2(NO)]PF6 complexes undergo facile substitutions with mono-, tri- and tetra-dentate ligands, yielding di- or mono-carbonyl mononitrosyl complexes. The structures of [(bpy)(PMe3)2W(CO)(NO)]PF6 and [(dien)(PMe3)W(CO)(NO)]PF6 (dien = diethylenetriamine) were determined by X-ray diffraction. 相似文献
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