| 1. |
- Nordlander, Ebbe, et al.
(författare)
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The Crystal and Molecular Structure of HOs6(CO)21(NCMe)PH2
- 1997
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Ingår i: Polyhedron. - 0277-5387. ; 16:19, s. 3463-3467
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Tidskriftsartikel (refereegranskat)abstract
- The crystal structure of the phosphide-bridged cluster [Os6(μ-H)(CO)12(NCMe)(μ-PH2)] 4 has been determined. The cluster consists of two Os3 triangles which are linked by a PH2 moiety which is terminally bound to each triangle. The acetonitrile ligand is axially coordinated and the hydride bridges the Os---Os edge to which the phosphide moiety and the acetonitrile are coordinated. The molecular structure of 4 resembles those of the related clusters [Os6(μ-H)(CO)22(μ-PH2)] 1 and [Os6(μ-H)(CO)21(CNBut)(μ-PH2)] 2 although the dihedral angles between the two osmium triangles vary for 1, 2 and 4. The relative orientation of the two linked metal triangles in 4 (as well as 1 and 2) differs from that of the phosphite-substituted analogue [Os6(μ-H)(CO)20{P(OMe)3}2(μ-PH2)]3; this difference is attributed to steric factors.
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| 2. |
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| 3. |
- Ivanov, Alexander V., et al.
(författare)
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Isomorphism of bis(diethyldithiocarbamato)zinc(II) adduct with pyridine, [Zn(Py)(EDtc)2]: hysteresis in the reaction of the adduct formation
- 2002
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Ingår i: Polyhedron. - 0277-5387 .- 1873-3719. ; 21:27-28, s. 2727-3731
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Tidskriftsartikel (refereegranskat)abstract
- The structure of the polycrystalline adduct bis(diethyldithiocarbamato)-pyridine zinc(II) depends on the pathway of physico-chemical conditions during the preparation procedure, as was revealed by solid state 15N CP/MAS spectroscopy in good correlation with known single crystal X-ray diffraction structures of this adduct. Two isomorphs of the adduct, namely α-[Zn(Py)(S2CNEt2)2] and β-[Zn(Py)(S2CNEt2)2], are the two molecules in the asymmetric unit of a single crystal (or polycrystalline) sample that can be obtained by recrystallization from toluene of the equimolar solution of the initial diethyldithiocarbamate zinc(II) complex and pyridine. The third isomorph, γ-[Zn(Py)(S2CNEt2)2], can be obtained by recrystallization from pure pyridine of the diethyldithiocarbamate zinc(II) complex, or by its equimolar absorption of pyridine, or by desorption of pyridine from the clathrated adduct, [Zn(Py)(S2CNEt2)2]·Py. Finally, the γ-[Zn(Py)(S2CNEt2)2] isomorph recrystallizes from the melt into α/β-isomorphs of the adduct.
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| 4. |
- Ivanov, Alexander V., et al.
(författare)
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Rotation isomers of bis(diethyldithiocarbamato)zinc(II) adduct with pyridine, Zn(EDtc)(2)center dot Py: ESR, C-13 and N-15 CP/MAS NMR and single-crystal X-ray diffraction studies
- 1999
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Ingår i: Polyhedron. - 0277-5387 .- 1873-3719. ; 18:15, s. 2069-2078
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Tidskriftsartikel (refereegranskat)abstract
- The adduct of bis(diethyldithiocarbamato)zinc(II) with pyridine, Zn(EDtc)2·Py, was prepared and studied by means of ESR (63Cu2+ and 65Cu2+ were used as spin labels), solid-state natural abundance 13C and 15N CP/MAS NMR spectroscopy and single-crystal X-ray diffraction data analysis. Two rotation isomers of the adduct were unambiguously determined by these three independent methods. It was found that these two isomers have different orientations of the pyridine ring about the N(Py)-Zn axis. The acute angles of the plane of the pyridine molecules relative to the most weak Zn-S bond are equal to 45.6 and 52.7° in the different isomers. Adduct molecules adopt a geometry which is intermediate between the square pyramidal (C4v) and the trigonal bipyramidal (D3h). All ESR and NMR resonances of Zn(EDtc)2·Py were assigned
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| 5. |
- Ivanov, Alexander V., et al.
(författare)
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Structural organisation of [Ni(II)--Me(II)--Dtc] (Me = Zn, Cd, Hg) Dithiocarbamate complexes : ESR, 13C and 15N CP/MAS NMR studies
- 1998
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Ingår i: Polyhedron. - 0277-5387 .- 1873-3719. ; 17:18, s. 3101-3109
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Tidskriftsartikel (refereegranskat)abstract
- Magnetically diluted systems of dithiocarbamate complexes of the type 63,65Cu/[Ni(II)--Me(II)--Dtc] (Me = Zn, Cd, Hg; Dtc = MDtc (dimethyl-) or EDtc (diethyldithiocarbamate)), which model the structural heterogeneity on the local, molecular and supramolecular levels, have been prepared and studied by means of ESR and solid state 13C and 15N CP/MAS NMR spectroscopy.
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| 6. |
- Kloo, Lars, et al.
(författare)
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The nature of subvalent gallium and indium in aqueous media
- 2002
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Ingår i: Polyhedron. - 0277-5387 .- 1873-3719. ; 21:5-6, s. 519-524
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Tidskriftsartikel (refereegranskat)abstract
- Subvalent gallium can exist in aqueous solutions as Ga-Ga bonded gallium(II) species stabilised by halide ligands in the form of the complex anions Ga2X62- (X = Cl, Br or I) whose formation and reactivity are discussed. Gallium(I) compounds and mixed valence compounds of gallium react vigorously with water, converting any Ga+ ions into Ga(III) products. Indium(I) is more tolerant of water, so that perchlorate and other non-complexing aqueous media can support In+ ions at concentrations up to 10(-3) mol l(-1) before disproportionation to In(0) and In(III) occurs. Subvalent indium concentrations of approximately 10(-1) mol l(-1) are attained in halogen acid solution, particularly HBr which yields red, solid InBr upon dilution. Spectroscopic data suggest the precursor is an In(II)-In(II) bromide complex (probably In2Br62-) capable of breaking up into In(I) and In(III) products.
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| 7. |
- Käll, Per-Olov, et al.
(författare)
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Synthesis, structure determination and X-ray photoelectron spectroscopy characterisation of a novel polymeric silver(I) nicotinic acid complex, H[Ag(py-3-CO2)2]
- 2001
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Ingår i: Polyhedron. - 0277-5387 .- 1873-3719. ; 20:21, s. 2747-2753
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Tidskriftsartikel (refereegranskat)abstract
- Polymeric inorganic or organometallic coordination compounds represent an interesting class of materials where novel (combinations of) electrical, optical, magnetic, catalytic, or other properties are expected to occur. It has recently been shown that Ag1 complexes formed by organic N,N'-bidentate type ligands exhibit a rich structural variety encompassing ID, 2D and 3D polymers. Previous investigations of the silver(I) nicotinic acid system have revealed two different structural types, in both of which Ag1 is three-coordinated. We have investigated the system nicotinic acid (C6H5NO2/AgA in water (A = NO3-, CH3COO- and F-). In all the cases the same product precipitated, catena-{hydrogen bis[pyridine-3-carboxylato-(N,N')]silver(I)}, H[Ag(py-3-CO2)2] (M = 353.1 g mol-1). The structure can be described as a 1D polymer consisting of [Ag(C6H4NO2)2]- monomers linked via C21(12)[R21(4)] hydrogen bonds, where the connecting H+ ion is located at the same distance (1.24 Å) to the carboxyl oxygens of consecutive monomers. The measured X-ray photoelectron spectrum shows an excellent agreement with the proposed structure. FTIR measurements of the complex were also performed. © 2001 Elsevier Science Ltd. All rights reserved.
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| 8. |
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| 9. |
- Zhang, Xuanjun, et al.
(författare)
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Zn(II) and Cd(II) N-carbazolylacetates with strong fluorescence
- 2003
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Ingår i: Polyhedron. - : Elsevier. - 0277-5387 .- 1873-3719. ; 22:3, s. 397-402
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Tidskriftsartikel (refereegranskat)abstract
- N-carbazolylacetic acid was synthesized using a new method in a high yield and two carbazolylacetato complexes [Zn(Cabo)-(phen)2ClO4]·0.5C2H5OH and [Cd(Cabo)(phen)2-ClO4] (Cabo=N-carbazolylacetate, phen=1,10-phenanthroline) were synthesized and characterized by elemental analysis, IR, UV–Vis spectra, thermal analyses, photoluminescence measurement and X-ray diffraction studies. Both of the complexes exhibit strong blue emission in solid state as well as high thermal stability and solvent-resistant properties.
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| 10. |
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