Synthesis and structural characterization of rhenium(I) tricarbonyl complexes with the bidentate ligands o-(diphenylphosphino)benzaldehyde (P∩O) and o-[(diphenylphosphino)benzylidene]analine (P∩N)

A new series of La(III) complexes of the ligand with the general formula [La(L)2(a)3] and [La2(L)4(aa)3], (a = nitrate (1), thiocyanate (2), acetate (3) and propionate (4) ions, aa = sulphate (5), thiosulphate (6), oxalate (7) and malonate (8) ions with the ligand 4-nitrosoantipyrine (L) were synthesized and characterized using various physico-chemical studies. The primary ligand L acts as a bidentate ligand utilizing the carbonyl group and the nitroso group for bonding. The nitrate, thiocyanate, acetate and propionate ions are monovalent unidentate ligands, whereas sulphate, thiosulphate, oxalate and malonate ions are divalent bidentate ligands in the complexes 1-8. Based on spectral data and magnetic susceptibility measurements, geometry of the lanthanum(III) complexes were also proposed.

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Reaction of [CpRu(CH3CN)3]PF6 with bidentate ligands: structural characterization of [{CpRu(CH3CN)2}2(μ-η1:1-dppe)](PF6)2 [dppe=1,2-bis(diphenylphosphino)ethane]

Journal of Organometallic Chemistry ◽

10.1016/j.jorganchem.2004.02.035 ◽

2004 ◽

Vol 689 (10) ◽

pp. 1757-1762 ◽

Cited By ~ 7

Author(s):

Massimo Di Vaira ◽

Stefano Seniori Costantini ◽

Fabrizio Mani ◽

Maurizio Peruzzini ◽

Piero Stoppioni

Keyword(s):

Structural Characterization ◽

Bidentate Ligands

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Synthesis and structural characterization of isomeric palladium(II) complexes with chiral N,O-bidentate ligands

Inorganica Chimica Acta ◽

10.1016/j.ica.2013.02.023 ◽

2013 ◽

Vol 400 ◽

pp. 262-266 ◽

Cited By ~ 8

Author(s):

Takashi Tsuno ◽

Haruka Iwabe ◽

Henri Brunner

Keyword(s):

Structural Characterization ◽

Bidentate Ligands

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Lewis-Base Adducts of Group 11 Metal(I) Complexes. XXXV. Complexes of the Asymmetric Bidentate Ligands (L) 2-Aminomethylpyridine and 2-Hydrazinopyridine With Copper(I) Halides: Syntheses and Structural Characterization of [CuL2]+X-, X = Cl, Br, I

Australian Journal of Chemistry ◽

10.1071/ch9880623 ◽

1988 ◽

Vol 41 (5) ◽

pp. 623 ◽

Cited By ~ 7

Author(s):

PC Healy ◽

JD Kildea ◽

BW Skelton ◽

AH White

Keyword(s):

Hydrogen Bonding ◽

Structural Characterization ◽

Lewis Base ◽

Donor Group ◽

Bidentate Ligands ◽

Halide Anion ◽

Nitrogen Bases ◽

Ionic Complexes ◽

Nitrogen Donor

The 1:2 adducts of the copper(I) halides (CuX ; X = Cl, Br, I) with the aliphatic/aromatic bidentate nitrogen bases 2-aminomethylpyridine, H2NCH2.C5H4N, and 2-hydrazinopyridine, H2N.NH.C5H4N, L, have been synthesized by recrystallization of stoichiometric copper(I) halide/base solutions from acetonitrile . In all cases, ionic complexes [CuL2]+ X- are obtained, copper being four-coordinated by a pair of bidentate ligands, and with widely varying distortions from ideal 2 symmetry. Cu-N (aromatic) in the 2-aminomethylpyridine adducts range from 1.979(8) to 2.037(5)Ǻ; while Cu-N(H2) are 2.102(9)-2.172(10)Ǻ, N( Ar )-Cu-N( Ar ) angles [130.7(2)-143.2(4)°] are larger than N(H2)-Cu-N(H2)[114.8(2)-116.3(4)°]. Comparable values for the 2-hydrazinopyridine complexes are 1.95(1)-2.036(5), 2.085(4)-2.214(7)Ǻ; 124.1(2)-140.8(4), 94.5(3)-128.0(3)°. In no case does the halide anion coordinate to the copper, displacing the aliphatic nitrogen donor group; rather it is stabilized in the crystal lattice by strong NH2…X hydrogen bonding.

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New ultrastructural findings about Borrelia burgdorferi by cryofixation, negative staining, thin sectioning and scanning techniques

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100160467 ◽

1990 ◽

Vol 48 (3) ◽

pp. 582-583

Author(s):

S. F. Hayes ◽

M. D. Corwin ◽

T. G. Schwan ◽

D. W. Dorward ◽

W. Burgdorfer

Keyword(s):

Lyme Disease ◽

Borrelia Burgdorferi ◽

Structural Characterization ◽

Negative Staining ◽

Low Speed ◽

Thin Sectioning ◽

Ultrastructural Findings

Characterization of Borrelia burgdorferi strains by means of negative staining EM has become an integral part of many studies related to the biology of the Lyme disease organism. However, relying solely upon negative staining to compare new isolates with prototype B31 or other borreliae is often unsatisfactory. To obtain more satisfactory results, we have relied upon a correlative approach encompassing a variety EM techniques, i.e., scanning for topographical features and cryotomy, negative staining and thin sectioning to provide a more complete structural characterization of B. burgdorferi.For characterization, isolates of B. burgdorferi were cultured in BSK II media from which they were removed by low speed centrifugation. The sedimented borrelia were carefully resuspended in stabilizing buffer so as to preserve their features for scanning and negative staining. Alternatively, others were prepared for conventional thin sectioning and for cryotomy using modified procedures. For thin sectioning, the fixative described by Ito, et al.

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