Complexation of 3,4-bis(cyanamido)cyclobutane-1,2-dione dianion with copper. Crystal structures and spectroscopic data of copper-(I) and -(II) complexes

2001 ◽  
pp. 1529-1536 ◽  
Author(s):  
Paul-Louis Fabre ◽  
Anne Marie Galibert ◽  
Brigitte Soula ◽  
Françoise Dahan ◽  
Paule Castan
Keyword(s):  
Crystal Structures ◽  
Spectroscopic Data ◽  
Copper Crystal

Synthese und Kristallstrukturen einiger Tetramethylstibonium-Hydrogendicarboxylate / Synthesis and Crystal Structures of Some Tetramethylstibonium Hydrogendicarboxylates

1982 ◽  
Vol 37 (11) ◽  
pp. 1393-1401 ◽  
Author(s):  
Beatrix Milewski-Mahrla ◽  
Hubert Schmidbaur
Keyword(s):  
Hydrogen Bonds ◽  
Crystal Structures ◽  
Spectroscopic Data ◽  
Molar Ratio ◽  
Ionic Structure ◽  
X Ray Diffraction ◽  
X Ray ◽  
Carboxylate Oxygen ◽  
Donor Acceptor ◽  
New Compounds

Reactions of pentamethylantimony (CH3)5Sb with carboxylic acids in the molar ratio 1:2 afford one equivalent of methane and essentially quantitative yields of crystalline tetramothylstibonium hydrogendicarboxylates. Six new compounds of this series have been synthesized using benzoic, o-phthalic, salicylic, 4-ethoxy-salicylic, oxalic, and malic acid, and characterized by analytical and spectroscopic data. An ionic structure with strong hydrogen bonds in the anionic components is proposed.The crystal structures of the hydrogen-dibenzoato (1), hydrogen-ortho-plithalato (2) and 4-ethoxy-hydrogen-salicylate (3) were determined by single crystal X-ray diffraction. The compounds can be described as having ionic lattices with some donor-acceptor inter­actions between the stibonium centers and the carboxylate oxygen atoms. The anions are characterized by strong hydrogen bonds O...H...O. Thus, the (CH3)4Sb-tetrahedron in 1 is distorted by two benzoate oxygon atoms (at 304(2) and 340(2) pin). The cation in 2 is largely undistorted and the anion has a hydrogenphthalate hydrogen bond of d(O...H...O) = 232 pm. The cation-anion contact in 3 is as short as d(Sb-O) = 289 pm rendering the Sb atom pentacoordinate.

scholarly journals Sesquiterpene Lactones from Inula oculus-christi

2010 ◽  
Vol 5 (4) ◽  
pp. 1934578X1000500 ◽  
Author(s):  
Mahmoud Mosaddegh ◽  
Maryam Hamzeloo Moghadam ◽  
Saeedeh Ghafari ◽  
Farzaneh Naghibi ◽  
Seyed Nasser Ostad ◽  
...  
Keyword(s):  
Cytotoxic Activity ◽  
Crystal Structures ◽  
Spectroscopic Data ◽  
Sesquiterpene Lactones ◽  
X Ray ◽  
X Ray Crystallography ◽  
First Time

Inula oculus-christi L. (Compositae) extract was chromatographed and three sesquiterpene lactones ergolide, gaillardin and pulchellin C were isolated. The structures of these compounds were determined by analysis of their spectroscopic data, and their crystal structures were defined using X-ray crystallography; the isolation of ergolide and pulchellin C is reported for the first time from this species. These three compounds were evaluated for their in vitro cytotoxic activity against MDBK, MCF7 and WEHI164 cells; ergolide and gaillardin exhibited lower and significantly different IC50 values compared with pulchellin C ( p<0.001).

Synthesis and crystal structures of theracemicandmesoforms of [1-{1′-4′-cyclopentadienyl-4′-cobalta-1′,12′-dicarba-closo-dodecaboranyl(10)}-4-cyclopentadienyl-4-cobalta-1,12-dicarba-closo-dodecaborane(10)], the former as its tetrahydrofuran disolvate

2015 ◽  
Vol 71 (9) ◽  
pp. 793-798 ◽  
Author(s):  
Dipendu Mandal ◽  
Wing Y. Man ◽  
Georgina M. Rosair ◽  
Alan J. Welch
Keyword(s):  
Crystal Structures ◽  
Spectroscopic Data ◽  
Cyclopentadienyl Ligands ◽  
Centroid Distance ◽  
Steric Crowding

Bothrac-[1-(1′-4′-Cp-4′,1′,12′-closo-CoC2B10H11)-4-Cp-4,1,12-closo-CoC2B10H11]·2THF (Cp is cyclopentadienyl and THF is tetrahydrofuran) or [Co2(C5H5)2(C4H22B20)]·2C4H8O, (1), andmeso-[1-(1′-4′-Cp-4′,1′,12′-closo-CoC2B10H11)-4-Cp-4,1,12-closo-CoC2B10H11] or [Co2(C5H5)2(C4H22B20)], (2), were prepared by thermolysis of arac/mesomixture of the precursor species [1-(1′-4′-Cp-4′,1′,6′-closo-CoC2B10H11)-4-Cp-4,1,6-closo-CoC2B10H11] and were separated, spectroscopically characterized and studied crystallographically. Cage C-atom identification was accomplished by both thevertex-to-centroid distanceandboron–hydrogen distancemethods, and, in both cases, the structure established crystallographically is fully consistent with the spectroscopic data. Both therac-(1) andmeso-(2) forms share the same overall conformation (Co—C—C′—Co′ca136°) and show clear evidence of intramolecular steric crowding resulting in tilted cyclopentadienyl ligands.

Pd(II) and Pt(II) Complexes of 1,2-Bis(pyridin-2-yl)ethane-N,N'

1994 ◽  
Vol 49 (6) ◽  
pp. 844-848 ◽  
Author(s):  
A. McFarlane ◽  
J. R. Lusty ◽  
J. J. Fiol ◽  
A. Terrón ◽  
E. Molins ◽  
...  
Keyword(s):  
Crystal Structures ◽  
Spectroscopic Data ◽  
Low Energy ◽  
X Ray ◽  
H Nmr ◽  
Direct Bond ◽  
Structures And Properties ◽  
C Nmr

X-ray crystal structures and properties of the two Pd(II) and Pt(II) complexes [bpeH2][PdCl4] and [Pt(bpe)Cl2], [bpe = 1,2-bis(pyridin-2-yl)ethane] are described and correlated with the IR and 1H NMR/13C NMR spectroscopic data. In the case of the Pt(II) complex, the 1,2-bis(pyridin-2-yl)ethane is bound to the metal by the heterocycle nitrogen atoms but no direct bond is found in the case of the Pd(II) complex. The ligand exhibits low energy geometries in both compounds: the cis-conformation in the Pt(II) complex, and the transconformation in the Pd(II) complex

Gold(I) Complexes of Chiral Secondary Phosphines

1996 ◽  
Vol 51 (12) ◽  
pp. 1671-1674 ◽  
Author(s):  
Klaus Angermaier ◽  
Alexander Sladek ◽  
Hubert Schmidbaur
Keyword(s):  
Crystal Structures ◽  
Potassium Iodide ◽  
Spectroscopic Data ◽  
Crystal Symmetry ◽  
Chiral Complexes ◽  
The Individual ◽  
High Yields ◽  
Supramolecular Aggregates ◽  
Methyl Phenyl ◽  
Secondary Phosphines

The reaction of (dimethylsulfide)gold(I) chloride and bromide with methyl(phenyl)phosphine in ṯetraẖydrof̱uran affords high yields of the colorless, crystalline, chiral complexes [Me(Ph)HP]AuCl/Br ( 1a, b). Treatment of la with potassium iodide in thf leads to a conversion into the corresponding iodide [Me(Ph)HP] Aul ( 1c). The compounds were characterized by their analytical and spectroscopic data, and the crystal structures of la, b have been determined. The two compounds are isomorphous. In the lattice the monomers form chain-like supramolecular aggregates through auriophilic Au-Au contacts. The chains contain both enantiomers following the sequence ..R S R S R S.., with the individual components related by crystal symmetry.

Diphenyl(2-hydroxy-phenyl)phosphine and its Trimethylsilyl Ether as Ligands for Gold(I) Complexes

1999 ◽  
Vol 54 (1) ◽  
pp. 30-37 ◽  
Author(s):  
Christian Hollatz ◽  
Annette Schier ◽  
Hubert Schmidbaur
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonding ◽  
Hydrogen Bonds ◽  
Crystal Structures ◽  
Intermolecular Interactions ◽  
Spectroscopic Data ◽  
Trimethylsilyl Ether ◽  
Chloro Complex

Diphenyl(2-hydroxy-phenyl)phosphine was introduced as a ligand for gold(I) halides and pentafluorophenyl gold(I) in order to probe the interplay of intra- and intermolecular interactions based on aurophilic (Au· · ·Au) and hydrogen bonding. 1:1 complexes of the type Ph2(2-HO-C6H4)P-Au-X with X = Cl, Br, C6F5 have been prepared and characterized by analytical and spectroscopic data. The crystal structure of the chloro complex (1) has been determined. In the lattice the molecules form dimers through O-H· · ·Cl hydrogen bonds. Au· · ·Au contacts are ruled out by steric congestion. Reaction of 1 with triethylamine yields a 1:1 adduct with O-H· · ·NEt3 hydrogen bonding. The trimethylsilyl ether of the title ligand also forms 1:1 complexes with AuCl, AuBr, Aul, and AuC6F5. The crystal structures of the chloro (5) and iodo (7) compound have been determined. In both cases the lattices are built from monomers which show only minor differences in their conformations. The silylether groups are not acting as intra- or intermolecular donor functions to the gold atoms.

Azide und Cyanamide – ähnlich und doch anders/Azides and Cyanamides – Similar and Yet Different

2003 ◽  
Vol 58 (11) ◽  
pp. 1097-1104 ◽  
Author(s):  
Olaf Reckeweg ◽  
Arndt Simon
Keyword(s):  
Ir Spectroscopy ◽  
Single Crystals ◽  
Crystal Structures ◽  
Spectroscopic Data ◽  
Structural Features ◽  
X Ray Diffraction ◽  
X Ray ◽  
First Time ◽  
Raman And Ir Spectroscopy

Abstract The crystal structures of LiN3*H2O (P63/mcm (No. 193), Z = 6; 924.01(13); 560.06(7) pm); NH4N3 (Pmna (No. 53), Z =4; a=889.78(18), b=380,67(8), c=867.35(17) pm); Ca(N3)2 (Fddd (No. 70), Z = 8; a=595.4(2), b=1103.6(5), c=1133.1(6) pm), Sr(N3)2 (Fddd (No. 70), Z =8; a= 612.02(9), b = 1154.60(18), c = 1182.62(15) pm); Ba(N3)2 (P21/m (No. 11), Z = 2; a = 544.8(1), b = 439.9(1), c = 961.3(2) pm, β = 99.64(3)°) and TlN3 (I4/mcm (No. 140), Z = 2; 618.96(9); 732.71(15) pm) have been either determined for the first time or redetermined by X-ray diffraction on single crystals. The afore mentioned compounds, AN3 (A = Na, K, Rb, Cs), M(N3)2 · 2.5 H2O (M = Mg, Zn) and the cyanamides Li2CN2, CdCN2 and CuCN2 were investigated by Raman and IR spectroscopy (KBr technique). Structural features and spectroscopic data of azides and cyanamides from this work and from literature are listed and compared.

scholarly journals Syntheses, spectroscopy, and crystal structures of 3-(4-bromophenyl)-1,5-diphenylformazan and the 3-(4-bromophenyl)-1,5-diphenylverdazyl radical and the crystal structure of the by-product 5-anilino-3-(4-bromophenyl)-1-phenyl-1H-1,2,4-triazole

2018 ◽  
Vol 74 (3) ◽  
pp. 292-297 ◽  
Author(s):  
Gregor Schnakenburg ◽  
Andreas Meyer
Keyword(s):  
Crystal Structure ◽  
Crystal Structures ◽  
Organic Compounds ◽  
Spectroscopic Data ◽  
Structural Data ◽  
The Other ◽  
Side Product ◽  
Axis Direction ◽  
Verdazyl Radical ◽  
First Time

The title compounds, C19H15BrN4, C20H16BrN4and C20H15BrN4, are nitrogen-rich organic compounds that are related by their synthesis. The verdazyl radical, in which stacking leads to antiferromagnetic interactions, was reported previously [Iwaseet al.(2013).Phys. Rev. B,88, 184431]. For this compound, improved structural data and spectroscopic data are presented. The other two compounds have been crystallized for the first time and form stacks of dimers, roughly along thea-axis direction of the crystal. The formazan molecule shows signs of rapid intramolecular H-atom exchange typical for this class of compounds and spectroscopic data are provided in addition to the crystal structure. The triazole compound appears to be a side-product of the verdazyl synthesis.

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