Substituted carbonyl derivatives of the Group VI transition metals. I. Complexes with Bis(diphenylarsino)methane

1971 ◽  
Vol 24 (12) ◽  
pp. 2461 ◽  
Author(s):  
R Colton ◽  
CJ Rix
Keyword(s):  
Transition Metals ◽  
X Ray Diffraction ◽  
Monodentate Ligand ◽  
Group Vi ◽  
X Ray ◽  
Carbonyl Derivatives ◽  
Physical Measurements ◽  
Novel Structure ◽  
Derivatives Of ◽  
Mode Of Coordination

The reactions of the potentially bidentate ditertiary arsine ligand bis-(diphenylarsino)methane, dam, with the hexacarbonyls of the Group VI transition metals have been investigated. N.m.r, spectroscopy has been used to determine the mode of coordination of the ligand. In the compounds M(CO)5(dam), M(CO)4(dam)2, and M(CO)3(dam)3 [M = Cr, Mo, W], dam is acting as a monodentate ligand, but in M(CO)4(dam) it is acting as a normal chelate coordinating to the metal through both arsenic atoms. In the cases of molybdenum and chromium, only, a further type of complex M(CO)2(dam) has been isolated. The results of N.M.R., infrared, and mass spectrometry, together with other physical measurements, can only be explained on the assumption that the ligand was coordinated to the metal by an arene π-linkage and by one arsenic atom. This novel structure has been confirmed by a single crystal X-ray diffraction study on the chromium compound.

Group VI Metal Carbonyl Derivatives of cis-(CH3)2AsC(CF3)=C(CF3)As(CH3)2

1975 ◽  
Vol 53 (22) ◽  
pp. 3401-3407 ◽  
Author(s):  
William R. Cullen ◽  
Lynn Mihichuk
Keyword(s):  
Trans Isomer ◽  
Ultraviolet Irradiation ◽  
Metal Carbonyl ◽  
Monodentate Ligand ◽  
Group Vi ◽  
Carbonyl Derivatives ◽  
Derivatives Of

The carbonyls M(CO)6 (M=Cr, Mo, W) react with cis-(CH3)2AsC(CF3)=C(CF3)As(CH3)2 (L—L) to give the chelate derivatives (L—L)M(CO)4. These react with excess (L—L) on ultraviolet irradiation affording cis-(L—L)2M(CO)2 and trans-(L—L)2M(CO)2 and two isomers of fac-(L—L)2M(CO)3 where one (L—L) is acting as a monodentate ligand, and is either the cis ligand or its trans isomer.

Substituted carbonyl derivatives of the Group VI transition metals. IV. Reactions of some arene-metal tricarbonyls with Triaryl-phosphine and -arsine ligands

1973 ◽  
Vol 26 (3) ◽  
pp. 655 ◽  
Author(s):  
JA Bowden ◽  
R Colton ◽  
CJ Commons
Keyword(s):  
Carbon Monoxide ◽  
Solid State ◽  
Transition Metals ◽  
Steric Effects ◽  
Group Vi ◽  
Decomposition Products ◽  
Carbonyl Derivatives ◽  
Derivatives Of

The reactions of triphenylphosphine and triphenylarsine with (π- arene)M(CO)3 (M = Cr, Mo, W) to yield fac-M(CO)3(RPh3)3 (R = P, As) have been reexamined. Anomalies in the earlier literature have been resolved by the isolation of two solid state forms of each complex and by a study of the decomposition products of these compounds. Tricarbonyl complexes of tritolyl-phosphines and -arsines are also reported and their behaviour suggests steric effects initiate decomposition. In addition, a number of (π-arene)M(CO)3 compounds were shown to react with carbon monoxide to form M(CO)6.

Substituted carbonyl derivatives of the Group VI transition metals. V. Complexes with tolyl-substituted Bis(diphenylarsino)methane ligands

1974 ◽  
Vol 27 (2) ◽  
pp. 401 ◽  
Author(s):  
JA Bowden ◽  
R Colton ◽  
Z Sztajer
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Infrared Spectroscopy ◽  
Magnetic Resonance ◽  
Transition Metals ◽  
Steric Effects ◽  
Group Vi ◽  
Carbonyl Derivatives ◽  
Derivatives Of ◽  
Nuclear Magnetic

Ligands of the type bis(ditoly1arsino)methane have been synthesized and their derivatives with hexacarbonylmolybdenum(0) prepared. Nuclear magnetic resonance and infrared spectroscopy have been used to determine the stereochemistry of the complexes and also to study steric effects within the molecules.

Carbonyl halides of the Group VI transition metals. XI. Dithiocyanatocarbonyl derivatives of molybdenum and tungsten(II)

1968 ◽  
Vol 21 (6) ◽  
pp. 1435 ◽  
Author(s):  
R Colton ◽  
GR Scollary
Keyword(s):  
Transition Metal ◽  
Transition Metals ◽  
Ammonium Chloride ◽  
Pure State ◽  
Ammonium Thiocyanate ◽  
Donor Ligands ◽  
Group Vi ◽  
Derivatives Of ◽  
And Tungsten

Reaction of ammonium thiocyanate with dihalocarbonyls of molybdenum and tungsten(11) leads to the elimination of ammonium chloride and the formation of a dithiocyanatocarbonyl complex of the transition metal. Although the thiocyanatocarbonyls themselves have not been isolated in a pure state, a number of substituted derivatives with phosphorus donor ligands have been prepared and characterized. In general these complexes are less stable than the corresponding carbonyl halide derivatives.

Die Kristallstrukturen der isotypen Verbindungen Ba3[MoN4] und Ba3[WN4] / The Crystal Structures of the Isotypic Compounds Ba3[MoN4] and Ba3[WN4]

1991 ◽  
Vol 46 (5) ◽  
pp. 566-572 ◽  
Author(s):  
Axel Gudat ◽  
Peter Höhn ◽  
Rüdiger Kniep ◽  
Albrecht Rabenau
Keyword(s):  
Transition Metals ◽  
Single Crystal ◽  
Crystal Structures ◽  
Structure Type ◽  
X Ray Diffraction ◽  
X Ray ◽  
Ternary Compounds ◽  
The Third

The isotypic ternary compounds Ba3[MoN4] and Ba3[WN4] were prepared by reaction of the transition metals with barium (Ba3N2, resp.) under nitrogen. The crystal structures were determined by single crystal X-ray diffraction: Ba3[MoN4] (Ba3[WN4]): Pbca; Z = 8; a = 1083.9(3) pm (1091.8(3) pm), b = 1030.3(3) pm (1037.5(3) pm), c = 1202.9(3) pm (1209.2(4) pm). The structures contain isolated tetrahedral anions [MN4]6- (M = Mo, W) which are arranged in form of slightly distorted hexagonal layers and which are stacked along [010] with the sequence (···AB···). Two of the three Ba atoms are situated between, the third one is placed within the layers of [MN4]-groups. In this way the structures can be derived from the Na3As structure type.

Study on a Novel Structure of Zn Phenanthroline Malic Acid Hydrate, [Zn (C12H8N2)(C4H4O5)(H2O)](H2O)

2013 ◽  
Vol 739 ◽  
pp. 26-29
Author(s):  
Hai Xing Liu ◽  
Jing Zhong Xiao ◽  
Huan Mei Guo ◽  
Qing Hua Zhang ◽  
Zhang Xue Yu ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Malic Acid ◽  
Hydrothermal Reaction ◽  
Crystal Packing ◽  
X Ray Diffraction ◽  
Acid Anion ◽  
X Ray ◽  
Hydrogen Bonding Interactions ◽  
Novel Structure ◽  
Acid Hydrate

A novel Zn complex [Zn (C12H8N2)(C4H4O5)(H2O)](H2O) has been synthesized from a hydrothermal reaction and the crystal structure has been determined by means of single-crystal X-ray diffraction. The Zn atom is six-coordinated by two phenanthroline N atoms, three O atoms from malic acid anion and one O atom from water. The crystal packing is stabilized by O-H...O hydrogen bonding interactions.

Synthesis of Galactomannan Sulfate-Citrate

2022 ◽  
Vol 1049 ◽  
pp. 218-223
Author(s):  
Aleksandr S. Kazachenko ◽  
Yuriy N. Malyar ◽  
Anna S. Kazachenko
Keyword(s):  
Biological Activity ◽  
Ftir Spectroscopy ◽  
X Ray Diffraction ◽  
Absorption Bands ◽  
X Ray ◽  
Mixed Ester ◽  
First Time ◽  
Derivatives Of

Sulfated derivatives of polysaccharides have anticoagulant, hypolipedimic and other biological activity. In this work, a complex mixed ester of galactomannan, its sulfate-citrate, was obtained for the first time. The introduction of citrate and sulfate groups was proved by FTIR spectroscopy by the appearance of corresponding absorption bands. It was shown by X-ray diffraction that the introduction of the citrate group leads to the amorphization of the galactomannan structure.

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