Electrophilic cleavage of carbon-fluorine bonds in hydrido trifluoromethyl complexes of platinum(II) by proton acids. Synthesis of hydrido carbene and hydrido carbonyl derivatives and x-ray structures of trans-PtH(CF3)(PPh3)2 (180 K) and trans-[PtH[cyclic](COCH2CH2O)(PPh3)2]BF4 (298 K)

1989 ◽  
Vol 28 (5) ◽  
pp. 840-846 ◽  
Author(s):  
Rino A. Michelin ◽  
Renzo Ros ◽  
Giuseppe Guadalupi ◽  
Gabriella Bombieri ◽  
Franco Benetollo ◽  
...  
Keyword(s):  
X Ray ◽  
Carbonyl Derivatives

Synthesis, X-Ray Analysis, and Electrochemical Study of Some Manganese Carbonyl Derivatives with 1,1′-Bis(diphenylphosphino)ferrocene, dppfe

1994 ◽  
Vol 67 (9) ◽  
pp. 2440-2446 ◽  
Author(s):  
Satoru Onaka ◽  
Masa-aki Haga ◽  
Shigeru Takagi ◽  
Mayumi Otsuka ◽  
Katuya Mizuno
Keyword(s):  
Electrochemical Study ◽  
X Ray ◽  
Carbonyl Derivatives ◽  
Manganese Carbonyl

Neuartige basische Liganden für die homogenkatalytische Homologisierung von Methanol zu Ethanol, II [1]. Synthese und komplexchemisches Verhalten potentiell zwei- und dreizähniger P–N- und P–O-haltiger Chelatliganden / Novel Basic Ligands for the Homogeneous Catalytic Homologation of Methanol to Ethanol, II [1]. Synthesis and Complex Chemical Behaviour of Potential Bi- and Tridentate P–N and P–O Containing Chelate Ligands

1984 ◽  
Vol 39 (5) ◽  
pp. 632-642 ◽  
Author(s):  
Ekkehard Lindner ◽  
Hartwig Rauleder ◽  
Christoph Scheytt ◽  
Hermann August Mayer ◽  
Wolfgang Hiller ◽  
...  
Keyword(s):  
Synthesis Gas ◽  
Bidentate Ligand ◽  
Monoclinic Space Group ◽  
Tridentate Ligands ◽  
Complex Chemical ◽  
X Ray ◽  
Carbonyl Derivatives ◽  
Chemical Behaviour ◽  
Derivatives Of ◽  
P Ligands

Tridentate P-N and P-O ligands of the type RP(XC5H4N)2 (1a, b, a′, b′) [X = O, NH: R = CH3 (a, a′), t-Bu (b, b′)] and PhP(CH2C4H7O)2 (1c″) are obtained by reaction of RPCl2 with 2-hydroxy- and 2-aminopyridine and Li2PPh with tetrahydrofurfuryil chloride, respectively. In a similar way the potential bidentate ligand Ph2PCH2C4H7O (2c″) is formed by the action of LiPPh2 on ClCH2C4H7O. Potential tridentate ligands as RP(C4H3O)2 (3a‴-c‴) [R = CH3 (a‴), t-Bu (b‴), Ph (c‴)| with two furyl-phosphorus bonds can be isolated from RPCl2 and furyllithium. The complex chemical behaviour towards Mo(CO)6 or carbonyl derivatives of chromium was elucidated for 2c‴ and 3a‴- c‴, resulting in the formation of (OC)5MoPPh2CH2C4H7O (4c″) and trans-(OC)4Cr[RP(C4H3O)2]2 (5a‴-c‴), respectively. In the case of 5a‴ an X-ray investigation proved 3a‴-c‴ to be only monodentate P-ligands 5a‴ crystallizes in the monoclinic space group P21/c with Z = 2. 1c″ is the most versatile species within this series and functions probably as a tri-, bi- and monodentate P-O ligand. With 1c″ and 3c″ some homologation experiments of methanol at 200 °C and 304 bar synthesis gas pressure were carried out

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.

Zur Stereochemie von Diazadien-Metall-Komplexen, V. Molekülstrukturen und CO-Kraftkonstanten nicht-starrer Chrom-, Molybdänund Wolframcarbonylderivate DAD M(CO)3(*CO) (*C0 = 12CO, 13CO, C180)/ Stereochemistry of Diazadiene Metal Complexes, V Molecular Structures and CO Force Constants of Non-Rigid Chromium, Molybdenum and Tungsten Carbonyl Derivatives DAD M(CO)3(*CO) (*CO = 12CO, 13CO, C18O)

1983 ◽  
Vol 38 (5) ◽  
pp. 568-579 ◽  
Author(s):  
Heindirk tom Dieck ◽  
Thomas Mack ◽  
Karl Peters ◽  
Hans-Georg von Schnering
Keyword(s):  
Force Constant ◽  
Good Accuracy ◽  
Interaction Force ◽  
Force Constants ◽  
Molecular Structures ◽  
X Ray ◽  
Carbonyl Derivatives ◽  
Donor Acceptor ◽  
Site Exchange ◽  
Ray Methods

AbstractDiazadiene metal tetracarbonyls, DAD M(CO)4, (M = Cr, Mo, W; DAD = R-N = CH-CH = NR with aliphatic and aromatic substituents R) show equidistribution of one labelled CO when synthesized from fac-DAD M(CO)3(CH3CN) as a consequence of intramolecular CO site exchange. The structures of two Mo-complexes (1: R = iso-propyl; 2: R = 2,6-diisopropylphenyl) with DAD's of different bulkiness have been solved by X-ray methods. From the infrared solution spectra, including those of isotopically labelled (13CO, C18O) compounds, all of the force constants k1, k2, ktt, kcc and kcc have been calculated independently. The ratios of interaction force constants deviate sharply from Cotton-Kraihanzel assumptions, perhaps because of the substantial deviation of the iraws-pair of CO groups from linearity (1: 154.5°, 2: 147.9°). The solid state N-Mo, Mo-C and C - O bond lengths are neither in agreement with the generally accepted picture for donor/acceptor influences nor with typical IR data and force constant interpretations. (2 with higher v(CO) and k1, k2 has the longer CO bonds and shorter Mo-C bonds than 1.) The force constant sets have been used to calculate CO frequencies for over 60 labelled compounds with good accuracy (Δv < 2 cm-1).

Synthesis and coordinating properties of the anionic tridentate ligand, methyl tris(1-pyrazolyl)gallate, [MeGa(N2C3H3)3]−. X-ray crystal structure of [MeGa(N2C3H3)3]Mo(CO)2(η3-C3H5)

1978 ◽  
Vol 56 (16) ◽  
pp. 2099-2108 ◽  
Author(s):  
Kenneth R. Breakell ◽  
Steven J. Rettig ◽  
Douglas L. Singbeil ◽  
Alan Storr ◽  
James Trotter
Keyword(s):  
Crystal Structure ◽  
Transition Metal ◽  
Transition Metal Ions ◽  
Tridentate Ligand ◽  
Central Metal ◽  
Carbonyl Complexes ◽  
X Ray ◽  
Carbonyl Derivatives ◽  
Length Data

The anionic tridentate ligand, [MeGa(N2C3H3)3]−, has been characterized and its coordinating properties studied. It acts as a six-electron chelating ligand to divalent transition metal ions giving complexes of the type, [MeGa(N2C3H3)3]2M (M = Mn, Fe, Co, Ni, Cu, Zn), believed to possess an octahedral MN6 core. The ligand also forms numerous carbonyl complexes and its coordinating ability in Mo, W, and Mn carbonyl derivatives is compared with that of similar boron ligands and the η5-C5H5 ligand. From ir measurements and bond length data it appears that the [MeGa(N2C3H3)3]− ligand is superior in creating an electron-rich transition metal centre, and it also affords greater steric protection for the central metal. The expected tridentate chelating nature of the new ligand has been demonstrated through a crystal structure determination of the complex [MeGa(N2C3H3)3]Mo(CO)2(η3-C3H5). Crystals of this complex are tetragonal, a = 26.217(3), c = 10.723(2) Å, Z = 16, space group I41/a. The structure was solved by Patterson and Fourier syntheses and was refined by full-matrix least-squares procedures to a final R of 0.030 and Rw of 0.031 for 2582 reflections with I ≥ 3σ(I).

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