3,5-Dimethylpyrazolylphosphine molybdenum(0) and tungsten(0) carbonyl complexes

1980 ◽  
Vol 58 (2) ◽  
pp. 151-158 ◽  
Author(s):  
Harry B. Davis ◽  
James K. Hoyano ◽  
Ping Yuen Leung ◽  
Louis K. Peterson ◽  
Brian Wolstenholme
Keyword(s):  
General Formula ◽  
Metal Atom ◽  
Phosphorus Atom ◽  
Phenyl Ring ◽  
Octahedral Geometry ◽  
Phosphine Ligand ◽  
Carbonyl Complexes ◽  
Coordination Sites ◽  
And Tungsten

Complexes with the general formula [LnM(CO)m], where [Formula: see text] x = 0–2, n = 1 or 2, M = Mo(0) or W(0), m = 3 or 4, were prepared by thermal or photolytic methods by the reaction of the appropriate 3,5-dimethylpyrazolyl phosphine ligand with M(CO)6, norbornadienemetaltetracarbonyl [C7H8M(CO)4], cycloheptatrienylmetaltricarbonyl [C7H8M(CO)3], [(Me2N(CH2)3NMe2)M(CO)4], [(CH3CN)2M(CO)4], or [(CH3CN)3M(CO)3]. Structural evidence indicates octahedral geometry about the metal atom centre, and several modes of coordination for the ligands in those complexes isolated and characterized. For x = 2, the ligand [Formula: see text] was monodentate, via phosphorus in [Formula: see text] and bidentate in [Formula: see text] where coordination by P and the 2N site of the pyrazolyl ring yielded four-membered [Formula: see text] metallocycles. For x = 1, the [Formula: see text] ligand was bidentate, via the phosphorus atom and one of the 2N sites of one of the pyrazolyl substituents, thus giving the four-membered [Formula: see text] metallocycle in [Formula: see text] and tridentate in [Formula: see text] where three facial CO's, two 2N atoms of the pyrazolyl rings, and a part of the phenyl ring occupy the six coordination sites. For x = 0, the P(Me2pz)3 ligand was tridentate via the 2N atoms of all three pyrazolyl rings, thus giving tricyclic systems [P(Me2pz)3M(CO)3] (VIII, IX).

Übergangsmetall-Carbin-Komplexe, LXXIY. Synthese thermisch stabiler neutraler Carbin-Carbonyl-Komplexe von Chrom, Molybdän und Wolfram mit den zweizähnigen Liganden 2.2′ -Bipyridyl und 1.10-Phenanthrolin/ Transition Metal Carbyne Complexes, LXXIV. Synthesis of Thermostable Neutral Carbyne Carbonyl Complexes of Chromium, Molybdenum, and Tungsten with the Bidentate Ligands 2,2′-Bipyridyl and 1,10-Phenanthroline

1983 ◽  
Vol 38 (5) ◽  
pp. 587-591 ◽  
Author(s):  
Alexander Filippou ◽  
Ernst Otto Fischer
Keyword(s):  
Transition Metal ◽  
General Formula ◽  
Carbonyl Groups ◽  
Carbonyl Complexes ◽  
Bidentate Ligands ◽  
Carbyne Complexes ◽  
And Tungsten

AbstractReaction of trans-bromotetracarbonyl(phenylcarbyne)-complexes of chromium, molybdenum and tungsten and trans-bromotetracarbonyl(methylcarbyne) complexes of chromium and tungsten with the bidentate ligands 2,2′-bipyridyl and 1,10-phenanthroline results in the replacement of two carbonyl groups leading to very thermostable carbyne complexes with the general formula Br(CO)2LMCR (L: 2,2′-bipy, ophen; M: Cr, Mo, W; R : CH3, C6H5).

Synthesis and reactions of xanthate and thioxanthate carbonyl complexes of molybdenum and tungsten

1978 ◽  
Vol 159 (2) ◽  
pp. 171-178 ◽  
Author(s):  
Walter K. Dean ◽  
Barbara L. Heyl
Keyword(s):  
Carbonyl Complexes ◽  
And Tungsten

Spinel Formation from Magnesium Aluminium Double Alkoxides

1986 ◽  
Vol 73 ◽  
Author(s):  
Kenneth Jones ◽  
Thomas J. Davies ◽  
Harold G. Emblem ◽  
Peter Parkes
Keyword(s):  
Nmr Spectroscopy ◽  
General Formula ◽  
Metal Atom ◽  
Vacuum Distillation ◽  
Viscosity Measurements ◽  
Spinel Formation ◽  
Bonding Phase ◽  
Xrd Studies ◽  
Aluminium Alkoxide

ABSTRACTDouble alkoxides of the general formula Mg[Al(OR)4]2 where R is iso-Pr or sec-Bu were prepared by reacting aluminium and magnesium metals together with the alcohol ROH and purified by vacuum distillation. They were characterised by IR, proton and 27Al NMR spectroscopy and MW determination. A magnesium aluminium double alkoxide was also prepared by treating the commercially available aluminium alkoxide ‘Aliso B’ [a mixed aluminium (iso-propoxide)(sec-butoxide)] with magnesium and iso-propanol. Treatment of magnesium aluminium double alkoxides with water and an alkanolamine (preferably triethanolamine) gives a rigid coherent gel. Viscosity measurements and 27Al NMR spectroscopy suggest that the double alkoxide does not break down to its constituents during hydrolysis. The air-dried gel was shown by XRD to convert quantitatively to spinel on firing to 1500°C. The resistance of the double alkoxide moiety to hydrolysis explains the ease of conversion to spinel on firing. The gel has been used to bind alumina and magnesia grain. Gels suitable for binding refractory grain were obtained only when the alkanolamine content corresponded to one alkanolamine group per metal atom. Electron micrographic and XRD studies showed that in fired refractory pieces, the bonding phase was spinel.

ChemInform Abstract: CARBONYL COMPLEXES OF CHROMIUM, MOLYBDENUM, AND TUNGSTEN CONTAINING SULFANE LIGANDS

1978 ◽  
Vol 9 (2) ◽  
Author(s):  
M. HERBERHOLD ◽  
G. SUESS
Keyword(s):  
Carbonyl Complexes ◽  
And Tungsten

Organometallic Lewis Acids, Part LVIIII [1]. Directed Synthesis of Dinuclear Metal Carbonyl Complexes of Rhenium, Iron, Chromium, and Tungsten with a Single Unsupported Halide or Pseudohalide Bridge (Cl-, Br-, I-, CN-, C(CN)3-, NCS-, PPh2-, SH-) by Use of Re(CO)5FBF3

2014 ◽  
Vol 69 (11-12) ◽  
pp. 1215-1220
Author(s):  
Peter M. Fritz ◽  
Wolfgang Sacher ◽  
Wolfgang Beck
Keyword(s):  
Lewis Acids ◽  
Metal Carbonyl ◽  
Carbonyl Complexes ◽  
Metal Carbonyl Complexes ◽  
Directed Synthesis ◽  
Iron Chromium ◽  
And Tungsten

Abstract By use of Re(CO)5FBF3 the complexes with a single unsupported halide or pseudohalide bridge [Cp(OC)2Fe-X-Re(CO)5]+ BF4- (X=Cl, I, PPh2), (OC)5M-X-Re(CO)5 (M=Cr, W; X=Br, I, CN, NCS, SH), (OC)5W-N≡C-C[-C≡N-Re(CO)5]2+ BF4-, Cp(OC)(NC)Fe-C≡N-Re(CO)5, and [(OC)5Re-N3-Re(CO)5]+ BF4- have been synthesized.

scholarly journals Crystal structure of (2-formylphenolato-κ2O,O′)oxido(2-{[(2-oxidoethyl)imino]methyl}phenolato-κ3O,N,O′)vanadium(V)

2015 ◽  
Vol 71 (5) ◽  
pp. m104-m105
Author(s):  
Sowmianarayanan Parimala ◽  
Parasuraman Selvam
Keyword(s):  
Crystal Structure ◽  
Metal Atom ◽  
Basal Plane ◽  
Octahedral Geometry ◽  
Distorted Octahedral Geometry ◽  
Interplanar Angle ◽  
Vanadyl Complex ◽  
Distorted Octahedral ◽  
Benzene Rings ◽  
Axial Bond

In the unsymmetrical title vanadyl complex, [V(C9H9NO2)(C7H5O2)O], one of the ligands (2-formylphenol) is disordered over two sets of sites, with an occupancy ratio of 0.55 (2):0.45 (2). The metal atom is hexacoordinated, with a distorted octahedral geometry. The vanadyl O atom (which subtends the shortest V—O bond) occupies one of the apical positions and the remaining axial bond (the longest in the polyhedron) is provided by the (disordered) formyl O atoms. The basal plane is defined by the two phenoxide O atoms, the iminoalcoholic O and the imino N atom. The planes of the two benzene rings are almost perpendicular to each other, subtending an interplanar angle of 84.1 (2)° between the major parts. The crystal structure features weak C—H...O and C—H...π interactions, forming a lateral arrangement of adjacent molecules.

scholarly journals Field-Induced Single-Ion Magnet Phenomenon in Hexabromo- and Hexaiodorhenate(IV) Complexes

2020 ◽  
Vol 6 (2) ◽  
pp. 20
Author(s):  
Carlos Rojas-Dotti ◽  
Adrián Sanchis-Perucho ◽  
Marta Orts-Arroyo ◽  
Nicolás Moliner ◽  
Ricardo González ◽  
...  
Keyword(s):  
Magnetic Susceptibility ◽  
General Formula ◽  
Crystal Packing ◽  
Variable Temperature ◽  
Magnetic Behaviour ◽  
Octahedral Geometry ◽  
Organic Cations ◽  
Ac Magnetic Susceptibility ◽  
Halide Ions ◽  
Triclinic System

Two mononuclear ReIV complexes of general formula (PPh4)2[ReX6] [PPh4+ = tetraphenylphosphonium cation, X = Br (1) and I (2)] have been prepared and structurally and magnetically characterised. Both compounds crystallise in the triclinic system with space group Pī. Their structures are made up of hexahalorhenate(IV), [ReX6]2−, anions, and bulky PPh4+ cations. Each ReIV ion in 1 and 2 is six-coordinate and bonded to six halide ions in a quasi regular octahedral geometry. In their crystal packing, the [ReX6]2− anions are well separated from each other through the organic cations, generating alternated anionic and cationic layers, and no intermolecular Re−X···X−Re interactions are present. Variable-temperature dc magnetic susceptibility measurements performed on microcrystalline samples of 1 and 2 show a very similar magnetic behaviour, which is typical of noninteracting mononuclear ReIV complexes with S = 3/2. Ac magnetic susceptibility measurements reveal the slow relaxation of the magnetisation in the presence of external dc fields for 1 and 2, hence indicating the occurrence of the field-induced single-ion magnet (SIM) phenomenon in these hexabromo- and hexaiodorhenate(IV) complexes.

ChemInform Abstract: PHOTOGENERATION OF COORDINATIVELY UNSATURATED SANDWICH COMPOUNDS OF MOLYBDENUM AND TUNGSTEN FROM THEIR CARBONYL COMPLEXES

1974 ◽  
Vol 5 (32) ◽  
pp. no-no
Author(s):  
KIT L. TANG WONG ◽  
JOSEPH L. THOMAS ◽  
HANS H. BRINTZINGER
Keyword(s):  
Carbonyl Complexes ◽  
Sandwich Compounds ◽  
And Tungsten
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