36643-83-1Relevant articles and documents
?-Alkenyl and halogeno complexes of vanadium (I and II). The crystal structures of (ClV(CO)2(Ph2PCH2CH2PEt2)2*benzene, Br2V(Me2PCH2CH2PMe2)2 and I2V(Me2PCH2CH2PMe2)2*toluene
Suessmilch, Frank,Olbrich, Falk,Gailus, Hartmut,Rodewald, Dieter,Rehder, Dieter
, p. 119 - 126 (2007/10/02)
Various ?-alkenyl complexes of the general composition (alkenyl)V(CO)6-npm (where n = 2,3 and pm is a potentially m-dentate phosphine coordinated through n of its donor centers, n m) have been prepared by photo-induced hydrovanadation of the alkynes 2-butyne, 1-hexyne, 3-hexyne and 3,3-dimethyl-1-butyne.In each case the Z isomer is formed exclusively or as the predominant product.Reaction of hexacarbonylvanadate with pyridinium bromide and pm leads to the bromo complexes BrV(CO)6-npm (n = 2-4).In the case of pm = Me2PCH2CH2PMe2 (dmpe), the complex Br2V(dmpe) is also formed.The complex I2V(dmpe)2*toluene was obtained as a by-product from the reaction between and perfluoro-isopropyl iodide.The face-capped, trigonal-prismatic complex ClV(CO)2(pepe)2*benzene (pepe = Ph2PCH2CH2PEt2) was obtained from the photo-reaction between HV(CO)4pepe and Cl.Single crystal X-ray diffraction studies were carried out on all three complexes.The 51V NMR chemical shifts for the seven-coordinate complexes XV(CO)npm have been used to arrange the ligands X in a magnetochemical series of ligand strengths (alkenyl alkyl Br I N3 CN). Key words: Vanadium; Alkenyl; Phosphine; Crystal structure; Halide
Synthesis of hexacarbonyl derivatives of group 5 metals and electron-transfer processes. Crystal and molecular structure of tetracarbonyl(1,2-bis(diphenylphosphino)ethane)iodotantalum
Calderazzo, Fausto,Pampaloni, Guido,Pelizzi, Giancarlo,Vitali, Francesca
, p. 1083 - 1092 (2008/10/08)
Vanadium, niobium, and tantalum hexacarbonylmetalate(-I) derivatives of several heterocyclic nitrogen bases, RnB[M(CO)6]n (R = H, Me; n = 1, 2), have been synthesized. In some cases an electron transfer from the hexacarbonylmetalate to the protonated or methylated BRnn+ cation has been observed. Pyridinium halides react with Na[M(CO)6] (M = Nb, Ta) in the presence of 1 equiv of 1,2-bis(diphenylphosphino)ethane (diphos) to give high yields of the halo tetracarbonyl derivatives MX(CO)4(diphos). The red-orange TaI(CO)4(diphos) complex has been studied by X-ray diffraction methods. Crystal data: space group P21/n; Mr 818.3; a = 14.864 (10) ?, b = 9.875 (7) ?, c = 19.335 (13) ?; β = 105.61 (2)°; U = 2733 (3) ?3; Z = 4; Dcalcd = 1.988 g cm-3; F(000) = 1568; μ(Mo Kα) = 52.4 cm-1. The geometry of the seven-coordinate tantalum atom is best described as a capped trigonal prism with the iodide ligand in the capping position. By reaction of Na[Ta(CO)6] with 1 equiv of hydrogen chloride and diphos in toluene, the hydride TaH(CO)4(diphos) has been isolated in good yield.
