70602-45-8Relevant academic research and scientific papers
Formation of 1,2-bis (diphenylphosphino)ethane, dppe, from two coordinated diphenylvinylphosphine (DPVP) ligands; Crystal structures of cis- and trans- (DPVP)2 Mo (CO)4 and (dppe)M(CO)4 (M=Cr, Mo)
Maitra, Kalyani,Nelson, John H.
, p. 203 - 210 (2008/10/08)
Photolysis of a 1:2 mixture of M(CO)6 (M=Cr, Mo) and diphenylvinylphosphine (DPVP) in tetrahydrofuran produces (DPVP)M(CO)5, cis- and trans- (DPVP)2M(CO)4, (dppe)M(CO)4 (dppe=1,2-bis (diphenylphosphino)ethane, and fac- (dppe) (DPVP)Mo (CO)3. The complexes have been characterized by elemental analysis, infrared and 1H, 13C{ 1H} and 31P{ 1H} NMR spectroscopy and in four cases by X-ray crystallography. The Mo-P bond lengths for cis- (DPVP)2Mo (CO)4 (2.5509 (10) A, ave.) are longer than those for the trans-isomer (2.4713 (7) A) due to the greater trans influence of CO than of DPVP. The Mo-P bond lengths for (dppe)Mo (CO)4 (2.5020 (11) A, ave.) lie between these two values.
Bimetallic Systems. Part 9. The Synthesis of and Nuclear Magnetic Resonance Studies on 10-Membered Ring Complexes of Type 1(μ-Ph2PCH2CH2PPh2)2M2(CO)4> (M1, M2 = Cr, Mo, or W)
Iggo, Jonathan A.,Shaw, Bernard L.
, p. 1009 - 1014 (2007/10/02)
The Ph2PCH2CH2PPh2(dppe) bridged, bimetallic 10-membered ring complexes 1(μ-dppe)2M2(CO)4> have been synthesised by treating a complex of type cis-1(CO)4(PPh2H)2> with one of type cis-2(CO)4(PPh2(CH=CH2))2> in the presence of potassium t-butoxide as catalyst.The new precursor complexes cis- were prepared by displacement of norbornadiene (nbd) from .The fluxional processes in the 10-membered M1(μ-dppe)2M2 rings have been studied by variable-temperature 31P-(1H) n.m.r. spectroscopy and are characterised by a change from a second-order AA'XX' system at 20 deg C to an essentially first-order AMPX system at -90 deg C.The spectra have been fully interpreted and values for 2J(cis-PMP) obtained.The 31P-(1H) n.m.r. spectra of the homonuclear M(μ-dppe)2M systems change from A4 at 20 deg C to AA'BB' at -90 deg C.The low-temperature (-100 deg C) 1H and 1H-(31P) spectra were not resolved.These binuclear complexes are remarkably inert towards disproportionation to mononuclear chelate species and to attack by HCl or halogens.
