89655-93-6Relevant academic research and scientific papers
Formation of isomeric dimolybdenum(II) compounds using the potentially ambidentate ligands [R2PC(S)NR′]- (R/R′ = Ph/Ph, Ph/Me) and [Me2NC(S)NPh]-
Ambrosius,Cotton,Falvello,Hintzen,Melton,Schwotzer,Tomas,Van Der Linden
, p. 1611 - 1616 (2008/10/08)
Ligands of the type [R2PC(S)NR′]- or [R2NC(S)NR′]- displace acetate ions from Mo(O2CCH3)4 to afford products of general formula Mo2[R2XC(S)NR′]4. Four such products are reported here: 1, R2X = Ph2P and R′ = Ph; 2a, R2X = Ph2P, R′ = Me, green; 2b, R2X = Ph2P, R′ = Me, yellow; 3, R2X = Me2N, R′ = Ph. A variety of physical data, including single-crystal X-ray structural studies of 2a and 2b, provide information on the structures and properties of these compounds. Compounds 1 and 2b have all four ligands coordinated in the same manner, through the N and S atoms, and in the case of 2b the crystal structure shows that the arrangement is such that like atoms on a given molybdenum atom are trans to each other. The Mo-Mo distance in 2b is 2.083 (1) ?. In compound 3 the spectroscopic data suggest that coordination is through N and S for all four ligands. Compound 2a is an isomer of 2b in which two ligands (trans to each other) are N,S coordinated while the other two are N,P coordinated. On each Mo atom the N atoms are cis to each other, and the Mo-Mo distance in 2a is 2.104 (2) ?. Crystallographic data are as follows: For 2a the space group is P21/c with unit cell dimensions of a = 13.163 (4) ?, b = 14.502 (4) ?, c = 16.719 (6) ?, β = 105.38 (3)°, V = 3077 (3) ?3, and Z = 2. For 2b the space group is P1 with unit cell dimensions of a = 15.513 (3) ?, b = 16.150 (3) ?, c = 14.909 (3) ?, α = 94.68 (2)°, β = 118.53 (2)°, γ = 63.93 (1)°, V = 2908 (2) ?3, and Z = 2.
