114956-93-3Relevant academic research and scientific papers
New soluble monomeric polyselenide anions, [MQ(Se4)2]2- (M = Mo, W; Q = O, S, Se)
Wardle, Robert W. M.,Mahler, Charles H.,Chau, Chung-Nin,Ibers, James A.
, p. 2790 - 2795 (2008/10/08)
Reaction of MO42- (M = Mo, W) with [(CH3)2(CH3(CH2) 7)Si]2Se provides a new synthetic route to the tetraselenometalates MSe42-. Reaction of MSe42- with Se8, SeS2, or Se4(NC5H10)2 affords the MQ(Se4)22- ion with Q = Se, S, or O, respectively. 77Se NMR studies of this system confirm the general assignment trends of terminal Se (>1200 ppm), metal bound Se (1200-600 ppm), and ring Se (17O and previous 77Se NMR studies. The compound [NEt4]2[MoO(Se4)2] crystallizes in the monoclinic space group P21/c with a = 9.287 (2) ?, b = 17.132 (4) ?, c = 18.353 (4) ?, β = 97.38 (1)°, and Z = 4. The MoO(Se4)22- ion shows square-pyramidal coordination of the MoIV center by the apical O atom and the two bidentate Se42- units. [PPh4]2[WS(Se4)2] crystallizes in the monoclinic space group P21/a with a = 18.366 (7) ?, b = 12.873 (6) ?, c = 20.666 (8) ?, β = 100.74 (1)°, and Z = 4. WS(Se4)22- is structurally analogous to MoO(Se4)22-. All of the MSe4 (M = Mo, W) rings exhibit conformations similar to that of cyclopentane.
