- 作者: Gwo-Wei Tsenga, Maw-Cherng Suena, Jhy-Der Chena, Jiunn-Jer Hwanga, Yui Whei Chen-Yanga, Tai-Chiun kengb and Ju-Chun Wangb
- 中文摘要: The red complex trans-Mo2(O2CCH3)2(m-dppa)2(BF4)2, 1, was prepared by reaction of [Mo2(O2CCH3)2(CH3CN)6][BF4]2 with dppa (dppa = Ph2PN(H)PPh2) in THF. The reactions of Mo2(O2C(CH2)nCH3)4 with dppa and (CH3)3SiX (X = Cl or Br) afforded the complexes trans-Mo2X2(O2C(CH2)nCH3)2(m-dppa)2 (X = Cl, n = 2, 2; X = Br, n = 2, 3; X = Cl, n = 10, 4; X = Cl, n = 12, 5). Their UV-vis, IR and 31P{1H}-NMR spectra have been recorded and the structures of 1, 2 and 3 have been determined. Crystal data for 1: space group P21/n, a = 12.243(1) ? B = 17.222(1) ? C = 13.266(1) ? B = 95.529(1)? V = 2784.1(6) ?/font>3, Z = 2, with final residuals R = 0.0509 and Rw = 0.0582. Crystal data for 2?/font>4CH2Cl2: space group P21/n, a = 13.438(1) ? B = 19.276(1) ? C = 14.182(1) ? B = 111.464(1)? V = 3418.9(6) ?/font>3, Z = 2, with final residuals R = 0.0492 and Rw = 0.0695. Crystal data for 3?/font>4CH2Cl2: space group P21/n, a = 13.579(1) ? B = 19.425(1) ? C = 14.199(1) ? B = 111.881(2)? V = 3475.6(7) ?/font>3, Z = 2, with final residuals R = 0.0703 and Rw = 0.0851. Comparison of the structural data shows that the effect of the axial ligand on weakening the Mo-Mo bond strength is X– > CH3CN > BF4–. The Tm values are 121.7 蚓 for 2, 111.1 蚓 for 3 and 91.5 蚓 for 5, respectively.
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