Di-tert-butyl phosphate complexes of titanium

被引:49
作者
Lugmair, CG
Tilley, TD [1 ]
机构
[1] Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA
[2] Univ Calif Berkeley, Lawrence Berkeley Lab, Div Chem Sci, Berkeley, CA 94720 USA
关键词
D O I
10.1021/ic971347e
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
Reactions of 1 equiv of HO(O)P((OBu)-Bu-t)(2) with Ti(OR)(4) (R = Et, Pr-i) give the new molecular titanium phosphates [Ti(OR)(3)O2P((OBu)-Bu-t)(2)](n) (1, R = Et; 2, R = Pr-i). In the solid state, 2 exists as a centrosymmetric dimer containing five-coordinate metal centers. Addition of 2 equiv of KOEt to an ethanol solution of 1 led to the formation of [Ti2K(OEt)(8)O2P((OBu)-Bu-t)(2)](2) (3) and 1 equiv of KO2P((OBu)-Bu-t)(2). A single-crystal X-ray structure analysis of 3 revealed that this complex exists in the solid state as a centrosymmetric dimer containing two Ti-centered, face-sharing pseudooctahedra in the unique half of the dimer. Addition of 2 equiv of (KOPr)-Pr-i to a 2-propanol solution of 2 led to the formation of KO2P((OBu)-Bu-t)(2) (4) and Ti((OPr)-Pr-i)(4) in high yield. Cooling a 2-propanol solution of 4 to -80 degrees C led to crystallization of the solvated tetramer [4 . (HOPr3)-Pr-i](4) (mp = -30 degrees C). A single-crystal X-ray structure analysis revealed that this tetramer possesses a cubelike K4O4 core with 4-fold improper rotation symmetry. Multinuclear NMR studies of 1-3 show that the structures of these complexes are dynamic in solution. Crystals of 4 are tetragonal (P4(2)/(n)) with a = 15.6261(3) Angstrom, c = 14.7114(3) Angstrom, and Z = 8.
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页码:1821 / 1826
页数:6
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