Steinberger H U, Ziemer B, Meisel M
Institut für Chemie, Humboldt-Universität zu Berlin, Hessische Strasse 1-2, 10115 Berlin, Germany.
Acta Crystallogr C. 2001 Mar;57(Pt 3):323-4. doi: 10.1107/s010827010002000x.
In tris(tert-butyl)phosphine selenide, C(12)H(27)PSe, all the methyl ligands are disordered over two sites in the ratio 70/30. The molecule displays crystallographic C(3) symmetry. The bond angles at the P atom are distorted tetrahedral [C--P--C 110.02 (5) degrees and Se==P--C 108.91 (5) degrees ]. The P--C and P==Se bond lengths are 1.908 (1) and 2.1326 (6) A, respectively. A comparison of the structural data of the complete series of tris(tert-butyl)phosphine chalcogenides ((t)Bu(3)PO, (t)Bu(3)PS, (t)Bu(3)PSe and (t)Bu(3)PTe) with the corresponding data of other phosphine chalcogenides substituted by smaller organic groups shows the great influence of the bulky tert-butyl ligands.
在三（叔丁基）膦硒化物C(12)H(27)PSe中，所有甲基配体在两个位置上无序分布，比例为70/30。该分子呈现晶体学C(3)对称性。磷原子处的键角呈扭曲的四面体结构[C--P--C为110.02 (5)°，Se==P--C为108.91 (5)°]。P--C键长和P==Se键长分别为1.908 (1) Å和2.1326 (6) Å。将三（叔丁基）膦硫属化物（(t)Bu(3)PO、(t)Bu(3)PS、(t)Bu(3)PSe和(t)Bu(3)PTe）完整系列的结构数据与其他被较小有机基团取代的膦硫属化物的相应数据进行比较，结果表明庞大的叔丁基配体具有很大影响。
