Investigation of phosphorus–carbon bond lengths in aromatic phosphines. Part I. Crystal and molecular structures of tri-o-tolylphosphine, -phosphine oxide, -phosphine sulphide, and -phosphine selenide

Investigation of phosphorus–carbon bond lengths in aromatic phosphines. Part I. Crystal and molecular structures of tri-o-tolylphosphine, -phosphine oxide, -phosphine sulphide, and -phosphine selenide
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芳香膦中磷碳键长度的研究第一部分:三邻甲苯基膦、氧化膦、硫化膦和硒化膦的晶体和分子结构。

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发表时间:
1975
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通讯作者:
B. Dahlén
B. Dahlén
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文献类型:
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作者:
T. Cameron;B. Dahlén

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确定了四个环中四个标题化合物的晶体和分子结构。三邻甲苯基膦(I),三斜晶系,a=12.081(5),b=10.915(5),c=14.348(7)A; α= 91.95(5)°,β= 110.58(4)°,γ= 98.22(5)°,空间群P,Z= 4; R 0.045,4 698 次独立反射。三邻甲苯基氧化膦(II),单斜晶系,a=9.039(5),b=17.282(6),c=35.192(12)A,β=95.12(1)°空间群P21/c,Z=12; R 0.075,5 428 次独立反射。三邻甲苯基硫化膦(III),三斜晶系,a=15.377(4),b=15.346(4),c=7.979(4)A; α=103.1(1)°,β=86.6(1)°,γ=96.5(1)°,空间群P,Z=4; R 0.094,2 890 次独立反射。三邻甲苯基硒化膦(IV),单斜晶系,a= 33.497(10),b= 8.004(2),c= 14.701(10)A,β= 110.67(4)°,空间群C2/c,Z= 8; R 0.067, 2 343 个独立反射。P-C 键长的差异似乎是由芳香基团和磷原子上的电荷密度、空间位阻和晶体堆积力决定的,而不是由芳香基团的 π 系统向磷原子的任何延伸决定的。
The crystal and molecular structure of the four title compounds from four circle have been determined. Tri-o-tolylphosphine (I), triclinic, a= 12.081(5), b= 10.915(5), c= 14.348(7)A; α= 91.95(5)°, β= 110.58(4)°, γ= 98.22(5)°, space group P, Z= 4; R 0.045, 4 698 independent reflections. Tri-o-tolylphosphine oxide (II), monoclinic, a= 9.039(5), b= 17.282(6), c= 35.192(12)A, β= 95.12(1)° space group P21/c, Z= 12; R 0.075, 5 428 independent reflections. Tri-o-tolylphosphine sulphide (III), triclinic, a= 15.377(4), b= 15.346(4), c= 7.979(4)A; α= 103.1(1)°, β= 86.6(1)°, γ= 96.5(1)°, space group P, Z= 4; R 0.094, 2 890 independent reflections. Tri-o-tolylphosphine selenide (IV), monoclinic, a= 33.497(10), b= 8.004(2), c= 14.701(10)A, β= 110.67(4)°, space group C2/c, Z= 8; R 0.067, 2 343 independent reflections.The differences in P–C bond lengths appear to be determined by charge density on the aromatic group and the phosphorus atom, and by steric hindrance and crystal packing forces, and not by any extension of the π system of the aromatic groups to the phosphorus atom.