首页> 外文期刊>Acta Crystallographica, Section B. Structural Science >Studies in Aryltin Chemistry. IX. Structures of Tetra(m-methoxyphenyl)tin(IV) and Tetra(o-methoxyphenyl(tin(IV)
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Studies in Aryltin Chemistry. IX. Structures of Tetra(m-methoxyphenyl)tin(IV) and Tetra(o-methoxyphenyl(tin(IV)

机译:芳基化学研究。九。四(间甲氧基苯基)锡(IV)和四(邻甲氧基苯基(锡(IV))的结构

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The structures of tetra(m-methoxyphenyl)tin (1) and tetra(o-methoxyphenyl)tin (2) have been determined at 225 and 290 K, respectively. Crystal data: (1), m.p. 361.5-362.5 K, monoclinic, C2/c, a = 17.534(5), b = 9.908(4), c = 30.011(13) A, β = 108.27 (3)°, V = 4951 (3) A3, Z = 8, Dx = 1.468 Mgirr3, n = 1.06mm~(-1), R = 0.021 for 3989 observed reflections [1 > 3tr(I)]; (2), m.p. 447-449K, triclinic, PI, a = 9.145(6), b= 16.562(5), c = 18.010 (8) A, a = 77.72(3), 3 = 78.52(5), 7 = 81.70(4)°, V = 2597 (2) A3, Z = 4, Dx = 1.399 MgnT3, p, = 8.24 mm~(-1), R = 0.037 for 6993 observed reflections [I > 3a(T)]. For (1), the molecular structure completely deviates from the usual 4 symmetry found for the para-analogue, but molecules of (2) have distorted 4 symmetries with the methoxy groups having the all-exo conformation. The occurrence of these unsymmetric structures is attributed to the need to maximize crystal lattice stability to offset, in the case of (1), the exigent packing requirements of the meta-CH3O groups, and in the case of (2), the intrinsically high molecular energy compared with the tetraphenyl archetype.
机译:四(间甲氧基苯基)锡(1)和四(邻甲氧基苯基)锡(2)的结构分别在225 K和290 K下测定。晶体数据:(1),熔点361.5-362.5 K,单斜晶,C2 / c,a = 17.534(5),b = 9.908(4),c = 30.011(13)A,β= 108.27(3)°,V = 4951(3)A3,Z = 8,Dx = 1.468 Mgirr3,n = 1.06mm〜(-1),对于3989个观察到的反射,R = 0.021 [1> 3tr(I)]; (2),熔点447-449K,三斜线,PI,a = 9.145(6),b = 16.562(5),c = 18.010(8)A,a = 77.72(3),3 = 78.52(5),7 = 81.70(4) °,V = 2597(2)A3,Z = 4,Dx = 1.399 MgnT3,p = 8.24 mm〜(-1),R = 0.037,观察到6993个反射[I> 3a(T)]。对于(1),分子结构完全偏离对位类似物发现的通常的4个对称性,但是(2)的分子扭曲了4个对称性,其中甲氧基具有全-外构象。这些不对称结构的出现归因于需要最大化晶格稳定性以抵消(1)情况下偏CH3O基团的紧迫填充要求,而对于(2)情况则要求本征高分子能与四苯基原型相比。

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