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A new polymorph of tri(p-tolyl)boroxine

机译:三(对甲苯基)环硼氧烷的新多晶型物

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A new orthorhombic polymorph of tri(p-tolyl)boroxine (Pmn2(1)) with relatively short intermolecular B-O distances of 3.321 angstrom was crystallized from CDCl3 at ambient temperature. The crystal structure of the orthorhombic polymorph of tri(p-tolyl)boroxine shows the shortest intermolecular B-O contact yet found in boroxines. The cell dimensions of the orthorhombic polymorph of tri(p-tolyl)boroxine are a = 21.888(4) angstrom, b = 9.304(2) angstrom, and c = 4.7804(10) angstrom. The structural features of the orthorhombic polymorph of tri(p-tolyl)boroxine are quite different from a previously reported monoclinic (Beckett et al., J. Organomet. Chem. 1997, 535, 33-41) but similar to that of tri(p-bromophenyl)boroxine (Avent et al., Coll. Czech. Chem. Commun. 2002, 67, 1051-1060). Obviously, electronic effects of substituents on the boron centers influence the structural features of substituted boroxines less than discussed in earlier reports (Boese et al., Angew. Chem. 1987, 99, 239-241).
机译:在环境温度下,从CDCl3中结晶出新的斜方晶型的三(对甲苯基)环硼氧烷(Pmn2(1)),其分子间B-O距离较短,为3.321埃。三(对甲苯基)环硼氧烷的正交多晶型物的晶体结构显示出在环硼氧烷中发现的最短的分子间B-O接触。三(对甲苯基)环硼氧烷的正交晶型的晶胞尺寸为a = 21.888(4)埃,b = 9.304(2)埃和c = 4.7804(10)埃。三(对甲苯基)环硼氧烷的正交多晶型物的结构特征与先前报道的单斜晶系(Beckett等人,J. Organomet.Chem。1997,535,33-41)完全不同,但与三(对甲苯基)对-溴苯基)环硼氧烷(Avent等,Coll。Czech。Chem。Commun。2002,67,1051-1060)。显然,取代基对硼中心的电子作用对取代的硼氧烷的结构特征的影响要小于早期报道中所讨论的(Boese等人,Angew.Chem.1987,99,239-241)。

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