A new polymorph of tri(p-tolyl)boroxine

被引：9

作者：

Haberecht, MC ^{[1
]}

Bolte, M ^{[1
]}

Wagner, M ^{[1
]}

Lerner, HW ^{[1
]}

机构：

[1] Univ Frankfurt, Inst Anorgan Chem, D-60439 Frankfurt, Germany

来源：

JOURNAL OF CHEMICAL CRYSTALLOGRAPHY | 2005年 / 35卷 / 09期

关键词：

boroxine; Lewis acidity; polymorphism; intermolecular B-O distances;

D O I：

10.1007/s10870-005-3325-y

中图分类号：

O7 [晶体学];

学科分类号：

0702 ; 070205 ; 0703 ; 080501 ;

摘要：

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).

引用

页码：657 / 665

页数：9

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