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).
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页码：657 / 665
页数：9
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