MOLECULAR MOTIONS IN FLUCTIONAL CRYSTALS - N-BASE ADDUCTS OF BIS(1,5-CYCLOOCTANEDIYLBORYL) OXIDE

被引：5

作者：

YALPANI, M ^{[1
]}

KOSTER, R ^{[1
]}

BOESE, R ^{[1
]}

机构：

[1] UNIV ESSEN GESAMTHSCH,INST ANORGAN CHEM,W-4300 ESSEN 1,GERMANY

来源：

CHEMISCHE BERICHTE-RECUEIL | 1992年 / 125卷 / 02期

关键词：

BIS(1,5-CYCLOOCTANEDIYLBORYL) OXIDE, N-BASE ADDUCTS OF, SOLID STATE NMR OF; FLUCTIONAL CRYSTALS; CRYSTAL DYNAMICS; PHASE TRANSFORMATIONS;

D O I：

10.1002/cber.19921250206

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The adducts of bis(1,5-cyclooctanediylboryl) oxide (1) with quinuclidine (2a) and with pyridine (2b) show an unusually large premelting endothermic phase transition. 2a has been investigated by B-11-NMR spectroscopy in the solid state and at various temperatures in its mesophase. The significant differences in the lattice packings of the molecules of the thermally stable adducts of 1 with 4-methyl-, 3-bromo-, and 4-(dimethylamino)pyridine (2c-e; X-ray structural analysis) from those of 2a and 2b suggests that it is the unique molecular arrangement in the respective lattices of the latter two adducts which allows a smooth transition to a two-dimensionally ordered mesophase. This is stabilized by intermolecular fluctuation of the N-base molecules between the boron atoms of the neighbouring molecules of 1.

引用

页码：309 / 313

页数：5

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