METHYL-GROUP TUNNELING STUDIES IN CALIXARENES

被引：8

作者：

CACIUFFO, R

AMORETTI, G

CARLILE, CJ

FILLAUX, F

FRANCESCANGELI, O

PRAGER, M

UGOZZOLI, F

机构：

[1] UNIV PARMA, DIPARTIMENTO FIS, I-43100 PARMA, ITALY

[2] RUTHERFORD APPLETON LAB, DIDCOT OX11 0QX, OXON, ENGLAND

[3] LASIR, CNRS, F-94320 THIAIS, FRANCE

[4] FORSCHUNGSZENTRUM JULICH, INST FESTKORPERFORSCH, W-5170 JULICH 1, GERMANY

[5] UNIV PARMA, IST CHIM GEN & INORGAN, I-43100 PARMA, ITALY

[6] CNR, CTR STRUTTURIST DIFFRATTOMETR, I-43100 PARMA, ITALY

来源：

PHYSICA B-CONDENSED MATTER | 1994年 / 202卷 / 3-4期

关键词：

D O I：

10.1016/0921-4526(94)90306-9

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

Inelastic neutron scattering has been used to study the tunnelling of methyl groups belonging to several guest molecules (toluene, p-xylene, gamma-picoline) incarcerated in a host calixarene matrix. In all the cases investigated, the low tunnel-split librational states of the guest methyl groups. The main line occurs near 0.63 meV, very close to the CH3 quantum free rotor limit. In the toluence complex, the quantum regime persists at least up to 60 K. Effects of coupling between rotational and vibrational modes are discussed. Very subtle structural changes not revealed by diffraction measurements are suggested by the neutron spectroscopy results.

引用

页码：279 / 286

页数：8

共 21 条

[1] ONE-DIMENSIONAL CH3-QUANTUMROTATOR IN SOLID 4-METHYL-PYRIDINE STUDIED BY INELASTIC NEUTRON-SCATTERING [J].