An NQR and calorimetric study of a phase transition in tetrakis(?-phenylethylamine)-bis(isothiocyanato)nickel(II)/ortho-dichlorobenzene clathrate

Pang, Li; Lucken, Edwin-Anthony; Tissot, Paul

Scientific article

English

An NQR and calorimetric study of a phase transition in tetrakis(?-phenylethylamine)-bis(isothiocyanato)nickel(II)/ortho-dichlorobenzene clathrate

Contributors

Pang, Li; Lucken, Edwin-Anthony; Tissot, Paul

Published in

Zeitschrift für Naturforschung. A, A journal of physical sciences, vol. 47, no. 1-2, p. 251-253

Publication date

1992

Abstract

The ³⁵Cl NQR spectrum of ortho-dichlorobenzene as a guest molecule in tetrakis (α-phenylethylamine)-bis(isothiocyanato)nickel(II), has been studied in the temperature range of 77 K to 250 K. At 77 K the clathrate has two resonances of equal intensity at 35.840 and 36.080 MHz, to be compared with those of pure ortho-dichlorobenzene, where there are three lines at 35.580, 35.775 and 35.824 MHz. At 230 K there occurs an irreversible phase change which results in the expulsion of the orthodichlorobenzene from the host crystal, and the NQR signals thereafter correspond to the three lines of the unclathrated guest molecule. These events were also followed and confirmed by a calorimetric study in the range 210-300 K. The phase change is thought to be due to a transformation of the host molecule, where the thiocyanato groups are in the trans configuration in the clathrate, to the cis configuration, which is known not to form a clathrate.

Keywords

Order-disorder effects
Host-guest interaction
Phase transition
Potential energy

UNIGE affiliation entities

Faculté des sciences / Section de chimie et biochimie / Département de chimie physique

UNIGE research groups

Groupe Lucken

Citation (ISO format)

PANG, Li, LUCKEN, Edwin-Anthony, TISSOT, Paul. An NQR and calorimetric study of a phase transition in tetrakis(?-phenylethylamine)-bis(isothiocyanato)nickel(II)/ortho-dichlorobenzene clathrate. In: Zeitschrift für Naturforschung. A, A journal of physical sciences, 1992, vol. 47, n° 1-2, p. 251–253.

Article (Published version)

Identifiers

PID : unige:2905

Journal ISSN

0932-0784

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Creation

21/09/2009 16:09:40

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21/09/2009 16:09:40

Update

04/04/2025 12:57:49

Status update

09/07/2024 13:27:36

Last indexation

04/04/2025 12:58:14

An NQR and calorimetric study of a phase transition in tetrakis(?-phenylethylamine)-bis(isothiocyanato)nickel(II)/ortho-dichlorobenzene clathrate

Contributors

Published in

Publication date

Abstract

Keywords

UNIGE affiliation entities

UNIGE research groups

Citation (ISO format)

Main files (1)

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Journal ISSN

Technical informations

Creation

First validation

Update

Status update

Last indexation