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Thermochromic solids

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Jeffrey G. Hughes

RMIT University, Melbourne, AUSTRALIA

J. Chem. Educ., 1998, 75 (1), p 57

DOI: 10.1021/ed075p57

Publication Date (Web): January 1, 1998

Section:

History, Education, and Documentation

Abstract

Thermochromism is the reversible change of color of a solid when it is heated or cooled. Previous reported examples of thermochromic solids involve color changes due to changes of stereochemistry. Salts of mercuric iodide, M₂HgI₄ [M=Cu(I), Ag(I)] are easily prepared and exhibit sharp, reversible thermochromic transitions at moderately low temperatures. The Ag(I) solid changes color from yellow to orange at 50 °C and the Cu(I) solid at 67 °C. The color changes are due to subtle changes in crystal structure. Signs can be prepared for lecture demonstrations using pieces of filter paper saturated in the solids

Keywords (Audience):

High School / Introductory Chemistry

Keywords (Domain):

Demonstrations

Keywords (Feature):

Tested Demonstrations

Keywords (Subject):

Coordination Compounds

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Citing Articles

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This article has been cited by 5 ACS Journal articles (5 most recent appear below).

Solid-State Thermochromism and Phase Transitions of Charge Transfer 1,3-Diamino-4,6-dinitrobenzene Dyes
Jong Hoon Lee, Panče Naumov, Ihn Hee Chung, and Sang Cheol Lee
The Journal of Physical Chemistry A2011 Article ASAP
- Solid-State Thermochromism and Phase Transitions of Charge Transfer 1,3-Diamino-4,6-dinitrobenzene Dyes
  Jong Hoon Lee, Panče Naumov, Ihn Hee Chung, and Sang Cheol Lee
  The Journal of Physical Chemistry A2011 Article ASAP
  The lower 1,3-bis(hydroxyalkylamino) homologues of the strong intramolecular X-type charge transfer (CT) system 1,3-diamino-4,6-dinitrobenzene (DADNB) exhibit reversible color change in the solid state from yellow at room temperature (RT) to orange and ...
  Abstract | Full Text HTML | Hi-Res PDF | PDF w/ Links
Preparation and Thermochromic Properties of Copper(II)-N,N-Diethylethylenediamine Complexes
Ai-Li Cui, Xi Chen, Long Sun, Jing-Zhi Wei, Jin Yang, and Hui-Zhong Kou
Journal of Chemical Education2011 88 (3), 311-312
- Preparation and Thermochromic Properties of Copper(II)-N,N-Diethylethylenediamine Complexes
  Ai-Li Cui, Xi Chen, Long Sun, Jing-Zhi Wei, Jin Yang, and Hui-Zhong Kou
  Journal of Chemical Education2011 88 (3), 311-312
  The synthesis and characterization of two copper(II) complexes, [Cu(deen)2](BF4)2 and [Cu(deen)2](NO3)2 (deen = N,N-diethylethylenediamine), that show interesting thermochromic properties, are described. The subtle alternation of coordination geometry ...
  Abstract | Full Text HTML | Hi-Res PDF | PDF w/ Links
Preparation and Properties of a Spectacular Thermochromic Solid
Miha Bukleski and Vladimir M. Petruševski
Journal of Chemical Education2009 86 (1), 30
- Preparation and Properties of a Spectacular Thermochromic Solid
  Miha Bukleski and Vladimir M. Petruševski
  Journal of Chemical Education2009 86 (1), 30
  Describes the synthesis of a complex [(CH3)2NH2]2NiCl4 that transitions between three colors and is ideal for demonstrating multiple thermochromic transitions in a single solid.
  Abstract | Hi-Res PDF | PDF w/ Links
Solid-State Synthesis of a Thermochromic Compound
Chen Changyun , Zhou Zhihua , Zhou Yiming and Du Jiangyan
Journal of Chemical Education2000 77 (9), 1206
- Solid-State Synthesis of a Thermochromic Compound
  Chen Changyun , Zhou Zhihua , Zhou Yiming and Du Jiangyan
  Journal of Chemical Education2000 77 (9), 1206
  Bis(diethylammonium) tetrachloronickelate(II) was prepared by solid-state reaction at mild temperature. Classroom demonstration of the synthesis and discussions of thermochromic mechanism of the compound prepared were described.
  Abstract | Hi-Res PDF | PDF w/ Links
Thermochromism in Commercial Products
Mary Anne White and Monique LeBlanc
Journal of Chemical Education1999 76 (9), 1201
- Thermochromism in Commercial Products
  Mary Anne White and Monique LeBlanc
  Journal of Chemical Education1999 76 (9), 1201
  Many commercial products change color with a change of temperature. How do they do it? The processes responsible for the two major categories of commercial thermochromic coloring agents are presented, along with a description of applications of ...
  Abstract | Hi-Res PDF | PDF w/ Links