Can anyone give an example about a piezochromic material?

Question

Hi
I am searching for a piezochromic material, if any one has any knowledge about it I would really appreciate it

Answer 1

1 11-(3'-Oxodihydrobenzothiophen-2'-ylidene)cyclopenta[1,2-b:4,3-b']dibenzothiophene
2 organic molecules ( such as N-salicylidene-2-chloroaniline
[3172-42-7] ), metal cluster compounds ( such as the octahalodirhenates,
(Re2X8)2-, where X=Cl,Br,I ), and copper (II) organic complexes with
compounds like ethylene diamine. They are still being researched, and
interested readers should investigate the references in the Kirk Othmer
monograph [8].