photochromic
/ˌfəʊtə(ʊ)ˈkrəʊmɪk
/adjective
(Of a substance) undergoing a reversible change in colour or shade when exposed to light of a particular frequency or intensity: photochromic sunglasses...
- When a photochromic material is exposed to light, the light absorption properties of the material change.
- Also, photochromic substances can be restored to their original state after being in the dark for a period of time.
- This reversible deprotonation and reprotonation causes the distinguished visible and fully reversible photochromic shift from purple to yellow.
Derivatives
photochromism
- Nagamura et al. have reported photochromism of the ion pair-charge transfer complexes of viologen derivatives with tetrakis [3,5-bis phenyl] borate as a counter anion.
- Investigations of the spiro [cyclohexadiene-indolines] revealed the photochromism to be highly solvent dependent.
- The wide interest for basic and applied research on photochromism in the last decade is well documented by two monographs.
Origin
1950s: from photo- 'relating to light' + Greek khrōma 'colour' + -ic.
Rhymes
- penetralium
- penetrameter
- penetrance
- penetrancy
- penetrant
- penetrate
- penetrating
- penetratingly
- penetration
- penetration agent
- penetration aid
- penetration twin
- penetrative
- penetratively
- penetrativeness
- penetrator
- penetrometer
- pen-feathered
- pen-fed
- penfieldite
- pen-fish
- pen-form
- penfriend
- penfriendship
- Penfro