ISSN:
0018-019X
Schlagwort(e):
Chemistry
;
Organic Chemistry
Quelle:
Wiley InterScience Backfile Collection 1832-2000
Thema:
Chemie und Pharmazie
Notizen:
Investigations on the Thermochromism of a Series of Spirocyclic Compounds and ‘Colourformers’ with Heterocyclic Parts and O or N as the ‘Key’ Atom.The thermochromism of a series of spirocyclic compounds with heterocyclic parts and O or N as the ‘key’ atom and of ‘colourformers’ was investigated in different solvents such as benzyl alcohol, dimethyl phthalate, decaline, toluence, or xylene. Thermodynamic data for the involed equilibria (ΔH°, ΔS°, and ΔG°298k) and VIS-spectroscopic data were determined and discussed in relation to the ones known spiropyrances. Compounds with O as ‘key’ atom behave very similary to the known spiropyrances, compounds with N as ‘key’ atom mostly are unstable undergoing irreversible bleaching. The ‘colour formers’ usually show only small thermochromic effects and very small equilibrium concentration of the coloured form.
Zusätzliches Material:
2 Tab.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1002/hlca.19890720718
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