TY - JOUR
T1 - Relation of solvatochromism and thermochromism to the solvent dielectric constant
T2 - the basis of the ET and E′T polarity scales
AU - Streck, Christof
AU - Richert, Ranko
PY - 1994
Y1 - 1994
N2 - We have measured the thermochromism of pyridinium-N-phenoxide betaine and its penta-tert-butyl substituted derivative dissolved in MTHF together with the solvent dielectric properties in order to relate polarity scales to the dielectric constants of the solvent. Both thermochromism and solvatochromic shifts of the absorption band of the dyes can be rationalized on the basis of the MSA theory for relating the solvation free energy to the static dielectric constant. Deviations between theory and experiment in the regime of higher viscosities can be attributed to changes in the offset between absorption maximum and electronic transition energy.
AB - We have measured the thermochromism of pyridinium-N-phenoxide betaine and its penta-tert-butyl substituted derivative dissolved in MTHF together with the solvent dielectric properties in order to relate polarity scales to the dielectric constants of the solvent. Both thermochromism and solvatochromic shifts of the absorption band of the dyes can be rationalized on the basis of the MSA theory for relating the solvation free energy to the static dielectric constant. Deviations between theory and experiment in the regime of higher viscosities can be attributed to changes in the offset between absorption maximum and electronic transition energy.
UR - http://www.scopus.com/inward/record.url?scp=0028410470&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0028410470&partnerID=8YFLogxK
U2 - 10.1002/bbpc.19940980415
DO - 10.1002/bbpc.19940980415
M3 - Article
AN - SCOPUS:0028410470
SN - 0005-9021
VL - 98
SP - 619
EP - 625
JO - Berichte der Bunsengesellschaft/Physical Chemistry Chemical Physics
JF - Berichte der Bunsengesellschaft/Physical Chemistry Chemical Physics
IS - 4
ER -