Photoluminescence Properties of trans–4,4'–Diamino–stilbene in Poly(vinyl alcohol) Films

1996 ◽  
Vol 51 (10-11) ◽  
pp. 1153-1156 ◽  
Author(s):  
A. Kawski ◽  
A. Kubicki ◽  
B. Kukliński ◽  
T. Nowosielski
Keyword(s):  
Vinyl Alcohol ◽  
Experimental Studies ◽  
Poly Vinyl Alcohol ◽  
Photoluminescence Properties ◽  
Emission Anisotropy ◽  
Distinct Effect ◽  
Unusual Behaviour ◽  
Nonpolar Molecule ◽  
Direct Irradiation ◽  
Fluorescence And Phosphorescence

Abstract Experimental studies have shown that the nonpolar molecule 4,4'-diamino-stilbene (DAS) in poly(vinyl alcohol) film (PVA) at 296 K, apart from fluorescence displays phosphorescence whose intensity differs only slightly from that observed at 84 K. The overlapping of fluorescence and phosphorescence bands is the reason of the unusual behaviour of the emission anisotropy in the longwave absorption and photoluminescence bands. A distinct effect of direct irradiation on the intensity of these bands was observed.

scholarly journals Photoselection of Luminescent Molecules in Anisotropic Media in the Case of Two-Photon Excitation. Part II. Experimental Studies of Hoechst 33342 in Stretched Polyvinyl alcohol) Films

1996 ◽  
Vol 51 (9) ◽  
pp. 1037-1041 ◽  
Author(s):  
A. Kawski ◽  
Z. Gryczyński ◽  
I. Gryczyński ◽  
J. R. Lakowicz ◽  
G. Piszczek
Keyword(s):  
Polyvinyl Alcohol ◽  
Vinyl Alcohol ◽  
Experimental Studies ◽  
Poly Vinyl Alcohol ◽  
Hoechst 33342 ◽  
Emission Anisotropy ◽  
Two Photon ◽  
Photon Excitation ◽  
Polyvinyl Alcohol Films ◽  
Two Photon Excitation

Abstract It was found by investigating dichroism and emission anisotropy in the case of one-and two-photon excitation of Hoechst 33342 [bis-benzimide,2,5'-bi-1H-benzimidazole, 2'-(4-ethoxyphenyl)-5-5(4-methyl-1-piperazinyl)] in stretched poly(vinyl alcohol) (PVA) films, that the absorption and fluorescence transition moments lie along the long molecular axis of the molecule studied. The slight deviation of the transition moment direction in fluorescence (about 8°) from that in absorption can be due to the incomplete linearity of the Hoechst molecule.

Unusual Absorption and Fluorescence Properties of p-Substituted Stilbenes in Poly (vinyl alcohol) Films

1995 ◽  
Vol 50 (12) ◽  
pp. 1170-1174
Author(s):  
A. Kawski ◽  
B. Kukliński ◽  
T. Nowosielski
Keyword(s):  
Double Bond ◽  
Polyvinyl Alcohol ◽  
Vinyl Alcohol ◽  
Fluorescence Properties ◽  
Poly Vinyl Alcohol ◽  
Emission Anisotropy ◽  
Unusual Behaviour ◽  
Different Temperatures ◽  
Linear Polyenes ◽  
Linear Molecules

Abstract The behaviour of absorbance, fluorescence and emission anisotropy of linear molecules with one double bond, i.e. 4-amino-4'-nitrostilbene (ANS), 4-dimethylamino-4'-nitrostilbene (DNS) and 4,4'-diphenylstilbene (DPS), was examined in polyvinyl alcohol) (PVA) films at different temperatures (293-423 K). The unusual behaviour of absorption and fluorescence properties of the molecules in­ vestigated, similar to those of linear polyenes in PVA, was, however, less pronounced.

Emission Anisotropy of p-Cyano-N,N-Dialkylanilines in Poly(vinyl alcohol) Film

2003 ◽  
Vol 58 (4) ◽  
pp. 194-196
Author(s):  
A. Kawski ◽  
P. Bojarski ◽  
B. Kukliński
Keyword(s):  
Vinyl Alcohol ◽  
Poly Vinyl Alcohol ◽  
Total Emission ◽  
Temperature Dependent ◽  
Emission Anisotropy ◽  
Transition Moments ◽  
Temperature Enhancement ◽  
Anisotropy Spectra ◽  
Fluorescence And Phosphorescence

The emission anisotropy spectra, r, (λ ) of p-cyano-dimethylaniline (CDMA) and p-cyano-diethylaniline (CDEA) in PVA films are temperature dependent. At 296 K a characteristic dependence of r, (λ ) on the absorption (A), short emission (SE) and long emission (LE) band, responsible for the total emission of fluorescence and phosphorescence is observed. On temperature enhancement to 355 K and next to 380 K the phosphorescence is eliminated. In the case studied the emission anisotropy is positive for the fluorescence bands SE and LE and it attains approximately 0.2, confirming thus that the transition moments’ directions are in these bands parallel.

Isomerization of Diphenyl Polyenes. Part VIII. Absorption and Fluorescence Properties of l-Phenyl-4-diphenylthiophosphinyl Butadiene in Poly (vinyl alcohol) Film

1994 ◽  
Vol 49 (7-8) ◽  
pp. 824-828 ◽  
Author(s):  
A. Kawski ◽  
G. Piszczek ◽  
B. Kukliński ◽  
T. Nowosielski
Keyword(s):  
Vinyl Alcohol ◽  
Thermal Isomerization ◽  
Fluorescence Properties ◽  
Trans Configuration ◽  
Effect Of Temperature ◽  
Poly Vinyl Alcohol ◽  
Direct Irradiation

Abstract The effect of temperature (from 296 to 423 K) upon the absorption and fluorescence of l-phenyl-4-diphenylthiophosphinyl butadiene (PDPB) and of the direct irradiation on the absorbance were investigated in poly(vinyl alcohol) film. It was found that for PDPB in PVA film the transition from cis to trans configuration is only possible as a result of thermal isomerization due to the softening of PVA polymer, whereas photoisomerization results in both cis-to-trans and trans-to-cis transitions. Similar as with 1,4-diphenyl-1,3-butadiene in PVA, the luminescence is due to two, trans-trans and cis-trans, PDPB conformers.

Substituent Effects on the Luminescence of 2-Substituted 3-Methylquinoxalines in Poly (Vinyl Alcohol) Films*

1991 ◽  
Vol 46 (4) ◽  
pp. 304-306 ◽  
Author(s):  
Z. Gryczyński ◽  
A. Kawski
Keyword(s):  
Polyvinyl Alcohol ◽  
Temperature Dependence ◽  
Vinyl Alcohol ◽  
Substituent Effects ◽  
Quantum Yields ◽  
Poly Vinyl Alcohol ◽  
Band Position ◽  
Fluorescence And Phosphorescence ◽  
Polyvinyl Alcohol Films

Abstract The effect of 2-substitutions (NH2 . O, CH3O, CI. Br) in 3-methylquinoxalines on the fluorescence and phosphorescence band position and intensity at 293 K, and the temperature dependence of their fluorescence and phosphorescence quantum yields were investigated in polyvinyl alcohol) films

Isomerization of Diphenyl Polyenes. Part VII. The effect of Daylight and Direct Irradiation on the Photoisomerization of Ph-(CH = CH)n-Ph for n = 2, 3, 4 in Poly(vinyl alcohol) Films

1993 ◽  
Vol 48 (12) ◽  
pp. 1177-1181 ◽  
Author(s):  
A. Kawski ◽  
B. Kukliński ◽  
A. Kubicki
Keyword(s):  
Temperature Effect ◽  
Vinyl Alcohol ◽  
Poly Vinyl Alcohol ◽  
Direct Irradiation

Abstract Photoisomerization of 1,4-diphenyl-1,3-butadiene (DPB), 1,6-diphenyl-1,3,5-hexatriene (DPH) and 1,8-diphenyl-1,3,5,7-octatetraene (DPO) in poly(vinyl alcohol) (PVA) films was studied unter daylight and direct irradiation. The most efficient photoisomerization occurs in the DPB molecule, the smallest among the compounds investigated. For the greatest, DPO, molecule no distinct isomerization was observed in daylight and only a temperature effect was noted. Therefore, the DPO molecule in the PVA film heated to 423 K may serve as a fluorescence standard.

Fluorescence and Phosphorescence Anisotropy Spectra of Indole in Poly (Vinyl Alcohol) Film at Room Temperature

1994 ◽  
Vol 49 (11) ◽  
pp. 1091-1092 ◽  
Author(s):  
A. Kawski ◽  
I. Gryczyński ◽  
Z. Gryczyński
Keyword(s):  
Vinyl Alcohol ◽  
Room Temperature ◽  
Perpendicular Direction ◽  
Poly Vinyl Alcohol ◽  
Indole Ring ◽  
Ring Plane ◽  
Anisotropy Spectra ◽  
Fluorescence And Phosphorescence

Abstract Excitation anisotropy spectra of indole were measured in poly (vinyl alcohol) film at room temperature. The behaviour of the phosphorescence anisotropy of indole in isotropic and anisotropic PVA film enabled a conclusion to be drawn that the T1 - S0 transition is located outside the indole ring plane, close to the perpendicular direction.

High modulus poly (vinyl alcohol) fibers by zone drawing

1986 ◽  
Vol 1 (6) ◽  
pp. 861-869 ◽  
Author(s):  
Paul D. Garrett ◽  
David T. Grubb
Keyword(s):  
Vinyl Alcohol ◽  
Poly Vinyl Alcohol ◽  
High Modulus
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