Untersuchungen über Stilbene. XVII. γ‐Stilbazol‐4′‐aldehyd und γ‐Stilbazol‐4′‐karbonsäure

Drefahl, Günther; Gerlach, Eberhard

doi:10.1002/prac.19580060202

Cited by 5 publications

(1 citation statement)

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“…( E )-4-(4-Methoxystyryl)pyridine. E- Forms of many 4‘-substituted 4-stilbazoles are known, and methods of preparation are available from the literature . ( E )-4-(4-Methoxystyryl)pyridine was prepared by condensing 4-picoline with 4-methoxy benzaldehyde.…”

Section: Methodsmentioning

confidence: 99%

Photoresponsive Change of Oxygen-Binding Affinity of a Cobalt Schiff-Base Complex with an Axially Coordinating Stilbazole Residue of a Copolymer

Suzuki

Oda

et al. 2007

J. Phys. Chem. B

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The reversible binding reaction of oxygen to N,N'-ethylene bis(salicylideneiminato) cobalt(II) (CoS), to which a photoisomerizable stilbazole residue of copolymer 1 coordinated, was investigated. The E form of the stilbazole residues coordinating to CoS, (E)-1-CoS, showed photoisomerization into the Z form, (Z)-1-CoS, on direct ultraviolet irradiation and negligible reverse isomerization. The oxygen-binding equilibrium constant (K) values for (E)-1-CoS and (Z)-1-CoS in toluene were 3.3 x 10(-2) mmHg-1 and 4.8 x 10(-3) mmHg(-1), respectively, at 10 degrees C. Although the pK(a) values of the E and Z forms of the stilbazole residue were similar, the oxygen-binding affinity of (Z)-1-CoS was small in terms of the linear correlation of the logarithm of K (ln K) versus the pK(a). Steric hindrance of the polymer chain of 1 on the coordination of the stilbazole residue of (Z)-1 to CoS was thought to cause the small K. A photoresponsive change of apparent oxygen-binding affinity of 1-CoS along with the E/Z isomerization of the stilbazole residues was observed. The ratio of (Z)-1-CoS converted from (E)-1-CoS by the ultraviolet irradiation could be estimated from analysis of absorption spectra for the oxygen binding of a resulting mixture of (E)-1-CoS and (Z)-1-CoS.

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Section: Methodsmentioning

confidence: 99%