Electron transfer to oriented molecules: Surprising steric effect in t-butyl bromide

<div>A new series of substituted anthranilic esters derivatives linked with a 1,3-dithiolane and</div><div>benzyloximino moiety was synthesized using the simple esterfication reaction and products were</div><div>fully characterized. The isolated yields of these compounds range from 59 to 96%. 1,3-</div><div>dithiolane ester and the benzyloxy substituted diamine derivatives are white solids and stable to</div><div>air and moisture. The synthesized compounds can be exhibits UV-vis absorption properties by</div><div>their structures with a amine or amide group, It is observed that absorption maximum is excellent</div><div>for 2,6-disubstituted benzyloxy esters which can be explained by electron transfer or conjugation</div><div>is steric effect in ortho substitution from the amino group and the amide group.</div>

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A Convenient Synthesis and Spectral Studies of Diamines Derivatives

10.26434/chemrxiv.14776434.v1 ◽

2021 ◽

Author(s):

Sudershan Reddy Gondi ◽

Michael B. Jacobsson ◽

Christiana Julia Rissing ◽

David Y. Son

Keyword(s):

Electron Transfer ◽

Absorption Maximum ◽

Steric Effect ◽

Amide Group ◽

Spectral Studies ◽

Amino Group ◽

Absorption Properties ◽

Convenient Synthesis

<div>A new series of substituted anthranilic esters derivatives linked with a 1,3-dithiolane and</div><div>benzyloximino moiety was synthesized using the simple esterfication reaction and products were</div><div>fully characterized. The isolated yields of these compounds range from 59 to 96%. 1,3-</div><div>dithiolane ester and the benzyloxy substituted diamine derivatives are white solids and stable to</div><div>air and moisture. The synthesized compounds can be exhibits UV-vis absorption properties by</div><div>their structures with a amine or amide group, It is observed that absorption maximum is excellent</div><div>for 2,6-disubstituted benzyloxy esters which can be explained by electron transfer or conjugation</div><div>is steric effect in ortho substitution from the amino group and the amide group.</div>

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Photoexcitation and Electron Transfer Reactions of Zinc Lipidporphyrins in DMSO

Journal of Porphyrins and Phthalocyanines ◽

10.1002/(sici)1099-1409(199901)3:1<53::aid-jpp103>3.0.co;2-b ◽

1999 ◽

Vol 03 (01) ◽

pp. 53-59 ◽

Cited By ~ 3

Author(s):

TAKERU OHGUSHI ◽

ZI-CHEN LI ◽

FU-MIAN LI ◽

TERUYUKI KOMATSU ◽

SHINJI TAKEOKA ◽

...

Keyword(s):

Electron Transfer ◽

Steric Effect ◽

Flash Photolysis ◽

Laser Flash Photolysis ◽

Laser Flash ◽

Transfer Reactions ◽

Quantum Yields ◽

Electron Transfer Reactions ◽

Fluorescence Quantum Yields ◽

Photochemical Properties

The photophysical and photochemical properties of 5,10,15,20-tetrakis{α,α,α,α-o-[2′,2′-dimethyl-20′-((2″-(trimethylammonio)ethyl)phosphonatoxy)alkanamido]phenyl}porphinatozinc(II) (zinc lipidporphyrins, ZnLPs ( C 10, C 18)) have been studied in homogeneous DMSO solution and compared with those of 5,10,15,20-tetrakis{α,α,α,α-o-pivalamidophenyl}porphinatozinc(II) ( ZnTpivPP ) and tetrakis-phenylporphinatozinc(II) ( ZnTPP ). The fluorescence quantum yields of the ZnLPs were lower than that of ZnTPP , but their fluorescence lifetimes were relatively long. The electron transfer reactions from the photoexcited states of these Zn porphyrin complexes to several quinone derivatives were evaluated by fluorescence spectroscopy and laser flash photolysis. The efficiences of oxidative quenching of the excited porphyrins via a dynamic process were significantly decreased by the presence of the bulky substituents on one side of the porphyrin macrocycle. This steric effect of the porphyrin side-chains was quantitatively examined by the Marcus classical treatment.

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