Premium
Synthesis of 1,8‐Anthracene–Ethenylene Cyclic Dimers and Related Compounds: Effects of Linkers on their Structures, Electronic Properties, and Dynamic Behavior
Author(s) -
Inoue Masataka,
Iwanaga Tetsuo,
Toyota Shinji
Publication year - 2017
Publication title -
asian journal of organic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.846
H-Index - 44
eISSN - 2193-5815
pISSN - 2193-5807
DOI - 10.1002/ajoc.201700046
Subject(s) - chemistry , anthracene , ethylene , molecular orbital , absorption spectroscopy , atomic orbital , electronic effect , computational chemistry , catalysis , photochemistry , molecule , organic chemistry , physics , quantum mechanics , electron
Cyclic compounds consisting of two 10‐mesityl‐1,8‐anthracene units with trans ‐ or cis ‐ethenylene linkers and their ethynylene and ethylene analogs were synthesized by cross‐coupling reactions and catalytic hydrogenation reactions. The structures of the four compounds were investigated by X‐ray analysis and DFT calculations. The trans ‐ethenylene and ethylene compounds had nonplanar stair‐like frameworks, whereas the cis ‐ethenylene compound had a rigid folded framework. In the UV/Vis spectra, the absorption bands red‐shifted in the order of ethylene, cis ‐ethenylene, trans ‐ethenylene, and ethynylene compounds according to an increase in π‐conjugation. The fluorescence spectra showed that these compounds were emissive in solution as well as in the solid state. Dynamic processes involving the exchange between the two syn forms were observed for the trans ‐ethenylene and ethylene compounds by variable temperature 1 H NMR measurements. The effects of linkers on electronic properties and dynamic behavior are discussed on the basis of their molecular structures and molecular orbitals.