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Magnesium Tetra(phenylethynyl)porphyrin: Stepwise Synthetic Route, Crystal Structures, and Longer Singlet Excited‐State Lifetime than Zinc Congener
Author(s) -
Nakagawa Takafumi,
Wang Huan,
Zieleniewska Anna,
Okada Hiroshi,
Aoyagi Shinobu,
Guldi Dirk M.,
Matsuo Yutaka
Publication year - 2018
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.201800994
Subject(s) - tetra , porphyrin , congener , zinc , singlet state , magnesium , photochemistry , chemistry , crystal structure , excited state , crystallography , medicinal chemistry , organic chemistry , atomic physics , physics
Magnesium tetra(arylethynyl)porphyrins (aryl=Ph or 4‐CF 3 C 6 H 4 ) were synthesized via 5,15‐di(triisopropylsilylethynyl)‐10,20‐di(arylethynyl)porphyrin to ensure good solubility and high synthetic yields. Magnesium tetra(phenylethynyl)porphyrin was subjected to structural analyses and physico‐chemical characterization. Single‐crystal X‐ray analysis revealed porous crystal structures featuring solvent molecules in their pores. From femtosecond transient absorption measurements we concluded that the singlet excited‐state lifetime of magnesium tetra(phenylethynyl)porphyrin is with 7.4 ns substantially longer than that of its zinc congener with 2.8 ns; this is attributed to the lower atomic weight of magnesium compared with zinc.