Cyclometallated iridium(iii) complexes with substituted 1,10-phenanthrolines: a new class of highly active organometallic second order NLO-phores with excellent transparency with respect to second harmonic emission

Literature Information

Publication Date 2007-08-02
DOI 10.1039/B708073E
Impact Factor 6.222
Authors

Claudia Dragonetti, Stefania Righetto, Renato Ugo, Adriana Valore, Simona Fantacci, Antonio Sgamellotti, Filippo De Angelis


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Abstract

[Ir(ppy)2(5-R-1,10-phen)][PF6] (ppy = cyclometallated 2-phenylpyridine, phen = phenanthroline, R = H, Me, NMe2, NO2) and [Ir(ppy)2(4-R′,7-R′-1,10-phen)][PF6] (R′ = Me, Ph) complexes are characterized by one of the highest second order NLO response (measured by the EFISH technique) reported for a metal complex, mainly due (as suggested by a theoretical SOS-TDDFT investigation) to MLCT processes from the ppy–Ir based moiety acting as donor push system to π* orbitals of phen, acting as an acceptor pull system; the good transparency to the second harmonic emission renders these NLO-phores appealing as building blocks for molecular materials with second harmonic generation.

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