Abstract

Based on 2,2':6',2''-terpyridine ligands (L1), five terpyridine derivatives, namely 4'-carbazol-9-yl-2,2':6',2''-terpyridine (L2), 4'-diphenylamino-2,2':6',2''-terpyridine (L3), 4'-bis(4-tert-butylphenyl)amino-2,2':6',2''-terpyridine (L4), 4'-[naphthalen-1-yl-(phenyl)amino]-2,2':6',2''-terpyridine (L5), 4'-[naphthalen-2-yl(phenyl)amino]-2,2':6',2''-terpyridine (L6) and their corresponding Re(I) complexes ReLn(CO)3Cl (n =1-6) have been synthesized and characterized by elemental analysis and 1H NMR spectroscopy. The X-raycrystal structure of ReL3(CO)3Cl has also been obtained. The luminescence spectra of ReL2(CO)3Cl-ReL5(CO)3Cl, obtained in CH2Cl2 solution at room temperature, show strong d? (Re) -> ?* (diimine) MLCT character(?max ~ 600 nm) and a small red shift relative to ReL1(CO)3Cl. This, confirmed by the study of thetriplet energy levels of the L1-L6 ligands at low temperature (77 K rigid matrix), indicates that the introductionof electron-donating moieties on the terpyridine unit decreases the triplet levels of the ligands,leading to a reduction of the energy gap between d and ?* orbitals. In the solid state, upon MLCT excitation,all the complexes show an even stronger emission and a blue spectral shift (?max ~ 550 nm) comparedto those obtained in solution.

Autore Pugliese

• Accorsi Gianluca

Tutti gli autori

• Wang D.; Xu Q.L.; Zhang S.; Li H.Y.; Wang C.C.; Li T.Y.; Jing Y.M.; Huang W.; Zheng Y.X.; Accorsi G.

Titolo volume/Rivista

Dalton transactions

Anno di pubblicazione

2013

ISSN

1477-9226

ISBN

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Numero di citazioni Wos

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Numero di citazioni Scopus

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Settori ERC

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Codici ASJC

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