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Iridium(III)‐Doped Core‐Shell Silica Nanoparticles: Near‐IR Electrogenerated Chemiluminescence in Water
Author(s) -
Kesarkar Sagar,
Rampazzo Enrico,
Valenti Giovanni,
Marcaccio Massimo,
Bossi Alberto,
Prodi Luca,
Paolucci Francesco
Publication year - 2017
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201700071
Subject(s) - iridium , acetonitrile , chemiluminescence , chemistry , photochemistry , nanoparticle , aqueous solution , luminescence , hydrogen peroxide , materials science , catalysis , nanotechnology , organic chemistry , optoelectronics
The electrogenerated chemiluminescence (ECL) properties of two neutral cyclometalated Ir(III) complexes, Ir(iqbt) 2 dpm ( 1 ) and its parent complex fac ‐Ir(iqbt) 3 ( 2 ) [ iqbt =1‐(benzo[b]thiophen‐2‐yl)‐isoquinolinate], have been investigated in acetonitrile solution. Complexes 1 and 2 display near‐infrared (near‐IR) ECL emission in acetonitrile with maxima at 712 and 706 nm, respectively. Species 1 and 2 showed a strong increase in ECL intensity upon employing benzoyl peroxide (BPO) as a co‐reactant with respect to the annihilation. The remarkable continuous ECL emission in near‐IR region makes these complexes promising candidates for development of near‐IR‐emitting Ir‐based labels in diagnostics. Furthermore, encapsulation of complex 1 within silica‐PEG nanoparticles was successfully obtained: the resulting 1@NPs are easily solubilized in aqueous media where remarkable ECL emission was observed even in aerated conditions.