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Substituted Phenanthrolines as Antennae in Luminescent Eu III Complexes
Author(s) -
Akerboom Sebastiaan,
van den Elshout Jos J. M. H.,
Mutikainen Ilpo,
Siegler Maxime A.,
Fu Wen Tian,
Bouwman Elisabeth
Publication year - 2013
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201301000
Subject(s) - chemistry , luminescence , carboxylate , europium , substituent , ligand (biochemistry) , phenanthroline , crystallography , coordination complex , alkoxy group , crystal structure , lanthanide , stereochemistry , ion , photochemistry , inorganic chemistry , metal , alkyl , organic chemistry , optoelectronics , biochemistry , physics , receptor
Eight novel europium(III)‐based coordination compounds with 1,10‐phenanthroline (phen) ligands with a chloro, methoxy, ethoxy, cyano, carboxylic acid, methyl carboxylate, ethyl carboxylate, and amino substituent on the 2‐position have been prepared in yields ranging from 43 to 89 %. Additionally, one lanthanum(III) coordination compound of 2‐amino‐1,10‐phenanthroline has been isolated. All compounds have the general formula [Ln( L ) 2 (NO 3 ) 3 ], except for the compound with the carboxylate ligand, which has the formula [Eu(O 2 Cphen) 3 ]. Three of the Eu III complexes as well as the La III compound crystal structures have been determined, all of which show similar N 4 O 6 coordination spheres for the Ln III ion. Seven compounds exhibit bright luminescence that is characteristic of Eu III upon irradiation with near‐UV radiation, thus indicating efficient ligand‐to‐metal energy transfer. The complex with 2‐amino‐1,10‐phenanthroline is nonluminescent. The solid‐state photoluminescent quantum yields range from 10 to 79 %, and the luminescence lifetimes vary from 0.43 to 1.57 ms. Analysis of the spectral intensities with the Judd–Ofelt theory shows a significant contribution of nonradiative processes that quench the luminescence of the 5 D 0 level on Eu III .