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author:

Wang, G. (Wang, G..) [1] | Wei, Y. (Wei, Y..) [2] | Wu, K. (Wu, K..) [3]

Indexed by:

Scopus

Abstract:

Two coordination complexes EuII 2EuIII 4(OH)4(bza)4L2(1) and EuIII 5(H2O)(OH)4(NO3)3(bza)4L (2) have been assembled with the tetrasubstituted cyclen ligand N,N′,N′′,N′′′-tetrakis(2-hydroxy-3-methoxy-5-methylbenzyl)-1,4,7,10-tetraazacyclododecane (H4L) and the auxiliary ligand benzoic acid (Hbza). Complex 2 is a pentanuclear EuIIIcluster whereas complex 1 is a huge heterovalent 2EuII/4EuIIIcluster in which two divalent europium ions are trapped within the macrocyclic cavities of the designed ligands L and are further isolated from the environment by peripheral phenyl rings and the tetrahedral 4EuIIIcluster, which results in the enhanced oxidative stability of Eu2+. The luminescence of complex 1 was investigated and is discussed in comparison with the luminescence of ligand H4L and complex 2. Owing to the protection of Eu2+by the macrocyclic ligands L, the heterovalent complex exhibits a strong broad emission band with a maximum at 533 nm as well as the characteristic sharp emissions of Eu3+. The broad emission is redshifted compared with that of ligand H4L and has been attributed to the Laporte-allowed 4f65d1→ 4f7transition of Eu2+. © 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

Keyword:

Cyclic voltammetry; Europium; Luminescence; Oxidative stability

Community:

  • [ 1 ] [Wang, G.]State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, 155 Yangqiao Road West, Fuzhou, 350002, China
  • [ 2 ] [Wang, G.]College of Chemistry, Fuzhou University, 2 Xue Yuan Road, University Town, Fuzhou, 350108, China
  • [ 3 ] [Wei, Y.]State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, 155 Yangqiao Road West, Fuzhou, 350002, China
  • [ 4 ] [Wu, K.]State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, 155 Yangqiao Road West, Fuzhou, 350002, China

Reprint 's Address:

  • [Wei, Y.]State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, 155 Yangqiao Road West, China

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Source :

European Journal of Inorganic Chemistry

ISSN: 1434-1948

Year: 2016

Issue: 24

Volume: 2016

Page: 3927-3931

2 . 4 4 4

JCR@2016

2 . 2 0 0

JCR@2023

ESI HC Threshold:235

JCR Journal Grade:2

CAS Journal Grade:2

Cited Count:

WoS CC Cited Count:

SCOPUS Cited Count: 1

ESI Highly Cited Papers on the List: 0 Unfold All

WanFang Cited Count:

Chinese Cited Count:

30 Days PV: 0

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