%A Deiters,Emmanuel
%A Eliseeva,Svetlana
%A Bünzli,Jean-Claude
%D 2013
%J Frontiers in Chemistry
%C
%F
%G English
%K lanthanides,self-assemby,helicate,dinuclear,bimetallic,stability constants determination,photophysical properties
%Q
%R 10.3389/fchem.2013.00015
%W
%L
%M
%P
%7
%8 2013-September-11
%9 Original Research
%+ Prof Jean-Claude Bünzli,Ecole Polytechnique Fédérale de Lausanne (EPFL),Institute of Chemical Sciences and Engineering,Lausanne,1015,Vaud,Switzerland,jean-claude.bunzli@epfl.ch
%+ Prof Jean-Claude Bünzli,Korea University, Sejong campus,Department of Advanced Materials Chemistry,Seochang-ro 308,Jochiwon-eup,Sejong-si,339-700,Chungcheongnam-do,Republic of Korea,jean-claude.bunzli@epfl.ch
%#
%! Self-assembly of a helical zinc-europium complex
%*
%<
%T Self-assembly of a helical zinc-europium complex: speciation in aqueous solution and luminescence
%U https://www.frontiersin.org/articles/10.3389/fchem.2013.00015
%V 1
%0 JOURNAL ARTICLE
%@ 2296-2646
%X Two new tridentate(NNO)-bidentate(NN) compartmental ligands, HL5 and HL6, are synthesized from pyridine and benzimidazole synthons. They react in aqueous solution under physiological conditions with ZnII, LnIII, or a mixture thereof, to yield complexes of different stoichiometries, 1:3, 2:2, 2:3, 1:1:3, the speciation of which is established by UV-visible titrations and ESI mass spectrometry. Photophysical studies of the EuIII-containing solutions in Tris-HCl 0.1 M (pH = 7.4) show that lanthanide luminescence arises from a unique N6O3 coordination site with pseudo D3 symmetry. Relevant parameters such as crystal field splitting, lifetime, radiative lifetime, and intrinsic quantum yield perfectly match those reported for dinuclear 4f-4f helicates in which the EuIII ion has the same coordination environment.