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Synthesis and Crystal Structures of Mono‐Helical Complexes of Zinc(II) and Europium(III) with 1,2‐Bis{[3‐(2‐pyridyl)pyrazol‐1‐yl]ethoxy}ethane
Author(s) -
Lam Michael H. W.,
Lee Derek Y. K.,
Chiu Sammi S. M.,
Man K. W.,
Wong W. T.
Publication year - 2000
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 - 10.1002/1099-0682(200007)2000:7<1483::aid-ejic1483>3.0.co;2-x
Subject(s) - chemistry , europium , denticity , ligand (biochemistry) , zinc , alkoxy group , luminescence , crystallography , photoluminescence , metal , crystal structure , fluorescence , lanthanide , stereochemistry , inorganic chemistry , medicinal chemistry , organic chemistry , ion , receptor , alkyl , biochemistry , physics , optoelectronics , quantum mechanics , optics
A new multidentate ligand L, 1,2‐bis{[3‐(2‐pyridyl)pyrazol‐1‐yl]ethoxy}ethane, has been synthesized by linking two 3‐(pyridin‐2‐yl)pyrazoles with a 1,2‐bis(ethoxy)ethyl spacer. Coordination of L with zinc(II) and europium(III) centres has led to mononuclear complexes of [Zn(L)](ClO 4 ) 2 ( 1 ) and [Eu(L)Cl 2 ](ClO 4 ) ( 2 ). X‐ray crystal structures of both complexes have shown that L adopted a helical coordination geometry around both metal centres. The spectroscopic properties of both complexes have also been determined. In 1 , photoluminescence was dominated by ligand centred 1 (π‐π*) fluorescence. In 2 , ligand‐to‐metal energy transfer leading to 5 D 0 → 7 F n luminescence at the europium(III) centre was observed.