Premium
Two Discrete Lanthanum(III) Complexes with Bulky Aromatic Mixed Ligands: Syntheses, Crystal Structures and Fluorescent Properties
Author(s) -
Yang EnCui,
Dai PeiXia,
Wang XiuGuang,
Zhao XiaoJun
Publication year - 2009
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.200800392
Subject(s) - chemistry , crystallography , square antiprism , stacking , crystal structure , lanthanide , supramolecular chemistry , fluorescence , ligand (biochemistry) , lanthanum , carboxylate , stereochemistry , ion , inorganic chemistry , biochemistry , physics , receptor , organic chemistry , quantum mechanics
Two discrete lanthanide complexes with bulky aromatic mixed‐ligands, {[La 2 (na) 6 (phen) 2 ]·[La 2 (na) 6 (phen) 2 ]} ( 1 ) and [La 2 (na) 6 (2,2′‐bipy) 2 ] ( 2 ) (Hna = 1‐naphthoic acid, phen = 1,10‐phenanthroline, and 2,2′‐bipy = 2,2′‐bipyridine), have been synthesized under hydrothermal conditions and fully characterized by single‐crystal X‐ray crystallography, IR, elemental analysis, TG‐DTA and fluorescence spectra. Structure determination reveals that 1 contains two separate binuclear [La 2 (na) 6 (phen) 2 ] units, in which both crystallographically La III ions are nine‐coordinated with tricapped trigonal prism polyhedron for La1 and a distorted monocapped square antiprism arrangement for La2; whereas 2 has a binuclear structure bridged by carboxylate groups of four na anions. Due to the introduction of bulky aromatic ligands, non‐classical C–H···O H–bonds and π – involved stacking interactions become the dominantly driving forces for the supramolecular structure. The two solid complexes exhibit intense fluorescent emissions at room temperature resulted from the ligand‐to‐metal charge transfer.