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Synthesis, Structures, and Properties of Lanthanide Complexes with Pyrimidine‐2‐carboxylic Acid
Author(s) -
Wang Panpan,
Chen Wenlan,
Xia Jun
Publication year - 2017
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.201700272
Subject(s) - isostructural , lanthanide , chemistry , crystallography , ligand (biochemistry) , hydrogen bond , circular dichroism , crystal structure , carboxylic acid , stereochemistry , molecule , polymer chemistry , organic chemistry , ion , biochemistry , receptor
Six lanthanide complexes [ Ln (pmc) 2 NO 3 ] n [Hpmc = pyrimidine‐2‐carboxylic acid, Ln = La ( 1 ), Pr ( 2 )], [ Ln (pmc) 2 (H 2 O) 3 ]NO 3 · H 2 O [ Ln = Eu ( 3 ), Tb ( 4 ) Dy ( 5 ), Er ( 6 )] were synthesized by the reactions of lanthanide nitrate and pyrimidine‐2‐carboxylic acid in water at room temperature. These complexes were characterized by single‐crystal X‐ray diffraction analysis, elemental analysis, IR, circular dichroism (CD) and fluorescence spectra. Structure analysis shows that complexes 1 and 2 are isostructural with P 4 3 2 1 2 space group, whereas isostructural complexes 3 – 6 belong to the P 2 1 /c space group. In complexes 1 and 2 , the central metal atoms are coordinated by nitrates and pmc – , which are self‐assembled to construct a 3D porous network with 6 2 .6 2 .6 2 .6 2 .6 2 .6 2 (6 6 ) topology. In complexes 3 – 6 , H 2 O and pmc – ligands are coordinated and the complexes exhibit a one‐dimensional zigzag chain, which is further expanded into a 3D structure by hydrogen bonding. In addition, the circular dichroism of 1 and 2 proves that the two complexes are both chiral with achiral ligand of Hpmc. Luminescent measurements of compounds 3 – 5 indicate that the characteristic fluorescence of Eu 3+ , Tb 3+ , and Dy 3+ are observed.