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Syntheses, Structures, and Magnetism of Trinuclear Zn 2 Ln Complexes with 2,6‐Dipicolinoylbis( N , N ‐diethylthiourea)
Author(s) -
Pham Chien Thang,
Nguyen Thu Ha,
Trieu Thi Nguyet,
Matsumoto Kenji,
Nguyen Hung Huy
Publication year - 2019
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.201900128
Subject(s) - isostructural , crystallography , chemistry , magnetism , ion , bifunctional , crystal structure , coordination number , ligand (biochemistry) , single crystal , lanthanide , magnetic susceptibility , catalysis , physics , biochemistry , receptor , organic chemistry , quantum mechanics
The bifunctional ligand 2,6‐dipicolinoylbis( N , N ‐diethylthiourea) (H 2 L) readily reacts with mixtures of Zn(CH 3 COO) 2 and Ln Cl 3 in MeOH at ambient temperature with formation of trinuclear heterobimetallic complexes [Zn 2 Ln (L) 2 (OAc) 3 ] ( 1a – 1f ) ( Ln = Ce, Nd, Sm, Gd, Dy, Er). The X‐ray single‐crystal diffraction and structural studies of the complexes revealed their isostructural nature, in which two doubly‐charged ligands {L 2– } bind two Zn 2+ ions with the terminal acylthiourea sites and one Ln 3+ ion with the central 2,6‐pyridinedicarboxamide site. In the complexes, the coordination numbers of Ln III and Zn II ions are 9 and 5, respectively. Magnetic properties of the complexes were studied by temperature‐dependent dc magnetic measurements. The observed μ eff values at room temperature are all closed to the calculated values. Fitting χ M and M data of [Zn 2 Gd(L) 2 (OAc) 3 ] ( 1d ) shows a g iso value of 1.94.