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Thioether Functionalized Pyrazolate Ligands and their Dicopper(II) Complexes – Structures and Magnetic Properties
Author(s) -
Teichgräber Jörg,
Leibeling Guido,
Dechert Sebastian,
Meyer Franc
Publication year - 2005
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.200500127
Subject(s) - thioether , chemistry , crystallography , antiferromagnetism , denticity , ligand (biochemistry) , inductive coupling , planar , metal , stereochemistry , magnetic susceptibility , ion , coupling (piping) , crystal structure , materials science , condensed matter physics , physics , receptor , biochemistry , computer graphics (images) , organic chemistry , quantum mechanics , computer science , metallurgy
A bis(bidentate) compartmental pyrazolate ligand HL with appended methylthiomethyl substituents in the 3‐ and 5‐positions of the heterocycle has been synthesized. It forms doubly pyrazolato bridged dicopper(II) complexes [L 2 Cu 2 ]X 2 (X = NO 3 − ( 3a ), ClO 4 − ( 3b )) with the metal ions in square planar {S 2 N 2 } environment and additional weak axial interactions with the respective counteranions. Magnetic measurements reveal strong antiferromagnetic coupling with J = −243 or −231 cm −1 ( Ĥ = −2 J · S 1 S 2 ), which is at the upper limit of what has previously been observed for bis(μ‐pyrazolato)dicopper(II) complexes.