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Structure and Antiferromagnetism of Trinuclear Heterometallic Strings Containing Mn II –M II –Mn II Frameworks (M = Ni, Pd, Pt)
Author(s) -
Yu LiChung,
Lee GeneHsiang,
Sigrist Marc,
Lin TienSung,
Peng ShieMing
Publication year - 2016
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/ejic.201600835
Subject(s) - chemistry , antiferromagnetism , crystallography , electron paramagnetic resonance , ion , metal , paramagnetism , square pyramidal molecular geometry , amide , metal ions in aqueous solution , crystal structure , nuclear magnetic resonance , condensed matter physics , physics , organic chemistry
The syntheses, crystal structures, and magnetic properties of three trinuclear, symmetric, heterometal string complexes stabilized by four dipyridylamide (dpa) ligands were explored. MnNiMn(dpa) 4 Cl 2 ( 1 ), MnPdMn(dpa) 4 Cl 2 ( 2 ), and MnPtMn(dpa) 4 Cl 2 ( 3 ) were found to exhibit an approximate D 4 symmetry and a linear metal framework helically wrapped by four syn–syn‐type ligands. The center metal ions bond with the amide part of dpa – in a square‐planar environment, and the outer Mn ions bond with Cl – and the pyridyl part of dpa – in a square‐pyramidal environment. The magnetic susceptibilities of these three compounds showed antiferromagnetic interactions (2J = –13.7 cm –1 for 1, –29.7 cm –1 for 2, and –66.2 cm –1 for 3 in the Heisenberg exchange framework) between the MnII magnetic centers. The value of 2J increased with increasing atomic number of the central metal ion. The antiferromagnetic properties were further confirmed by electron paramagnetic resonance spectroscopy studies in variable‐temperature measurements.