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Use of the Sulfato Ligand in 3d‐Metal Cluster Chemistry: A Family of Hexanuclear Nickel(II) Complexes with 2‐Pyridyl‐Substituted Oxime Ligands
Author(s) -
Papatriantafyllopoulou Constantina,
Aromi Guillem,
Tasiopoulos Anastasios J.,
Nastopoulos Vassilios,
Raptopoulou Catherine P.,
Teat Simon J.,
Escuer Albert,
Perlepes Spyros P.
Publication year - 2007
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.200700063
Subject(s) - chemistry , oxime , nickel , crystallography , ligand (biochemistry) , magnetic susceptibility , ketone , antiferromagnetism , cluster chemistry , metal , stereochemistry , medicinal chemistry , organic chemistry , biochemistry , physics , receptor , condensed matter physics
The initial use of 2‐pyridyl‐substituted oximes [(py)C(R)NOH; R = Me, Ph]/sulfate blend in nickel(II) chemistry has yielded a family of hexanuclear clusters. The syntheses, structures and magnetic properties are reported of [Ni 6 (SO 4 ) 4 (OH){(py)C(Me)NO} 3 {(py)C(Me)NOH} 3 (MeOH) 2 (H 2 O)] ( 1 ),[Ni 6 (SO 4 ) 4 (OH){(py)C(ph)NO} 3 {(py)C(ph)NOH} 3 (MeOH) 3 ] ( 2 )and [Ni 6 (SO 4 ) 4 (OH){(py)C(ph)NO} 3 {(py)C(ph)NOH} 3 (H 2 O) 3 ] ( 3 ), where (py)C(Me)NOH is methyl 2‐pyridyl ketone oxime and (py)C(ph)NOH is phenyl 2‐pyridyl ketone oxime. The hexanuclear molecules present in the three complexes have similar structures which contain the [Ni 6 (μ 3 ‐OH)(μ 3 ‐SO 4 ) 3 (μ 3 ‐ONR) 3 ] 2+ core. The core consists of six Ni II ions arranged as two parallel equilateral triangular subunits, one small (Ni ··· Ni ca. 3.3 Å) and the other larger (Ni ··· Ni ca. 6.0 Å). Characteristic IR bands are discussed in terms of the known structures of 1 – 3 . The magnetic properties of 1 and 2 have been studied by variable‐temperature dc magnetic susceptibility techniques which indicate antiferromagnetic interactions. A simple 2‐ J model was found to be adequate to describe the similar thermal variation of the molar magnetic susceptibilities of 1 and 2 .(© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007)