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Defective Double‐Cubane, Tetranuclear Manganese(II) and Cobalt(II) Complexes with Simultaneous μ 1,1 ‐Azido and μ‐O Bridges
Author(s) -
Papaefstathiou Giannis S.,
Escuer Albert,
Raptopoulou Catherine P.,
Terzis Aris,
Perlepes Spyros P.,
Vicente Ramon
Publication year - 2001
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 - 10.1002/1099-0682(200106)2001:6<1567::aid-ejic1567>3.0.co;2-7
Subject(s) - cubane , chemistry , manganese , crystallography , antiferromagnetism , cobalt , ferromagnetism , magnetic susceptibility , stereochemistry , crystal structure , inorganic chemistry , condensed matter physics , physics , organic chemistry
The reactions of M(O 2 CCH 3 ) 2 ·4H 2 O (M= Mn, Co) with di‐2‐pyridyl ketone, (py) 2 CO, and NaN 3 in CH 3 OH or CH 3 OH/H 2 O allow isolation of the tetranuclear compounds [Mn 4 (μ 1,1 ‐N 3 ) 2 (N 3 ) 2 {(py) 2 C(OH)O} 2 {(py) 2 C(OCH 3 )O} 2 ] ( 1 ) and [Co 4 (μ 1,1 ‐N 3 ) 2 (N 3 ) 2 {(py) 2 C(OH)O} 2 {(py) 2 C(OCH 3 )O} 2 ]·2H 2 O ( 2 ). X‐ray diffraction analysis reveals defective double‐cubane tetrameric entities in which the Mn II or Co II atoms are linked by μ 1,1 ‐N 3 bridges and two kinds of O‐bridges. The molar magnetic susceptibility measurements of 1 and 2 in the 2−300 K range indicate weak antiferromagnetic coupling for 1 and clear bulk ferromagnetic coupling for 2 .