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Novel μ 3 ‐Coordination of Urea at a Nickel(II) Site: Structure, Reactivity and Ferromagnetic Superexchange
Author(s) -
Meyer Franc,
Konrad Matthias,
Kaifer Elisabeth
Publication year - 1999
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/(sici)1099-0682(199911)1999:11<1851::aid-ejic1851>3.0.co;2-f
Subject(s) - chemistry , superexchange , nickel , molecule , ferromagnetism , inorganic chemistry , urea , spin states , crystallography , magnetic moment , ion , photochemistry , organic chemistry , condensed matter physics , physics
A tetranuclear mixed‐spin nickel(II) complex featuring two urea molecules in an unprecedented μ 3 ‐ĸN:ĸN′:ĸO coordination mode has been structurally characterized. The two central high‐spin nickel(II) ions exhibit ferromagnetic coupling ( J = +3.4 cm −1 ) mediated by the NH 2 –C–O linkages of the bridging urea. In solution the temperature dependence of the UV/Vis optical absorption and of the magnetic moment indicate that, upon cooling, additional solvent molecules bind to the terminal low‐spin metal ions and a concomitant spin change occurs. In the solid state the coordinated urea ligands can be thermally degraded to cyanate within the grip of the multimetallic nickel(II) site.