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Self‐Assembly of Nickel(II) Complexes of New Bis‐Bidentate Schiff Base Ligands
Author(s) -
Carbonaro Laura,
Isola Mauro,
Liuzzo Vincenzo,
Marchetti Fabio,
Balzano Federica,
Silvio Pomelli Christian,
Raffaelli Andrea
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(200102)2001:2<353::aid-ejic353>3.0.co;2-e
Subject(s) - chemistry , denticity , pyridine , schiff base , adduct , nickel , stereochemistry , crystallography , medicinal chemistry , crystal structure , organic chemistry
Nickel(II) complexes derived from three new bis‐bidentate Schiff bases, H 2 L 1−3 , having two N ‐ n ‐propyl‐salicylaldiminate units linked by an O−(CH 2 ) n −O spacer ( n = 4, 8, 12, respectively) at the 3‐position of the salicyl moieties, are described. The pyridine adduct of the complex with the shorter spacer forms a cyclic trinuclear structure, [Ni 3 (L 1 ) 3 (py) 6 ] ( 2 ), in the solid state, where each Ni II ion is octahedrally coordinated by two N,O‐bidentate arms of two different ligands and two pyridine nitrogens. The base with n = 8 leads to the double‐helical dinuclear complex, [Ni 2 (L 2 ) 2 ]·THF ( 3 ), which is the first example of a structurally characterised helicate based on a square‐planar N 2 O 2 coordination geometry. In CHCl 3 solution, 3 undergoes a disassembly process which results in an equilibrium mixture where the mononuclear species is largely predominant.