US EPA

577018 

Journal Article 

Self-assembled [2 × 1 + 1 × 2] heterotetranuclear CuII3MnII/CuII3CoII and [2 × 2 + 1 × 3] heptanuclear CuII7 compounds derived from N,N'-o-phenylenebis(3-ethoxysalicylaldimine): Structures and magnetic properties 

Nayak, M; Hazra, S; Lemoine, P; Koner, R; Lucas, CR; Mohanta, S 

2008 

1 

Polyhedron
ISSN: 02775387 

27 

4 

1201-1213 

10.1016/j.poly.2007.12.010 

WOS:000255619500010 

The mononuclear copper(II) compound [CuIIL1[subset of](H2O)] (1) derived from the hexadentate Schiff base compartmental ligand N,N'-o-phenylenebis(3-ethoxysalicylaldimine) (H2L1) has been characterized from its IR spectrum as an inclusion product. Reaction of 1 with Cu(ClO4)2 · 6H2O leads to the formation of an interesting [2 × 2 + 1 × 3] heptanuclear copper(II) complex [{CuIIL1CuII(H2O)3}2 {CuIIL1}3](ClO4)4 · 2CH3COCH3 (2), in which two monophenoxo-bridged dinuclear [CuIIL1CuII(H2O)3]2+ cationic units are self-assembled and cocrystallized with three mononuclear [CuIIL1] complex units through the hydrogen bonded web formed between the coordinated water molecules and the phenoxo/ethoxy oxygens. Similar reactions of 1 with Co(ClO4)2 · 6H2O or Mn(ClO4)2 · 6H2O produce the [2 × 1 + 1 × 2] heterotetranuclear complexes [{CuIIL1MII(H2O)3}{CuIIL1}2](ClO4)2 · H2O · CH3COCH3 (M = Co (3), M = Mn (4)) in which one diphenoxo-bridged heterodinuclear [CuIIL1MII(H2O)3]2+ cationic unit is self-assembled and cocrystallized with two mononuclear [CuIIL1] units through hydrogen bonding. The structures of 2 and 4 have been determined. Variable-temperature (2-300 K) magnetic susceptibility measurements of 2-4 have been carried out. In all these cases, the metal centers in the bimetallic units are involved in antiferromagnetic exchange interactions with J = -22.2 cm-1, -16.7 cm-1, and -15.9 cm-1 for 2-4, respectively. 

Cocrystal; Self-assembled; Heptanuclear; Tetranuclear; Inclusion compound; Water