Monomeric and polymeric structures of oxovanadium(IV) complexes with Schiff base ligands derived from (R,R)-2,4-pentanediamine - Synthesis and crystal structure

Citation
M. Tsuchimoto et al., Monomeric and polymeric structures of oxovanadium(IV) complexes with Schiff base ligands derived from (R,R)-2,4-pentanediamine - Synthesis and crystal structure, POLYHEDRON, 18(23), 1999, pp. 3035-3039
Citations number
9
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Inorganic & Nuclear Chemistry
Journal title
POLYHEDRON
ISSN journal
0277-5387 → ACNP
Volume
18
Issue
23
Year of publication
1999
Pages
3035 - 3039
Database
ISI
SICI code
0277-5387(1999)18:23<3035:MAPSOO>2.0.ZU;2-L
Abstract
New tetradentate Schiff base-oxovanadium(IV) complexes which have electron donating or withdrawing groups at the 5-position of the salicylaldehyde moi eties, [VO{Xsal-(R,R)-2,4-ptn}] (H-2{Xsal-(R,R)-2,4-ptn}: N,N'-di-Xsalicyli dene-(R,R)-2,4-pentanediamine; X = 5-MeO (methoxy), 5-Br, and 5-NO2) were p repared. The structures and redox potentials for the V(V)IV(IV) couple of t he complexes were compared with those of other [VO{Xsal-(R,R)-2,4-ptn}] (X= 3-EtO (ethoxy), 3-MeO, and H). The 5-MeO substituted complex which has elec tron donating groups at the 5-position of the salicylaldehyde moieties form s a monomeric structure in the solid state. The 3-EtO substituted complex h as both monomeric and polymeric structures. On the other hand, the other [V O{Xsal-(R,R)-2,4-ptn}] (X=H, 3-MeO, 5-Br, 5-NO2) complexes have only polyme ric structures. X-ray crystal structure analysis of [VO{5-MeOsal-(R,R)-2,4- ptn}]. CH3OH (1) was carried out. Complex 1 has a monomeric five-coordinate square-pyramidal structure. The six-membered N-N chelate ring forms a dist orted flattened boat form with two methyl groups in the axial positions. (C ) 1999 Elsevier Science Ltd. All rights reserved.