Two New Supramolecular Architectures of Singly Phenoxo-Bridged Copper(II) and Doubly Phenoxo-Bridged Manganese(II) Complexes Derived from an Unusual ONOO Donor Hydrazone Ligand: Syntheses, Structural Variations, Cryomagnetic, DFT, and EPR Studies
✍ Scribed by Aurkie Ray; Corrado Rizzoli; Guillaume Pilet; Cédric Desplanches; Eugenio Garribba; Eva Rentschler; Samiran Mitra
- Publisher
- John Wiley and Sons
- Year
- 2009
- Tongue
- English
- Weight
- 1011 KB
- Volume
- 2009
- Category
- Article
- ISSN
- 1434-1948
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✦ Synopsis
Abstract
Two new coordination complexes {[(L)Cu~2~(μ‐L)(NO~3~)(CH~3~OH)~0.3~(H~2~O)~0.7~]·NO~3~}[Cu(L)(NO~3~)(CH~3~OH)] (1) and [Mn~2~(μ‐L)~2~(H~2~O)(μ~1~‐N~3~)~2~(CH~3~OH)] (2) derived from (E)‐N′‐(2‐hydroxy‐3‐methoxybenzylidene)acetohydrazide [LH] have been synthesized. The new potentially tetradentate ONOO donor hydrazone ligand [LH] has shown considerable metal ion selective phenoxo bridging in 1 and 2. It has coordinated copper(II) ions in its tridentate as well as in tetradentate fashion whereas for manganese(II) ions it solely showed its tetradentate character. In 1 the two adjacent pentacoordinate copper(II) centers are connected by a rare single phenoxo linkage of the hydrazone ligand whereas 2 is a doubly phenoxo‐bridged heptacoordinated manganese(II) dinuclear species. The 3D supramolecular networks of 1 and 2 have resulted from extensive H‐bonding interactions in the respective complexes. Structural variations observed for 1 and 2 have been described by performing single‐crystal X‐ray analysis. The ligand and the complexes are characterized by elemental analyses, IR, UV/Vis and ^1^H NMR spectroscopy. Cryomagnetic investigations, DFT studies and EPR analysis, of 1 and 2 have also been studied in detail.(© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)