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Published on: February 7, 2019
Coordinative flexibility in an acyclic bis(sulfonamide) ligand.
Sune Veltzé1, Rune Kirk Egdal, Frank B Johansson
1Department of Physics and Chemistry, University of Southern Denmark, Campusvej 55, 5230, Odense M, Denmark.
Dalton Transactions (Cambridge, England : 2003)
|December 22, 2009
Summary
A new dinucleating ligand, bpsmp(-), forms stable dinuclear metal complexes, particularly with acetate ligands. Acetate bridges are crucial for stabilizing dinuclear structures of cobalt and manganese complexes.
Area of Science:
- Coordination Chemistry
- Organometallic Chemistry
- Materials Science
Background:
- Tertiary sulfonamide groups in ligands offer tunable control over metal complex formation.
- Acyclic dinucleating ligands are valuable for creating multinuclear metal centers.
Purpose of the Study:
- To synthesize and characterize novel dinuclear metal complexes using a new ligand.
- To investigate the influence of ligand structure and auxiliary ligands on complex nuclearity.
Main Methods:
- Synthesis of the acyclic heptadentate dinucleating ligand, 2,6-bis(N,N-bis-(2-pyridylmethyl)-sulfonamido)-4-methylphenolato (bpsmp(-)).
- Preparation of dinuclear and mononuclear complexes of Co(II), Mn(II), Cu(II), and V(IV)=O.
- Characterization of complexes using various analytical techniques (details not specified in abstract).
Main Results:
- Air-stable dinuclear complexes of Co(II), Mn(II), and Cu(II) were formed with auxiliary acetate ligands.
- Mononuclear complexes were obtained for Co(II) and Mn(II) in the absence of acetate.
- Acetate ligands were found to stabilize dinuclear structures for labile Co(II) and Mn(II) ions.
- A mononuclear V(IV)=O complex formed even with acetate, likely due to steric hindrance.
- Solvent-dependent formation of mononuclear Cu(II) complexes was observed, with phenol coordination varying.
- A dinuclear Cu(II) complex was isolated using two equivalents of the copper salt.
Conclusions:
- The sulfonamide donors in bpsmp(-) provide control over mono- versus dinuclear complex formation.
- Bridging acetate ligands are essential for stabilizing dinuclear structures with labile metal ions like Co(II) and Mn(II).
- Ligand design and reaction conditions significantly influence the nuclearity and structure of the resulting metal complexes.
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