Four-coordinate nickel(II) and copper(II) complex based ONO tridentate Schiff base ligands: Synthesis, molecular structure, electrochemical, linear and nonlinear properties, and computational study
Dalton Transactions, ISSN: 1477-9234, Vol: 44, Issue: 41, Page: 18019-18037
2015
- 71Citations
- 54Captures
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Metrics Details
- Citations71
- Citation Indexes71
- 71
- CrossRef62
- Captures54
- Readers54
- 54
Article Description
We report the synthesis, characterization, crystal structures, nonlinear-optical (NLO) properties, and density functional theory (DFT) calculations of nickel(ii) and copper(ii) complex based ONO tridentate Schiff base ligands: two mononuclear compounds, [Ni(An-ONO)(NCH)] (5) and [Cu(An-ONO)(4-NCHC(CH))] (6), and two heterobimetallic species, [M(Fc-ONO)(NCH)] (M = Ni, 7; Cu, 8), where An-ONOH (3) and Fc-ONOH (4) are the 1:1 condensation products of 2-aminophenol and p-anisoylacetone and ferrocenoylacetone, respectively. These compounds were characterised by microanalysis, FT-IR and X-ray crystallography in the solid state and in solution by UV-vis and H and C NMR spectroscopy. The crystal structures of 3-5, 7 and 8 have been determined and show for Schiff base complexes 5, 7 and 8 a four-coordinated square-planar environment for nickel and copper ions. The electrochemical behavior of all derivatives 3-8 was investigated by cyclic voltammetry in dichloromethane, and discussed on the basis of DFT-computed electronic structures of the neutral and oxidized forms of the compounds. The second-order NLO responses of 3-8 have been determined by harmonic light scattering measurements using a 10 M solution of dichloromethane and working with a 1.91 μm incident wavelength, giving rather high β values of 350 and 290 × 10 esu for the mononuclear species 5 and 6, respectively. The assignment and the nature of the electronic transitions observed in the UV-vis spectra were analyzed using time-dependent (TD) DFT calculations. They are dominated by LMCT, MLCT and π-π∗ transitions.
Bibliographic Details
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=84944254197&origin=inward; http://dx.doi.org/10.1039/c5dt02822a; http://www.ncbi.nlm.nih.gov/pubmed/26412689; http://xlink.rsc.org/?DOI=C5DT02822A; http://pubs.rsc.org/en/content/articlepdf/2015/DT/C5DT02822A; https://xlink.rsc.org/?DOI=C5DT02822A; https://dx.doi.org/10.1039/c5dt02822a; https://pubs.rsc.org/en/content/articlelanding/2015/dt/c5dt02822a
Royal Society of Chemistry (RSC)
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