Recent developments in penta-, hexa- and heptadentate Schiff base ligands and their metal complexes

Structural, spectroscopic, electrochemical and antibacterial studies of some new nickel(II) Schiff base complexes

Experimental and theoretical studies of (Z)-N-(2-chlorobenzylidene) naphthalen-1-amine and (Z)-N-(3-nitrobenzylidene)naphthalen-1-amine, and their corrosion inhibition properties

Synthesis, spectroscopic and single crystal X-ray studies on three new mononuclear Ni(II) pincer type complexes: DFT calculations and their antimicrobial activities

A diquinone–imidazole ensemble (R) is rationally designed, synthesized and employed as a selective and sensitive colorimetric sensor for cyanide ions in DMSO : H2O (1 : 4 v/v). 1H NMR titration indicates that the mechanism of sensing involves the formation of a H-bond between CN− and imidazole N–H. As rationalized, the R–CN− complex exhibited intense NIR-absorption (913 nm; log e 4.3) with a 428 nm red-shift from the absorbance maximum of free R. DFT calculations indicate that the R–CN− complex is perfectly planar with a HOMO–LUMO energy gap of 0.9826 eV which is optimal for NIR-absorption.

A diquinone–imidazole ensemble for selective colorimetric sensing of cyanide in aqueous medium via anion induced NIR absorption

One-pot synthesis and structural characterization of a Tb(III) coordination polymer based on a tripodal Schiff base ligand adopting an exo-bridging coordination mode

The electronic structure of a water-soluble near-infrared (NIR)-absorbing complex was determined to be singlet diradical [PtII(LISQ)2]2– [(LISQ)2–· = o-diiminosulfobenzosemiquinonate radical] by X-ray diffraction and 1H NMR spectroscopy. Cyclic voltammetry (CV) showed redox reactions of [PtII(LISQ)2]2– to give [PtII(LISQ)(LIBQ)]– (E1 = –0.26 V vs. Fc+/Fc) and [PtII(LISQ)(LPDI)]3– (E2 = –1.46 V) [(LIBQ)– = o-diiminosulfobenzoquinonate, (LPDI)3– = o-phenylenediiminesulfonate]. The monoradical structure of the latter was confirmed by electron paramagnetic resonance (EPR) spectroscopy. Splitting of the reduction wave of [PtII(LISQ)(LIBQ)]– in CV and the weak EPR signal suggested the formation of a dimer. Because the rest potential of the solution exceeds Epa1 at pH 4.0, the decrease in the NIR absorption at pH < 4.0 can be attributed to the oxidation of [PtII(LISQ)2]2– followed by dimerization.

Atsuko Masuya

Papers

One-pot synthesis and structural characterization of a Tb(III) coordination polymer based on a tripodal Schiff base ligand adopting an exo-bridging coordination mode

pH-Responsive Switching of the Near-Infrared Absorption of the Water-Soluble Bis(o-diiminobenzosemiquinonato)platinum(II) Complex

A molecular probe for recognizing the size of hydrophobic cavities based on near-infrared absorbing diradical–PtII complexes

pH-responsive switching of near-infrared absorption of a diradical complex of PtII and 3,4-diaminobenzoate formed in aqueous solutions