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The nature of metal complexes of heterocyclic thiosemicarbazones reported in the literature through 1989 have been reviewed with an emphasis on variations in stoichiometry and stereochemistry. A brief introduction is followed by a survey of the biological activity of the uncomplexed thiosemicarbazones. Next is a section on the chemical nature of thiosemicarbazones including a discussion of preparative methods, modes of coordination and isomerism. This is followed by a discussion of structural information and biological activity of the iron(III), iron(II), copper(II), cobalt(III), cobalt(II) and nickel(II) complexes of heterocyclic thiosemicarbazones. Short sections on the biological activity of other chelating thiosemicarbazones and metal complexes are also included.

Structural and physical correlations in the biological properties of transition metal heterocyclic thiosemicarbazone and S -alkyldithiocarbazate complexes

Titanium oxide (TiO2 ) has been commonly used as an electron transport layer (ETL) of regular-structure perovskite solar cells (PSCs), and so far the reported PSC devices with power conversion efficiencies (PCEs) over 21% are mostly based on mesoporous structures containing an indispensable mesoporous TiO2 layer. However, a high temperature annealing (over 450 °C) treatment is mandatory, which is incompatible with low-cost fabrication and flexible devices. Herein, a facile one-step, low-temperature, nonhydrolytic approach to in situ synthesizing amino-functionalized TiO2 nanoparticles (abbreviated as NH2 -TiO2 NPs) is developed by chemical bonding of amino (-NH2 ) groups, via TiN bonds, onto the surface of TiO2 NPs. NH2 -TiO2 NPs are then incorporated as an efficient ETL in n-i-p planar heterojunction (PHJ) PSCs, affording PCE over 21%. Cs0.05 FA0.83 MA0.12 PbI2.55 Br0.45 (abbreviated as CsFAMA) PHJ PSC devices based on NH2 -TiO2 ETL exhibit the best PCE of 21.33%, which is significantly higher than that of the devices based on the pristine TiO2 ETL (19.82%) and is close to the record PCE for devices with similar structures and fabrication procedures. Besides, due to the passivation of the surface trap states of perovskite film, the hysteresis of current-voltage response is significantly suppressed, and the ambient stability of devices is improved upon amino functionalization.

Low-Temperature In Situ Amino Functionalization of TiO2 Nanoparticles Sharpens Electron Management Achieving over 21% Efficient Planar Perovskite Solar Cells.

As one of the most toxic heavy metals, mercury ion (Hg 2+ ) has become a concern focus for its severe threats to environment and human health. As a result, it is of great importance to develop novel methods to realize the recognition and quantification of Hg 2+ . The past decades witness the development of nanomaterial-based optical sensors for Hg 2+ detection, showing the benefits of simplicity, rapidity, high sensitivity and selectivity, and cost-effectiveness. The reported methods have allowed the detectability down to nanomolar concentrations or much lower levels, and proved their practical applications for detecting and quantifying Hg 2+ in synthetic solutions or natural water samples. In this review, we summarize the published innovations in nanomaterial-based optical sensors for the detection of Hg 2+ according to different sensing strategies, including colorimetric, fluorescent and surface enhanced Raman scattering detection. Moreover, some challenges and significant attempts related to these methods are also discussed.

http://ir.yic.ac.cn/bitstream/133337/17510/1/Nanomaterial-based%20optical%20sensors%20for%20mercury%20ions.pdf

Nanomaterial-based optical sensors for mercury ions

Facile synthesis of Cu(II) impregnated biochar with enhanced adsorption activity for the removal of doxycycline hydrochloride from water.

Synthesis and characterization of heterobinuclear (la-zn, pr-zn, nd-zn, sm-zn, eu-zn, gd-zn, tb-zn, dy-zn)azine-bridged complexes

Role of tannic acid in desiging of electrically active and magnetic gold nanoparticles and enhanced photovoltaic performance of gold@titania photoanode in DSSC

Complexes having the chemical compositions Fc(HL)2Cl2 [Hi. = 2-acetylthiophene-2-furoylhydrazone (Hatfh), 2-acetylfuran-2-furoylhydrazone (Haffh), 2-acetylpyridine-2-furoylhydrazone (Hapfh)]; Fe(Hhafh)Cl(H2O) [H2hafh - o-hydroxyacetophenonc-2-furoylhydrazone); [Fe(II2dapfh)Cl]Cl [H2dapfh 2, 6-diacetylpyridinc bis(2-furoylhydrazone)]; FeL2(H2O)n [HL = Hatfh, Haffh, n = 2; L = Hapfh. n = 0]; Fe(hafh)(H2O)3 and Fe(dapfh)(H2O) have been prepared and characterized. The electrical conductivity indicates a non-ionic nature of the complexes except [Fe(H2dapfh)Cl]Cl which is a 1:1 electrolyte in solution. Magnetic susceptibility, IR and electronic spectra of the complexes were employed to establish the stereochemistry and mode of bonding of the hydrazones. Mossbauer spectra indicate that iron is in the +2 oxidation state in these complexes.

Synthesis and characterization of iron(ii) complexes containing furoylhydrazone ligands

o-Hydroxyacetophenone-2-furoylhydrazone (H2hafh) C13H12O3N2 forms the complexes of the type K[Ln(hafh)2H2O] [Ln = La(III), Pr(III), Nd(III), Sm(III), Eu(III), Gd(III) and Dy(III)]. The complexes have been characterised by elemental analyses, molar conductance, magnetic susceptibility, infrared, electronic and proton n.m.r. spectral studies. The nephelauxetic ratio (β), covalency (δ) and bonding parameter (b1/2) have been calculated for Pr(III), Nd(III) and Sm(III) complexes. I.r. and n.m.r. spectral studies suggest that H2hafh behaves as dinegative tridentate ligand with the bonding sites being azomethine nitrogen, phenolate and enolate oxygens. A coordination number seven has been proposed around the metal ions in all the complexes.

Studies on Some Inner Transition Metal Complexes of o-Hydroxyacetophenone-2-Furoylhydrazone

Investigation of mesomorphic, photophysical and gelation behavior in aroylhydrazone based liquid crystals: Observation of mesophase crossover phenomena

Bachcha Singh

Papers

Synthesis and characterization of heterobinuclear (la-zn, pr-zn, nd-zn, sm-zn, eu-zn, gd-zn, tb-zn, dy-zn)azine-bridged complexes

Role of tannic acid in desiging of electrically active and magnetic gold nanoparticles and enhanced photovoltaic performance of gold@titania photoanode in DSSC

Synthesis and characterization of iron(ii) complexes containing furoylhydrazone ligands

Studies on Some Inner Transition Metal Complexes of o-Hydroxyacetophenone-2-Furoylhydrazone

Investigation of mesomorphic, photophysical and gelation behavior in aroylhydrazone based liquid crystals: Observation of mesophase crossover phenomena