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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.

A novel homologous series of N-[4-[4′-n-alkoxy)benzoyloxy-2-hydroxybenzylidene)-4-carbethoxy anilines, H2n+1CnOC6H4C(O)OC6H3(OH)C(H)˭NC6H4COOC2H5 (n = 6, 8, 10, 12, 14, 16) and their copper(II) complexes have been synthesized. All these compounds have been characterized by suitable spectroscopic techniques. The mesomorphic properties of these compounds were investigated by differential scanning calorimetry (DSC) and polarizing optical microscopy (POM). The ligands exhibit wide range of enantiotropic smectic A and nematic phases as confirmed by their typical optical texture under polarizing microscope. The square planar copper(II) complexes of the ligands show only an isotropic phase at higher temperature and no mesogenic nature is observed. DFT calculations have been performed using GAUSSIAN-03 program at B3LYP level to obtain the stable electronic structure of the ligand with decyloxy chain length and its copper(II) complex.

Synthesis, characterization, and mesomorphic investigations of diester-substituted salicylaldimines and their copper (II) complexes

Two types of [M(Hapfh)2Cl]Cl2 and [M(apfh)2OH] complexes; Hapfh=2-acetylpyridine-2-furoylhydrazone [M=LaIII, PrIII, NdIII, EuIII or DyIII], possessing the neutral and deprotonated ligand respectively, have been prepared and characterised by elemental analysis, molar conductance, magnetic susceptibility measurements, electronic, i.r. and n.m.r. (1H and13C) spectral studies. The nephelauxetic ratio (\(\bar \beta \)), covalency (δ) and bonding parameter (b1/2) have been calculated for the NdIII complexes. I.r. spectral studies reveal that Hapfh acts as a neutral tridentate in [M(Hapfh)2Cl]Cl2 and uninegative tridentate in [M(apfh)2OH]. A coordination number of seven around the metal ions is proposed.

Synthesis and structural studies on trivalent lanthanide 2-acetylpyridine-2-furoylhydrazone complexes

New homologous series of N-(4-n-alkoxy-2-hydroxybenzylidene)-4-carbethoxyaniline, H2n + 1CnOC6H3(OH)C(H) = NC6H4COOC2H5 (n = 6, 8, 10, 12, 16) have been synthesized. These compounds were reacted with copper acetate to get the metal complexes. All these compounds have been characterized by elemental analysis, FT-IR and NMR spectroscopy. Mesomorphic properties of these compounds were studied by differential scanning calorimeter and polarizing microscope. These compounds exhibit wide range enantiotropic SmA phase as confirmed by their typical optical texture under polarizing microscope. In the heating cycle, all the members of the series (hexyl to hexadecyl) show SmA phase in the range of 70 to 115°C and this range is almost independent of the alkoxy chain (except in decyl). All the members show supercooling effect and the range of SmA phase is increased in the cooling cycle in comparison to the corresponding heating cycle. The copper (II) complexes of the series also show enantiotropic SmA phase but at high...

Synthesis, Characterization and Mesomorphic Properties of n-(4-n-Alkoxy-2-Hydroxybenzylidene)-4-Carbethoxyaniline and their Copper Complexes

Three series of ester linkage containing aroylhydrazone based compounds have been synthesised where density and length of alkoxy chains are varied sequentially at ester end, keeping amide end of th...

Effect of alkoxy chain density on the mesogenic properties of aroylhydrazone based liquid crystals: synthesis, characterisation, photophysical and gelation behaviour

In this article, we report synthesis and characterization of a novel homologous series of butyl 4-(4′-(alkoxy)-2-hydroxybenzylideneamino)benzoates, CnLH (n = 6, 8, 10, 12, 14, 16) and their...

Bachcha Singh

Papers

Synthesis, characterization, and mesomorphic investigations of diester-substituted salicylaldimines and their copper (II) complexes

Synthesis and structural studies on trivalent lanthanide 2-acetylpyridine-2-furoylhydrazone complexes

Synthesis, Characterization and Mesomorphic Properties of n-(4-n-Alkoxy-2-Hydroxybenzylidene)-4-Carbethoxyaniline and their Copper Complexes

Effect of alkoxy chain density on the mesogenic properties of aroylhydrazone based liquid crystals: synthesis, characterisation, photophysical and gelation behaviour

Mesomorphic and DFT studies of terminal ester containing salicylaldimines and their copper (II) complexes