Moganavelli Singh, Peter A. Ajibade, Abimbola E. Oluwalana, Berlinda M. Sikakane, and Athandwe M. Paca
Subjects
Crystallography, Elemental analysis, Chemistry, Materials Chemistry, Crystal structure, Physical and Theoretical Chemistry, 010402 general chemistry, 010403 inorganic & nuclear chemistry, 01 natural sciences, Single crystal, In vitro, 0104 chemical sciences
Abstract
Bis(dibenzyldithiocarbamato)Zn(II), [Zn(dbzdtc)2], was synthesized and characterized by spectroscopic techniques, elemental analysis and single crystal X-ray crystallography. The compound is crysta... more...
Berlinda M. Sikakane, Bernard Omondi, Peter A. Ajibade, Abimbola E. Oluwalana, and Nandipha L. Botha
Subjects
chemistry.chemical_classification, 010405 organic chemistry, Chemistry, Organic Chemistry, chemistry.chemical_element, Nanoparticle, Crystal structure, engineering.material, 010402 general chemistry, Digenite, 01 natural sciences, Copper, 0104 chemical sciences, Analytical Chemistry, Coordination complex, Inorganic Chemistry, Polymer chemistry, engineering, Dithiocarbamate, High-resolution transmission electron microscopy, Single crystal, Spectroscopy
Abstract
We report the synthesis and crystal structures of bis(dibenzyl dithiocarbamato) copper(II) and silver(I) complexes and their use as precursors to prepare Cu1.8S and Ag2S nanoparticles. Single crystal analysis of bis(dibenzyl dithiocarbamato)Cu(II) complex consist of a monomeric entity where the two dibenzyl dithiocarbamate ligands form a distorted square planar geometry around the Cu(II) ion. The bis(dibenzyl dithiocarbamato)Ag(I) formed hexameric coordination complex consisting of two distorted hexagonal Ag3S3 rings. The complexes were thermolysed at 220 °C to prepare copper sulphide and silver sulphide nanoparticles. Powder X-ray diffraction (p-XRD) patterns of the copper sulphide nanoparticles were indexed to digenite Cu1.8S, while silver sulphide nanoparticles were confirmed to be acathinite Ag2S. High-resolution transmission electron microscopy (HRTEM) images showed Ag2S nanoparticles with particle size in the range 11.4–27.4 nm while Cu1.8S nanoparticles are semi-spherical in shape with slightly agglomerated particles in the range 6.9–24.0 nm. The as-prepared nanoparticles were used as nano-photocatalysts for the degradation of methylene blue dye (MB) under UV light irradiation with degradation efficiency of 42.52% and 48.39% for Cu1.8S and Ag2S nanoparticles respectively. more...
Abimbola E. Oluwalana, Moganavelli Singh, Peter A. Ajibade, and Berlinda M. Sikakane
Subjects
Materials science, General Physics and Astronomy, Nanoparticle, 02 engineering and technology, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, 0104 chemical sciences, chemistry.chemical_compound, chemistry, Phase (matter), Photocatalysis, Physical and Theoretical Chemistry, 0210 nano-technology, High-resolution transmission electron microscopy, Photocatalytic degradation, Cytotoxicity, Methylene blue, Nuclear chemistry, Wurtzite crystal structure
Abstract
We report the synthesis, photocatalytic and cytotoxic studies of hexadecylamine capped zinc sulphide (ZnS) nanoparticles. XRD patterns confirmed hexagonal wurtzite phase of ZnS nanoparticles and HRTEM micrograph revealed spherically shaped particles with sizes in the range 2.81-4.48 nm. Energy band gaps of 4.67, 4.68 and 4.71 eV for ZnS1, ZnS2 and ZnS3 obtained at 30 min, 1 h and 2h. The photocatalytic degradation of methylene blue by the as-synthesized ZnS nanoparticles showed degradation efficiency of 55.16% for ZnS1, 53.58% for ZnS2 and 71.17% ZnS3 after 3 hours. Anticancer studies of the ZnS nanoparticles showed they exhibited very potent cytotoxicity activity against breast adenocarcinoma and human cervical carcinoma cancer cell lines. more...