Mohammad Shakir

Bio: Mohammad Shakir is an academic researcher from Aligarh Muslim University. The author has contributed to research in topics: Octahedral molecular geometry & Schiff base. The author has an hindex of 28, co-authored 123 publications receiving 2094 citations.

Synthesis of samarium-doped zinc oxide nanoparticles with improved photocatalytic performance and recyclability under visible light irradiation

Abstract: Samarium-doped ZnO nanoparticles (1%, 3%, and 5%) were synthesized by a gel-combustion route and their application as an efficient photocatalyst for the degradation of Malachite green (MG) dye is demonstrated. These nanoparticles were characterized by spectroscopic techniques (UV-vis and photoluminescence), micrograph techniques (SEM and TEM), X-ray diffraction, and energy dispersive X-ray, in order to evaluate their optical and structural properties, particle size distribution, and morphology. The UV-vis spectroscopic studies indicated that Sm doping increased the visible light absorption ability of the Sm-doped ZnO nanoparticles and a redshift for the Sm-doped ZnO nanoparticles appeared when compared to ZnO nanoparticles. An enhancement in the optical absorption of the Sm-doped ZnO nanoparticles indicated that it can be used as an efficient photocatalyst under a visible light irradiation. The effect of tert-butyl alcohol and disodium salt of ethylenediaminetetraacetic acid as the scavengers in the photocatalysis process revealed that hydroxyl radicals (˙OH) and holes (h+) were the reactive species responsible for the degradation of MG. The degradation mechanism has been proposed for the degradation of MG dye under the visible light irradiation. The recyclability of the Sm-doped ZnO nanoparticles for the MG dye degradation is also demonstrated.

Antitumour metal compounds: more than theme and variations

Abstract: Triggered by the resounding success of cisplatin, the past decades have seen tremendous efforts to produce clinically beneficial analogues. The recent achievement of oxaliplatin for the treatment of colon cancer should, however, not belie the imbalance between a plethora of investigated complexes and a very small number of clinically approved platinum drugs. Strategies opening up new avenues are increasingly being sought using complexes of metals other than platinum such as ruthenium or gallium. Based on the chemical differences between these metals, the spectrum of molecular mechanisms of action and potential indications can be broadened substantially. Other approaches focus on complexes with tumour-targeting properties, thereby maximizing the impact on cancer cells and minimizing the problem of adverse side effects, and complexes with biologically active ligands.

International Tables for X-Ray Crystallography

Abstract: International Tables for X-Ray Crystallography (Published for the International Union of Crystallography.) Vol. 1: Symmetry Groups. Edited by Norman F. M. Henry and Kathleen Lonsdale. Pp. xi + 558. (Birmingham: Kynoch Press, 1952.) 105s.