Synthesis and characterization of lithium, aluminium and zinc complexes supported by pyrazolyl-based N,N′-chelate ligands

2009 ◽  
Vol 33 (3) ◽  
pp. 659-667 ◽  
Author(s):  
Can Jin ◽  
Zhong-Xia Wang
Keyword(s):  
Zinc Complexes ◽  
Synthesis And Characterization ◽  
Lithium Aluminium ◽  
Chelate Ligands

Synthesis and characterization of copper, manganese and zinc complexes of the bidentate diisocyano ligands 2,5-dimethyl 2,5-diisocyanohexane (TMB) and 1,2-diisocyanoethane(DHB)

Polyhedron ◽  
1989 ◽  
Vol 8 (3) ◽  
pp. 317-323 ◽  
Author(s):  
Michèle Dartiguenave ◽  
Yves Dartiguenave ◽  
André Guitard ◽  
Alain Mari ◽  
André L. Beauchamp
Keyword(s):  
Zinc Complexes ◽  
Synthesis And Characterization ◽  
Copper Manganese

Synthesis and Characterization of Thiol-Derivatized Porphyrins and Metalloporphyrin complexes

1997 ◽  
Vol 01 (02) ◽  
pp. 189-200 ◽  
Author(s):  
HONGPING YUAN ◽  
L. KEITH WOO
Keyword(s):  
Zinc Complexes ◽  
Synthesis And Characterization ◽  
Porphyrin Ring ◽  
Amide Linkage

A series of thiol-derivatized porphyrins and the corresponding cobalt and zinc complexes were synthesized from 5-(p-aminophenyl)-10,15,20-triphenylporphyrin ( H 2 TPP - NH 2), and 5α,15α-bis(o-aminophenyl)porphyrin ( H 2 DPE - ( NH 2)2). These derivatized porphyrins have a different number of thiol appendages attached via amide linkages at different locations. The thiol-derivatized porphyrins made from H 2 TPP - NH 2, H 2 TPP - NHC ( O )( CH 2) n SH ( n = 2, 4, 5, 10), have one alkyl-thiol appendage attached to the porphyrin through an amide linkage on the p-aminophenyl position. The derivatives made from H 2 DPE -( NH 2)2 have two alkyl-thiol appendages attached to the porphyrin through amide linkages on the o-aminophenyl positions on the same face of the porphyrin ring. These thiol-derivatized porphyrins are important adsorbates for the preparation of thiol–porphyrin monolayers on gold.

scholarly journals Synthesis and Characterization of Silicon and Germanium Nanocrystals and Titanium Disulphide Nanostructures

2021 ◽  
Author(s):  
◽  
Sujay Prabakar
Keyword(s):  
High Temperature ◽  
Room Temperature ◽  
Size Control ◽  
Synthesis And Characterization ◽  
One Pot ◽  
Lithium Aluminium ◽  
Germanium Nanocrystals ◽  
Fluorescent Whitening Agents ◽  
Silicon And Germanium

<p>This thesis is concerned with the synthesis and characterization of nanostructured materials in the solution, in particular silicon and germanium nanocrystals, their applica-tion as fluorescent whitening agents and titanium disulphide nanostructures. The aim of this research with regards to the synthesis of silicon and germanium nanocrystals was to obtain size control and provide functionality using simple room temperature solution techniques. In the case of the nanostructures of titanium disulphide, the focus was to synthesize in the colloid using simple one-pot bench top techniques. The above were realized with chemical techniques in the solution using organic solvents and surfactants to control their size. The morphology, chemical composition and crystal structure of the synthesized nanomaterials were characterized using techniques such as High Resolution Transmission Electron Microscopy (HRTEM), Selected Area Electron Diffraction (SAED), Scanning Electron Microscopy (SEM), Energy Dispersive X-Ray Spectrosco-py (EDX) and Optical Spectroscopies. Whilst chapter one is a brief introduction of the thesis, chapter two talks in detail about the various characterization techniques used in this research.  Chapter three of the thesis focuses on the synthesis of alkyl- and amine-functionalized silicon nanocrystals using a microemlusion technique. The effect of reducing agents, surfactants and precursors on particle size was studied. The surfactant C12E5 was found to be very effective in producing silicon nanocrystals that were freestanding and pure. Whilst the hydride reducing agents lithium aluminium hydride and lithium tri-ethyl borohydride were found to be effective in synthesizing nanocrystals of narrow size distribution, it was found that using silicon tetrachloride yielded smaller particles compared to silicon tetrabromide.  The fourth chapter in the theses is concerned with the synthesis and characterization of germanium nanocrystals by both microemulsion and high temperature techniques. Using lithium aluminium hydride; a strong reducing agent, very small nanocrystals were obtained, whilst weaker reductants such as sodium borohydride produced larger nano-crystals. Another effective method to control the particle size of germanium nanocrystals was found to be by varying the concentration of precursor. The germanium nanocrystals which were amine capped were found to luminesce in the blue and were used to image HePG2 cells. Toxicity studies on these nanocrystals proved their relative non-toxicity. The high temperature experiments, though not as flexible as the room temperature syntheses were found to facilitate a certain degree of size control.  Chapter five of the theses deal with the application of silicon and germanium nanocrys-tals as fluorescent whitening agents in wool fabrics. Both nanocrystals, when applied to the fabric were found to emit matching blue fluorescence that was demonstrated to be more suited to improving the brightness properties of fabric than the commercial fluo-rescing whitening agent Uvitex. In particular Silicon-amine and Silicon-hexene functionalized nanocrystal (low concentration) treated fabrics were found to have improved color stability against both UVA and UVB radiation. The treated fabrics were in addition found to maintain a stable color than untreated fabric. Silicon-amine treated fabrics were found to have a stable color even after 48h exposures to UVA radiation. It should be noted that this is the first evidence of the application of group IV semiconductor nanocrystals as fluorescing whitening agents.  The sixth chapter of this thesis deals with the one-pot synthesis of titanium disulphide nanostructures using both coordinating and non-coordinating solvents and their subse-quent characterization. By varying the injection temperature of the titanium source into the 1-Octadecene sulphur solution, two different morphologies were synthesized. Two different pathways were suggested for the formation of the flower-like and flake-like morphologies; an instant nucleation to form titanium disulphide flakes whilst spherical nuclei to form flower-like nanostructures. The flower-like nanostructures were found to have higher BET surface area compared to the flake-like nanostructures and previously reported surface areas for analogous TiS₂ nanostructures. Whilst using oleylamine as solvent, the low temperature injection yielded hollow spheres of TiS₂ and the high temperature injection, fullerene-like nanoparticles of TiS₂. The property of oleylamine to selectively bind to the nanostructure surface in conjunction with the effect of injection temperature was understood to be behind the growth of these nanostructures. The synthesis of flower-like and flake-like morphologies by solution phase techniques were the first evidence of this kind for titanium disulphide and provides a new and exciting material for a variety of applications.  A final chapter on conclusions and recommendations for future work is then presented.</p>

Synthesis and characterization of a new family of binuclear chelate ligands and their copper(II) complexes

1985 ◽  
Vol 96 (1) ◽  
pp. 87-90 ◽  
Author(s):  
Naohide Matsumoto ◽  
Miaki Asakawa ◽  
Hidenori Nogami ◽  
Akira Ohyoshi
Keyword(s):  
Synthesis And Characterization ◽  
New Family ◽  
Chelate Ligands
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