Journal of Advanced Chemical Engineering

Novel Ligands for Surface Functionalization of CdSe Nanocrystals: Synthesis and Applications

Coudane Iram^* Department of Bio-Chemical Engineering, The University of Western Australia, Crawley, Australia
^*Correspondence: Coudane Iram, Department of Bio-Chemical Engineering, The University of Western Australia, Crawley, Australia, Email:

Received: 03-Apr-2023, Manuscript No. ACE-23-21251; Editor assigned: 06-Apr-2023, Pre QC No. ACE-23-21251 (PQ); Reviewed: 20-Apr-2023, QC No. ACE-23-21251; Revised: 27-Apr-2023, Manuscript No. ACE-23-21251 (R); Published: 05-May-2023, DOI: 10.35248/2090-4568.23.13.281

Description

The alkyl or aryl derivatives of carbodithioic acids (RC(S)SH) are presented as a new family of ligands for surface functionalization of Cadmium and Selenium (CdSe) nanocrystals. The following are the primary benefits of these novel ligands: They nearly quantitatively exchange the initial surface ligands Tri Octyl Phosphine Oxide (TOPO) in very mild conditions; they significantly improve the photooxidation resistance of nanocrystals due to their ability of strong chelate-type binding to metal atoms; and their relatively simple preparation via Grignard intermediates facilitates the development of new bifunctional ligands containing, in addition to the anchoring carbodithioate group, a second function that enables the graftin.

For the first time, we report the grafting of an electroactive oligomer from the polyaniline family aniline tetrameron CdSe nanocrystals after their functionalization with 4- formyldithiobenzoic acid. Grafting occurs via a condensation process between the ligand's aldehyde group and the tetramer's terminal primary amine group. The fluorescence of its ingredients is completely extinguished in the resulting organic/ inorganic hybrid, showing efficient charge or energy transfer between the organic and inorganic semiconductors.

Catalytic ethylene oligomerization is a topic of contemporary academic and industrial interest, particularly for the manufacture of linear -olefins in the C4-C10 range, which are in high demand. Identifying and fine-tuning the parameters that govern metal catalyst activity and selectivity are key difficulties at the junction of ligand design, coordination/organometallic chemistry, and homogeneous catalysis. In this context, we show how comparative research aimed at altering the coordinating capabilities of functional ligands for a metal used in industrial processes, such as nickel, result in beneficial impacts in catalytic ethylene oligomerization.

Blau initially published the production of 2,2'-bipyridine (bpy) and detailed the first transition metal compound of this key ligand exactly 100 years ago. Since then, bpy and its related ligand l,lO-phenanthroline (phen) have been employed in both analytical and preparative coordination chemistry. However, thorough studies of substituted derivatives of bpy and other cl^- diiminc ligands have just lately been done. Much of this research has been motivated by the current high level of interest in the redox and photocatalytic characteristics of the Ru (bpy) ⁺ cation.

Although substituents in the pyridine rings can dramatically alter the physical and chemical properties of complexes containing bpy ligands, replacing one or both of the pyridine rings with other nitrogen-containing heterocycles can result in even larger alterations. The significantly varied electrical characteristics of the several nitrogen heterocycles explain such shifts.

Structure activity relationships for organometallic RuII complexes of the type [(6-arene) Ru(XY)Cl] are reported. XY=N,N-(diamine), N,O-(e.g., amino acidate), or O,O-(e.g., - diketonate) chelating ligand, arene=benzene derivatives to fused polycyclic hydrocarbons, and Z=PF6. 13 complexes' X-ray structures are reported. All have the distinctive "piano-stool" shape. XY=ethylene diamine (en) and extended polycyclic arenes were found in the complexes that were most active against A2780 human ovarian cancer cells. Complexes with polar substituents on the arene or XY=bipyridyl derivatives had lower activity. The activity of the O,O-chelated complexes was largely dependent on the substituents and the arene. Complexes of arene=p-cymene and XY=amino acidate were inactive. Complexes were not cross- resistant to cisplatin, and Adriamycin cross-resistance was avoided.

A series of dicationic bis-chelated palladium(II) complexes [Pd(N- N)2][X]2 (N-N=2,2'-bipyridine (bipy), 1,10-phenanthroline (phen), and their substituted derivatives; X=PF6-, BF4-, OTf-, OTs-) have been synthesised and well characterized in solution and solid state. A simple one-pot reaction between Pd(MeCOO)² and [(N-N)H][X] is used in the synthesis approach. These compounds are extremely active precatalysts for CO/styrene copolymerization, resulting in precisely alternating polyketones. The crystal structures of various complexes in the series show that the ideal square planar geometry is distorted towards a twist conformation. One of the two nitrogen-donor ligands is involved in a dissociative equilibrium in Dimethyl Sulfoxide (DMSO) solution, giving a monochelated complex with two cis coordination sites available for the copolymerization catalytic process.