Aminopyridine stabilized group-IV metal complexes and their applications

Abstract

During the last two decades, group-IV metalsbased aminopyridinato complexes have attracted a tremendous research interest because of immense industrial needs for the catalyst which would be of higher activity and selectivity with lower toxicity and lower cost. Chemistry of titanium (Ti) and zirconium (Zr) complexes was more extensively explored as compared to hafnium (Hf) complexes. Direct synthesis, salt metathesis, amine elimination, alkane elimination, silyl chloride elimination, hydrogen chloride elimination and toluene elimination protocols have been used for the synthesis of group-IV metal complexes. Changes in ligand and complex design were made to optimize these catalysts for olefin polymerization. Most of these complexes have shown good catalytic activities when activated with dry methyl aluminoxane. Ligand transfer to aluminum was found in these complexes, particularly with less bulky ligands, and this ligand transfer problem was overcome by tridentate ligands but the activities of these complexes were not competitive to complexes with bidentate aminopyridinato ligands. Majority of these complexes produce high-molecularweight polymers with broader molecular weight distributions, and Hf-complexes produce longer chain polymers than their comparative Ti and Zr aminopyridinato complexes. It could be deduced that group-IV metals inherit the potential for optimal polymerizing catalysts probably, because of their almost vacant d-orbitals, these act as hard acids which on combination with soft bases carry the opportunity to design and develop polymerization catalysts which could overcome the problems associated with existing systems.

Synthesis, Crystal Structure, and Analysis of Hirshfeld Surface of Hexa (4‐Aminopyridine) Triscopper(II) Carbonate Trihydrate

“…[33][34][35] Transition metals are important tools and are analyzed to develop molecule drug development interactions. [36][37][38] Due to their great affinity with electrons, reactivity, and shape, transition metals are employed to generate medications that are effective against cancer. [39,40] Organic-metal coordination crystals have attracted attention in material science due to their versatile applications in luminescence, magnetism, and catalysis.…”

Synthesis, Characterization, and Biological Evaluation of a New Hydrogen-Bonded Charge-Transfer Complex of 2-Amino-4-methoxy-6-methylpyrimidine

“…Moreover, some aminopyrimidine derivatives have been explored as antithrombus, antimicrobial, antifungal, and anti-HIV agents [19][20][21]. ey also form a range of organometallic complexes with anticancer and antioxidant activities [22][23][24]. Aminopyrimidines contain important groups that can act as electron donors or proton acceptors, and the study of their CT complexes helps to understand the nature of their CT interactions [25,26].…”