Synthesis of N,N′-bis and N,N,N′,N′-tetra-[(3,5-di-substituted-1-pyrazolyl)methyl]para-phenylenediamines: new candidate ligands for metal complex wires

Synthesis and structural characterisation of tetrahedral zinc(II) and trigonal bipyramidal cadmium(II) complexes containing N′-cyclohexyl substituted N,N-bispyrazolyl ligand

“…Moreover, despite numerous reports on metal complexes with N-donor ligands [33,34], little is known regarding pyrazolyl-based late transition metal complexes as catalysts for methyl methacrylate polymerisation [35][36][37] compared with early transition metal complexes [38][39][40][41] because late transition metal complexes are generally more tolerant towards polar functional monomers (including MMA) due to their less-oxophilic nature. In contrast, the steric and electronic properties of pyrazolyl-based ligands can be fine-tuned by an appropriate choice of substitutions on the 2-N, 3-C, 4-C, and 5-C atoms of the pyrazole moiety [42][43][44][45], and have been employed in diverse potential applications [46][47][48][49][50]. In view of these promising features of pyrazolyl-based ligands, we focused on the synthesis, characterisation, and reactivity of various transition metal complexes with pyrazolyl-based ligands and their catalytic activities towards MMA polymerisation [18,51,52].…”

Synthesis, characterization, and MMA polymerization activity of tetrahedral Co (II) complex bearing N, N-bis(1-pyrazolyl)methyl ligand based on aniline moiety

“…In particular, pyrazoles, which are among the fundamental heterocycles, have been extensively used as N-donor ligands to metals since the first review of pyrazole-derived ligands in 1972 [32][33][34]. Pyrazoles and their derivatives are attractive ligands because their steric and electronic properties can be fine-tuned by the appropriate choice of substitutions on the 2-N, 3-C, 4-C, and 5-C atoms of pyrazole [35][36][37][38]. The range of pyrazoles enables optimization of the electrophilic properties of transition metal complexes of pyrazoles and their derivatives for use as catalysts for olefin polymerization.…”

Synthesis of new potential ligands for metal complex wires: 2-pyridinmethyl-{4-[(2-pyridinylmethylimino)-methyl]-benzylidene}amines

“…On the basis of our initial work for the synthesis of polydentate ligands, 14 the new simple bisbidentate ligands 3 and 5 were prepared on reaction of benzene-1,4-dicarbaldehyde 1 and Cpyridin-2-yl-methylamine 2 or 2-amino-4-methyl pyridine 4 (Scheme 2). By comparison with various bis-bidentate and bis-tridentate ligands for the synthesis of known bimetallic or polymetallic complexes in the literature, 17,18 we describe here bis-bidentate ligands, for which the synthesis is relatively easy.…”