Ligand dynamics in tetracoordinate copper(I) complexes of bis(pyrazolyl)pyridine ligands †

[2,6-Bis(3,5-dimethylpyrazol-1-ylmethyl-κN2)pyridine-κN]bis(thiocyanato-N)copper(II)

“…The spectroscopic and chemical properties of copper compounds of pyrazole and its derivatives have been studied intensively during the last two decades (Sheu et al, 1995;Martens et al, 1995;Kitajima et al, 1992;Sorrell et al, 1991) because of their ease of handling and manipulation in making model compounds for biological systems such as hñmocyanin and tyrosinase (Solomon et al, 1992). To give more insight into the coordination behaviour of pyrazole-based ligands with copper(I) and copper(II) ions, a systematic study has been embarked on in our group (Manikandan et al, 1996(Manikandan et al, , 1998 of the ligand 2,6-bis(3,5-dimethylpyrazol-1-ylmethyl)pyridine, L, containing one pyridine and two pyrazole donors. We report herein the crystal structure of (I), a monomeric copper(II) complex with the ligand L and two thiocyanate counter-ions.…”

Phosphorescent Cu(i) complexes based on bis(pyrazol-1-yl-methyl)-pyridine derivatives for organic light-emitting diodes

“…[20][21][22][23][24][25][26] Cu(I) complexes of a tripodal ligand 2,6-bis(1-pyrazole)pyridine were ever prepared for ligand dynamic studies. 27,28 Recently much attention has been paid to the alternative architecture bearing one diimine or analogues plus an ancillary bis-phosphine chelate, generally leading to compounds with greatly enhanced emission performance imposed by the highly rigid chelate and stronger metal-phosphine bonding. [29][30][31][32][33][34][35][36][37][38][39][40][41][42][43] For example, a high external quantum efficiency (EQE) of 16% was achieved with heteroleptic Cu(I) complexes containing phenanthroline and triphenylphosphine as the ligands.…”

Bis(Pyrazolyl)Pyridine Late Transition Metal Complexes as Single-Site Catalysts for Ethylene Polymerization to Highly Linear Polyethylene

“…In comparison, five-member metallocycles complexes (in the absence of methylene linker) show lower bite angle (73°) [36] than that of six-member metallocycles complexes. This explains the increase of molecular flexibility and reduction of the metal-ligand planarity of the sixmember metallocycles in comparison to the five-member metallocycles complexes [32,40]. In addition, the angle at the two pyrazolyl nitrogens with the central metal (N-M-N) of our complexes became smaller upon coordination (102-125°), calculated from the optimized geometry Fig.…”