256445-23-5Relevant academic research and scientific papers
Enantiomers and Structural Isomers of Sodium and Palladium Complexes Bearing ortho-Bis(3,5-dimethylpyrazolylmethyl)phenolate: Fluxional Property and Highly Active Catalysts for Norbornene Polymerization
Jana, Oishi,Mani, Ganesan
, p. 7735 - 7747 (2018/07/10)
2,6-Bis(3,5-dimethylpyrazoylmethyl)-4-methylphenol LH was readily synthesized by the reaction between 2,6-bis[(dimethylamino)methyl]-4-methylphenol and 3,5-dimethylpyrazole. The X-ray structure of the trisodium complex of LH showed the benzene-like planar
Synthesis, structure, catalytic and magnetic properties of a pyrazole based five coordinated di-nuclear cobalt(II) complex
Alam, Rabiul,Pal, Kaberi,Shaw, Bikash Kumar,Dolai, Malay,Pal, Nabanita,Saha, Shyamal Kumar,Ali, Mahammad
, p. 84 - 91 (2016/01/26)
The reaction of 4-methyl-2,6-bis(3,5-dimethyl-1H-pyrazol-1-yl)methyl)phenol and Co(NO3)2·6H2O in MeCN gives rise to [Co2(L)2(N3)2] (1), a dinuclear five coordinated complex of Co(II), in satisfactory yield. The complex has been characterized by C, H and N microanalyses, FT-IR and UV-Vis spectral measurements. A single crystal X-ray diffraction study of 1 reveals that each Co(II) atom is in a distorted square-pyramidal geometry. Electrochemical studies in CH3CN showed that the Co(II)-Co(III)/Co(III)-Co(III) redox couple appears to be quasi-reversible (E1/2 = 0.409 V), while the corresponding Co(II)-Co(III)/Co(II)-Co(II) couple is mostly irreversible (E1/2 = -0.447 V). This complex displays modest catalytic activity toward the oxidation of various allylic compounds using TBHP as an oxidant in MeCN under mild conditions. A radical trapped experiment carried out in the presence of 4-tert-butylphenol clearly reveals that the epoxidation reactions occur purely through a radical pathway rather than a concerted one. Low temperature magnetic studies showed that the present Co(II) dimeric complex possesses a high positive magnetic anisotropy (D = +29.8 cm-1) and a weak ferromagnetic exchange interaction (2J = +10.3 cm-1).
Synthesis, magnetism, 1H NMR and redox activity of dicopper(II) complexes having a discrete {Cu2(μ-phenoxide)2}2+ unit supported by a non-macrocyclic ligand environment. Crystal structure of [Cu2(L)2(OCIO3)2] [HL = 4-methyl-2,6-bis(pyrazol-1-ylmethyl)-phenol]
Gupta, Rajeev,Mukherjee, Sumitra,Mukherjee, Rabindranath
, p. 4025 - 4030 (2007/10/03)
Reaction between 4-methyl-2,6-bis(pyrazol-l-ylmethyl)phenol (HL) or its 3,5-dimethylpyrazole derivative (HL′) and Cu(ClO4)2·6H2O afforded [CuII2(L/L′)2(OClO3) 2] 1 and 2. Complex 1 has been structurally characterized showing that each copper(II) centre is square pyramidal with two bridging phenoxide oxygens and two terminal pyrazole nitrogens in the equatorial plane and a perchlorate oxygen atom axially co-ordinated. Variable-temperature magnetic susceptibility measurements revealed that the dicopper(II) centres are strongly antiferromagnetically coupled [singlet-triplet energy separation, 2J (in cm-1): -1204 for 1 and -798 for 2]. The complexes exhibit 1H NMR spectra within δ 0-10 due to their S = 0 ground state. In MeCN solution they exhibit ligand field transitions in the range 14 300-16 600 cm-1 and phenolate-to-copper(II) charge-transfer transition at ≈22 700 cm-1. In MeCN solution each complex displays three consecutive irreversible responses (scan rate of 50 mV s-1) with Epc values (V vs. SCE) at -0.02, -0.54 and -0.86 (1) and 0.00, -0.42 and -0.80 (2). The first two responses are due to CuIICuI and the most cathodic response to CuI-Cu0 redox processes, respectively. The Royal Society of Chemistry 1999.
