An article Slow magnetic relaxation in penta-coordinate cobalt(II) field-induced single-ion magnets (SIMs) with easy-axis magnetic anisotropy WOS:000563083800029 published article about STATE PERTURBATION-THEORY; MOLECULE MAGNET; ZERO-FIELD; DONOR LIGANDS; NI-II; COMPLEXES; VALENCE; COPPER(II); EFFICIENT; BEHAVIOR in [Massoud, Salah S.; Perez, Zoe E.; Courson, Jessica R.] Univ Louisiana Lafayette, Dept Chem, POB 94370, Lafayette, LA 70504 USA; [Massoud, Salah S.] Alexandria Univ, Fac Sci, Dept Chem, Alexandria, Egypt; [Fischer, Roland C.] Graz Univ Technol, Inst Anorgan Chem, A-8010 Graz, Austria; [Mautner, Franz A.] Graz Univ Technol, Inst Phys & Theoret Chem, A-8010 Graz, Austria; [Vanco, Jan; Cajan, Michal; Travnicek, Zdenek] Palacky Univ Olomouc, Reg Ctr Adv Technol & Mat, Div Biol Act Complexes & Mol Magnets, Slechtitelu 27, CZ-78371 Olomouc, Czech Republic in 2020.0, Cited 99.0. Category: pyrazoles-derivatives. The Name is 3,5-Dimethyl-1H-pyrazole. Through research, I have a further understanding and discovery of 67-51-6
Two penta-coordinate complexes of the general formula [Co(L-n)(NCS)]ClO4, where L-1= {bis[(3,5-dimethyl-1H-pyrazol-1-yl)ethyl]-[(3,4-dimethoxypyridin-2-yl)methyl]}amine and L-2= {bis[(3,5-dimethyl-1H-pyrazol-1-yl)ethyl]-[(4-methoxy-3,5-dimethylpyridin-2-yl)methyl]}amine, have been synthesized and thoroughly characterized. Each of the cobalt(ii) atoms is penta-coordinated in the {CoN5} donor set with a distorted square-pyramidal geometry in [Co(L-1)(NCS)]ClO4 center dot MeOH (1), while the vicinity of the central atom can be described as a distorted trigonal-bipyramidal geometry in [Co(L-2)(NCS)]ClO4(2) as revealed using the SHAPE analysis. Differences in interatomic parameters among the cobalt(ii) and donor atoms in 1 and 2 have definite impact on the magnetic features of both compounds. The complexes show an easy-axis magnetic anisotropy (D = -38.5 cm(-1) for 1 and D= -8.5 for 2), and both complexes reveal a large rhombicity with E/D = 0.21 for 1 and E/D = 0.29 for 2. The ZFS parameters (g, D and E) were also calculated using CASSCF/NEVPT2 methods and they are in good agreement with those determined from experimental data. A frequency dependent out-of-phase susceptibility has been observed in external magnetic field (B-dc= 0.1 T) revealing the following parameters of slow relaxation of magnetization for 1: energy of the spin reversal barrier, U-eff = 16.0 cm(-1)(U-eff/kB = 23.0 K) and the relaxation time, tau(0)= 1.28 x 10(-6)s. In the case of complex 2, no maxima of frequency dependent out-of-phase susceptibility have been observed and thus, the value of U-eff= 17 cm(-1) has been estimated using the expression U-eff = vertical bar D vertical bar x (S-2- 1/4). It has been demonstrated that the degree of substitution and the type of substituents on the pyridyl moieties of the tripodal ligands (L-1 and L-2) used in these penta-coordinate cobalt(ii) complexes have significant impact on structural and magnetic features.
About 3,5-Dimethyl-1H-pyrazole, If you have any questions, you can contact Massoud, SS; Perez, ZE; Courson, JR; Fischer, RC; Mautner, FA; Vanco, J; Cajan, M; Travnicek, Z or concate me.. Category: pyrazoles-derivatives
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