The accuracy and reliability of 17
commonly used density functionals
in conjunction with Poisson–Boltzmann finite solvation model
were gauged for predicting the free energy of Rh(I)- and Rh(III)-mediated
chemical transformations such as ligand exchange, hydride elimination,
dihydrogen elimination, chloride affinity, and silyl hydride bond
activation reactions. In total, six Rh-mediated reactions were examined,
and the computed density functional theory results were then subjected
to comparison with the experimentally reported values. For reaction
A, involving replacement of N2 with η2-H2 over Rh(I), MPWB1K-D3, B3PW91, B3LYP, and BHandHYLP
emerged to be the best functionals of all the tested methods in terms
of their deviations ≤2 kcal mol–1 from experimental
data. For reaction B, in which exchange of η2-C2H4 with N2 over Rh(I) takes place, MPWB1K-D3
and M06-2X-D3 functionals performed the best, while as for reaction
C (hydride elimination reaction in Rh(III) complex), it is PBE functional
that showed impressive performance. Similarly, for reaction D (H2 elimination reaction in Rh(III) complex), PBE0-D3 and PBE-D3
showed exceptional results compared to other functionals. For reaction
E (H2O/Cl– exchange), the PBE0 again
shows impressive performance as compared to other functionals. For
reaction F (Si–H activation), M06-2X-D3, PBE0-D3, and MPWB1K-D3
functionals are undoubtedly the best functionals. Overall, PBE0-D3
and MPWB1K-D3 functionals were impressive in all cases with lowest
mean unsigned errors (3.2 and 3.4 kcal mol–1, respectively)
with respect to experimental Gibbs free energies. Thus, these two
functionals are recommended for studying Rh-mediated chemical transformations.
The current investigation
was aimed at in vivo MAOA inhibitory activity
of coumarins angelicin, bergapten, and scopoletin isolated from the
roots of Angelica archangelica. The
isolated compounds were screened for MAOA (pdb ID 2Z5y) binding through
molecular docking studies. The molecular docking results displayed
that bergapten has a maximum affinity for MAOA, followed
by angelicin and scopoletin. In silico prediction
of physicochemical parameters indicated that maximum blood–brain
barrier (BBB) permeability was observed with angelicin (2.3), followed
by bergapten (2.0) and least with scopoletin (0.644). In consonance
to the results of molecular docking studies, appreciable in
vivo antidepressant activity of angelicin and bergaptan was
observed over the mouse model of reserpine-induced depression. The
modulation of MAOA in the antidepressant effect of extract
and its isolated fractions was also determined. Biochemical examination
of the brain tissue indicated that bergapten has maximum MAOA inhibitory activity while scopoletin fails to inhibit brain MAOA.
Bio-inspired Mo and W based catalysts have been designed for catalytic conversion of CO2 to HCOOH or vice versa by stepwise assessment of the chemical environment around the metal center using state-of-the-art density functional theory.
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