The interaction between carboplatin anticancer drug and B12N12 nano-cluster: A computational investigation

This study investigated the interaction between B12N12 nano-cluster and carboplatin complex using B3P86 functional. Two interaction modes between B12N12 nano-cluster and carboplatin complex were considered. The bonding interaction between the B12N12 nano-cluster and carboplatin complex was examined through energy decomposition analysis (EDA). Also, Shubin Liu’s energy decomposition analysis (EDA-SBL) is used to study the source of energy differences between various isomers of B12N12 ...  carboplatin complex. Charge transfer between fragments were illustrated with electrophilicity-based charge transfer (ECT) and extended charge decomposition analysis (ECDA). The quantum theory of atoms in molecules (QTAIM) analysis was applied to assess the Pt-B and Pt-N bonds within B12N12 ...  carboplatin complex.

Reactivity of mono- and divalent aluminium compounds towards group 15 nanoparticles

Herein, we present a novel approach towards organometallic group 13/15-compounds, i.e. the reaction of nanoparticular arsenic and antimony with low-valent aluminium species. The reaction of the two-electron reducing agent [AlCp*]₄ (Cp* = C₅Me₅) with arsenic nanoparticles gave rise to a mixture of two unprecedented deca- and dodecanuclear Al-As clusters. In contrast, the analogous transformation with nanoparticular antimony yielded the already known Al-Sb compound [(AlCp*)₃Sb₂]. Additionally, two different dialanes [AlCp*X]₂ (X = Br, I) were employed as one-electron reducing agents, forming calix like coordination compounds upon reaction with nano arsenic. The isolated species significantly enlarge the accessible structural variety of molecular group 13/15 compounds, highlighting the exceptional utility and reactivity of nanoscale group 15 precursors.

Theoretical investigation of the nature of π(BB)⋯M interactions in coinage metal π-diborene complexes

π(BB)⋯M interactions are strong covalent bonds and their strengths increase in the sequence of M = Ag, Cu, and Au, for the same number of MCl. Theoretical investigation on the nature of π(BB)⋯M interactions in coinage metal π-diborene complexes is outlined here.

Dialumination of unsaturated species with a reactive bis(cyclopentadienyl) dialane

A new cyclopentadienyl-containing dialane is prepared and found to undergo dialumination reactions with unsaturated species.

Stability and donor-acceptor bond in dinuclear organometallics CpM1-M2Cl3 (M1, M2 = B, Al, Ga, In; Cp = η 5-C5H5)

The geometries and stabilities of the dinuclear organometallics CpM₁-M₂Cl₃ (M₁, M₂ = B, Al, Ga, In; Cp = η ⁵-C₅H₅) have been investigated by density functional theory (DFT) at M06 L/6-311G(d, p) levels. The nature of the donor-acceptor M₁ → M₂ bond was also studied based on the atoms in molecules (AIM) theory, energy decomposition analysis (EDA) and natural bond orbital (NBO) analysis. The results show that the electronegativity of the M atom determines the stability and covalent character of the dinuclear organometallics CpM₁-M₂Cl₃. The compounds in which the M with larger electronegativity acts as the donor are more stable than in those in which it acts as the acceptor in the donor-acceptor bond, and the donor-acceptor bond has more covalent characteristics. The strength and polarity of the M₁ → M₂ donor-acceptor bond is determined by the periodicity of the M atom. When the period number of the M₁ atom is smaller than that of M₂, the strength of the M₁ → M₂ bond is larger than that of the M₂ → M₁ bond. For homonuclear dinuclear organometallics, the polarity of the M-M bond increases with increasing atomic number of the M atom. For heteronuclear complexes, the polarity of the M₁-M₂ bond for a given M₁ also increases in the sequence of M₂ = B, Al, Ga, and In. Graphic abstract Molecular graph and electron location function isosurfaces map of CpM 1 -M 2 Cl 3(small red spheres represent bond critical points).

The Role of Ligand Steric Bulk in New Monovalent Aluminum Compounds

The tetrameric Al(I) cyclopentadienyl compound Al₄Cp*₄ (Cp* = C₅Me₅) is a prototypical low-valence Al compound, with delocalized bonding between four Al(I) atoms and η⁵ ligands bound to the cluster exterior. The synthesis of new [AlR]₄ (R = C₅Me₄Pr, C₅Me₄iPr) tetramers is presented. Though these systems failed to crystallize, comparison of variable-temperature ²⁷Al NMR data with density functional theory (DFT) calculations indicate that these are Al₄R₄ tetramers analogous to Al₄Cp*₄ but with increased ligand steric bulk. NMR, DFT, and Atoms in Molecules analyses show that these clusters are enthalpically more stable as tetramers than the Cp* variant, due in part to noncovalent interactions across the bulkier ligand groups. Thermochemistry calculations for the low-valence metal interactions were found to be extremely sensitive to the DFT methodology used; the M06-2X functional with a cc-pVTZ basis set is shown to provide very accurate values for the enthalpy of tetramerization and ²⁷Al NMR shifts. This computational method is then used to predict geometrical structures, noncovalent ligand interactions, and monomer/tetramer equilibrium in solution for a series of Al(I) cyclopentadienyl compounds of varying steric bulk.