Formation of a water-mediated assembly of two neutral copper(ii) Schiff base fragments with a Cu2(NCS)4moiety: exploration of non-covalent C–H⋯π(bimetallo ring) interactions

The energetic features of dimer formation and water encapsulation in an interesting copper(ii) Schiff base complex, [(CuL)₂⊂(H₂O)][Cu₂(μ_1,3-NCS)₂(NCS)₂], have been studied using DFT calculations.

Pb⋯X (X = N, S, I) tetrel bonding interactions in Pb(ii) complexes: X-ray characterization, Hirshfeld surfaces and DFT calculations

We report the synthesis and X-ray characterization of four new Pb(ii) complexes of nicotinoylhydrazone and picolinoylhydrazone-based ligands and three different anionic co-ligands (acetate, thiocyanate and iodide) exhibiting relevant tetrel bonding interactions.

Influence of ancillary ligands on preferential geometry and biomimetic catalytic activity in manganese(III)-catecholate systems: A combined experimental and theoretical study

The present report describes the synthesis and structural characterizations of six new manganese(III) complexes with redox-active tetrachlorocatecholate ligand in the presence of different ancillary ligands (pyridines and imidazole). X-ray crystal structure analysis reveals that the geometry of manganese(III) centres in 1 and 2 is essentially square pyramidal, while it is discrete octahedron in compounds 3-6. These preferential structural diversities in these systems have been critically analysed by theoretical calculations. Remarkably, the characterization of both π⋯π stacking interactions and MnMn bonds in the supramolecular dimeric aggregates in the solid state in 1 and 2 by means of the Bader's theory of "atoms in molecules" (AIM) is quite interesting as that nicely corroborates the experimental fact. All the complexes are active toward the phenoxazinone synthase like activity and the detailed kinetic analysis was performed to get better insight into their catalytic efficiency. Electrochemical property of these complexes as well as different donor property of the ancillary ligands clearly establish that the ease of reduction of the metal centre i.e., the catalytic ability is favoured when the metal centre is bonded to the electron deficient pyridyl systems. EPR spectroscopy and theoretical study are further helpful to get insight into origin of the catalytic activity in these compounds. The present report overall highlights that tuning of the geometry and catalytic activity of manganese(III) complexes with tetrachlorocatecholate ligand can be attained by the introduction of different substitutions in ancillary pyridine ligands.

Isolation of Azadiphosphiridines and Diphosphenimines by Cycloaddition of Azides and a Cationic Diphosphene

The polarized, cationic diphosphene [(^Cl Im^Dipp )P=P(Dipp)]⁺ as the triflate salt 7[OTf](^Cl Im^Dipp =4,5-dichloro-1,3-bis(Dipp)-imidazol-2-yl; Dipp=2,6-diisopropylphenyl) reacts with azides of type RN₃ (R=Dipp or Dmp; Dmp=2,5-dimethylphenyl) in a [2+3] cycloaddition reaction followed by the release of N₂ and a subsequent electrocyclic ring-closing reaction to azadiphosphiridine salts [(^Cl Im^Dipp )P-P(Dipp)-N(R)]10a,b[OTf] (R=Dipp or Dmp). The reaction of 7[X] (X=OTf, GaCl₄ ) with the electron-rich azides Me₃ SiN₃ and NaN₃ give the unusual diphosphenimine derivatives [(^Cl Im^Dipp )P-P(Dipp)=N(SiMe₃ )]⁺ (11[OTf]) and [(^Cl Im^Dipp )P-P(Dipp)=N(GaCl₃ )] (12), respectively, featuring an acyclic P₂ N moiety. Theoretical calculations provide insights into the reaction mechanisms to the cyclic and acyclic forms, in which the thermodynamic stability of the latter prevents the electrocyclic ring closure.