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Two novel Cu(ii) complexes, [Cu2L2(μ1.1-N3)2] (1) and [Cu2L2(μ1.1-CH3COO−)2]·2H2O (2), have been synthesized using a tridentate NNO donor Schiff base ligand, 2-[(piperidin-2-ylmethylimino)-methyl]-phenol (HL) and azide or acetate as the co-ligand. Both the structures exhibit elongated (4 + 1) square pyramidal geometries and are centrosymmetric dimers, in which the metal centers are connected by the double μ1.1-azido and acetate bridges. Both complexes exhibit unconventional C–H…π(chelate) interaction along with conventional C–H…π(aryl) supramolecular interactions in the solid-state assembly. A detailed analysis of Hirshfeld surfaces and fingerprint plots elegantly quantifies the interactions within the crystal structures, revealing significant similarities and differences in the interactions experienced by the complexes. The intricate combinations of C–H…π(chelate) and C–H…π(aryl) interactions are fully described along with the computational studies. The binding energies associated with the noncovalent interactions observed in the crystal structures and the interplay between them have been calculated using theoretical DFT calculations. Moreover, the interactions have been characterized by using both Bader's theory of “atoms-in-molecules” and the noncovalent interaction plot (NCI plot). [ABSTRACT FROM AUTHOR]

Highlights: [•] X-ray crystal structures of four complexes proved the orientation of the ligands. [•] Only mononuclear bis- and tris-chelates complexes were obtained. [•] Tautomerization resulted keto-thiol form of the ligands for metal ion binding. [Copyright &y& Elsevier]

Enantiopure hydroxymethylated cycloalkenols bearing a quaternary stereocenter have been synthesized by a Pybox mediated enantioselective desymmetrization method. The synthesized cycloalkenols serve as starting precursors for the construction of several chiral small ring carbocyclic frameworks by a distinct functional group transformation. [ABSTRACT FROM AUTHOR]

The coordination cluster [Cu( μ-OMe)( μ-N)( μ-bcp)(N)] ( 1; Hbcp = 2,6- bis(2-benzoyl-4-chloro-phenylimino)-methyl)-4-methylphenol, forming a new member within the rapidly growing family of Cu cluster complexes, has been synthesized and structurally characterized by X-ray crystallography. The complex crystallizes in the monoclinic system, space group P2/ c, with unit cell parameters a = 14.620(7) Å, b = 17.923(8) Å, c = 15.008(7) Å, β = 115.815(14)° and Z = 2. It is the first example of a rhomboidal [Cu] compound formed from μ-azido clipping of two methoxido bridged [Cu] complexes showing asymmetric coordination from benzophenone oxygen atoms and terminal azido groups. [Figure not available: see fulltext.] [ABSTRACT FROM AUTHOR]

of o-tosylaminophenyl pyridine derivatives [ABSTRACT FROM AUTHOR]