No abstract

The title CuII macrocyclic complex salt tetrahydrate, [Cu(C22H46N6O2)](C2H3O2)2·4H2O, sees the metal atom located on a centre of inversion and coordinated within a 4 + 2 (N4O2) tetragonally distorted coordination geometry; the N atoms are derived from the macrocycle and the O atoms from weakly associated [3.2048 (15) Å] acetate anions. Further stability to the three-ion aggregate is provided by intramolecular amine-N—H...O(carboxylate) hydrogen bonds. Hydrogen bonding is also prominent in the molecular packing with amide-N—H...O(amide) interactions, leading to eight-membered {...HNCO}2 synthons, amide-N—H...O(water), water-O—H...O(carboxylate) and water-O—H...O(water) hydrogen bonds featuring within the three-dimensional architecture. The calculated Hirshfeld surfaces for the individual components of the asymmetric unit differentiate the water molecules owing to their distinctive supramolecular association. For each of the anion and cation, H...H contacts predominate (50.7 and 65.2%, respectively) followed by H...O/O...H contacts (44.5 and 29.9%, respectively).

Fourteen membered octamethyl tetraazamacrocyclic ligand salt, Me8[14]diene·2HClO4 and three isomeric ligands (LA, LB and LC) of its saturated analog have been synthesized as per literature. Interaction between the isomeric ligand LB and KX (X = SCN, NO3, Cl, Br and I) afforded white-coloured five coordinated square pyramidal potassium complexes [KLBX]. Moreover, the reaction between RbCl and LB produced five coordinated [RbLBCl] having square pyramidal geometry. Then, the axial substitution reaction on [RbLBCl] furnished a substituted rubidium complex with the same geometry of the mother complex. All the alkali metal complexes have been characterized by using modern analytical techniques. Furthermore, antibacterial and antifungal activities of ligand LB and its alkali metal (K and Rb) complexes have been investigated against different bacteria and fungi.