The central Ni(II) cation is found in a six-coordinate octahedral geometry formed by the tridentate Schiff base ligand PLITSC and three water molecules. These ligands and complexes 1–3 have significant antimicrobial and antioxidant properties.Ībstract The title complex triaqua (3-hydroxy-5-hydroxymethyl-2-methylpyridine-4-carboxaldehyde-3-methylisothiosemicarbazone-k3,O3,N7,N10)Ni(II) nitrate ((NO3)2, 1) represents the second transition metal complex incorporating an isothiosemicarbazide-pyridoxal based Schiff base that has been crystallographically characterized. Supportive DFT calculations on the complexes have been carried out. Thermal behavior has been investigated to study the framework stabilities of these structures. The morphology and structures of the complexes are further examined by SEM. The crystal structures reveal that each molybdenum site in the binuclear complexes adopts a distorted octahedral geometry. The cavities formed by hydrogen bonding interactions are capable of hosting guest molecules. In all the complexes (1–3), 4,40-azpy behaves as an auxiliary spacer and bridges the Mo(VI) centers giving rise to neutral 3D supramolecular frameworks. These complexes have been characterized by spectroscopic and electrochemical studies. Three new isostructural pillared binuclear dioxomolybdenum(VI) complexes (1), (2) and (3) containing tridentate binegative Schiff base ligands (H2L1, H2L2 and H2元) obtained by the condensation of salicylaldehyde and substituted salicylaldehyde with S-benzyl dithiocarbazate have been reported for the first time. Crystal structures, DFT calculation and supramolecular architectures via hydrogen bonding and π-π stacking interactions are discussed. DFT calculations on the ligand and complexes 2, 2a, 9 and 10 were also carried out.Linear diimine and diamine-bridged binuclear dioxomolybdenum(VI) complexes with ONS donor ligands have been synthesized. In addition, extensive hydrogen bonding interactions in complex 10 lead to the formation of cavities. Complexes 2, 2a, 9 and 10 give rise to interesting supramolecular architectures via hydrogen bonding and π-π stacking interactions. The complexes 2, 2a, 9 and 10 were structurally characterized by single crystal X-ray crystallography which reveal that in these complexes the overall coordination geometry around the Mo(VI) center can be described as distorted octahedral. Elemental analysis, various spectroscopic (IR, UV–Vis, 1H NMR) measurements and electrochemical studies have been used for characterization of these complexes.
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DFT calculations were used to study the electronic properties of the complexes.Ī series of linear diimine and diamine-bridged binuclear dioxomolybdenum(VI) complexes having general formula with the tridentate binegative Schiff base ligands obtained by the condensation of salicylaldehyde/2-hydroxyacetophenone with S-benzyl/S-methyl dithiocarbazate have been synthesized. The complexes were further characterized by elemental analysis, spectroscopic methods (IR, 1 H NMR and UV–vis), electrochemical study and thermogravimetric analysis. Complexes 1 and 2 give rise to 3D metal-organic supramolecular frameworks having rectangular cavities formed via hydrogen bonding and p-p stacking interactions. The two complexes have similar centrosymmetric dimeric structures in which each molybdenum atom occupies distorted octahedral six-coordinate environments being bonded to a dianionic tridentate ONS donor ligand via phenolate oxygen, imine nitrogen and thioenolate structure as well as two terminal oxygen atoms and a nitrogen atom of the bridging 4,4 0-azpy ligand. Crystal and molecular structures of the investigated binuclear complexes 1 and 2 were determined by single crystal X-ray diffraction. Simply click the "Reload" button and all will be well with the world.Two new pillared binuclear dioxomolybdenum(VI) complexes (1) and (2) have been synthesized by the reaction of MoO 2 (acac) 2 with Schiff base ligands (H 2 L 1 and H 2 L 2) derived from 2-hydroxyacetophenone and S-benzyl/S-methyl dithiocarbazates respectively and 4,4 0-azopyridine as a spacer. You do not have to restart your web browser or your computer after you enable JavaScript. Open your browser preferences, and enable JavaScript. You need to turn JavaScript on in order to control this web page. Video Tutorials Learn about CrystalMaker in these detailed audio-visual tutorials