1-Phenyl-3-methyl-4-touloyl-5-pyrazolone (ligand) was synthesized and used to prepare an oxovanadium(IV) complex. The complex was characterized by single-crystal X-ray analysis and various spectroscopic techniques. The single-crystal X-ray analysis of the complex shows that the ligands are coordinated in a syn configuration to each other and create a distorted octahedral environment around the metal ion. A heterogeneous catalyst comprising an oxovanadium(IV) complex and hydrous zirconia was synthesized, characterized by various physicochemical techniques, and successfully used for the solvent-free oxidation of styrene. The influence of the reaction parameters (percent loading, molar ratio of the substrate to H(2)O(2), amount of catalyst, and reaction time) was studied. The catalyst was reused three times without any significant loss in the catalytic activity.
Novel C3 symmetric vanadium(iii) complexes of tripodal ligands of pyrazolones were synthesized and characterized by various spectroscopic and analytical techniques including single crystal XRD.
Two novel Rhodamine-pyrazolone-based colorimetric off-on fluorescent chemosensors for Fe(3+) ions were designed and synthesized using pyrazolone as the recognition moiety and Rhodamine 6G as the signalling moiety. The photophysical properties and Fe(3+) -binding properties of sensors L(1) and L(2) in acetonitrile-aqueous solution were also investigated. Both sensors successfully exhibit a remarkably 'turn-on' response, toward Fe(3+) , which was attributed to 1: 2 complex formation between Fe(3+) and L(1) /L(2) . The fluorescent and colorimetric response to Fe(3+) can be detected by the naked eye, which provides a facile method for the visual detection of Fe(3+) .
The title compound, C18H14Cl2N2O2, crystallizes with two molecules, A and B, in the asymmetric unit. In molecule A, the dihedral angles between the central pyrazole ring and pendant dichlorobenzene and p-tolyl rings are 2.18 (16) and 46.78 (16)°, respectively. In molecule B, the equivalent angles are 27.45 (16) and 40.45 (18)°, respectively. Each molecule features an intramolecular O—H⋯O hydrogen bond, which closes an S(6) ring and molecule A also features a C—H⋯O interaction. In the crystal, weak C—H⋯π interactions and aromatic π–π stacking [shortest centroid–centroid separation = 3.707 (2) Å] generate a three-dimensional network.
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