Solvothermal syntheses and crystal structures of two 4‐heterocyclic acylpyrazolone complexes

Abstract

, Z = 2. Complex 1 has a two-dimensional (2D) network structure that is formed by O-H···N H-bonding interactions. Complex 2 makes a one-dimensional (1D) zigzag chain structure by intermolecular π···π interactions, which is further interlinked via C-H···N Hbonding interactions to generate a 2D sheet, and then a three-dimensional (3D) supramolecular network structure is further linked by intermolecular C-H···π interactions.

Synthesis, Structural Characterization and Antimicrobial Activity of a Novel Cobalt(II) Complex Based on 3-Methyl-1-Phenyl-4-(2-Thienoyl)-Pyrazol-5-One

“…The comparative infrared spectra of the ligand and the complex 1•2H 2 O are given in Figure 1. The spectra present a number of important bands which can be easily assigned to different functional groups, OH vibration (at 3600 cm −1 ), N-H (at 3100 cm −1 ), the intermolecular N-H---O (at 2600 cm −1 ), C = O, C = C, C = N and N-N (at 1624 -1407 cm −1 ) as reveal in previous works using 4-acetylbispyrazolone [3] [35] [36] or 1-phenyl-3-methylpyrazol-5-one [23] [37] [38] and their complexes.…”

“…The C(12)-C(13) and C( 14)-C(15) bond lengths are 1.375(2) Å and 1.371(3) Å, respectively, shorter than the C(12)-C(13) and C( 14)-C(15) bond lengths in the free ligand. These changes indicate that during coordination delocalized pyrazolone-ring has averaged the bond length [23] [37] [40]. The C(1)-N(1) bond length is close to the C-N double bond length, confirming that the keto form of the ligand isomerizes to the enol form.…”

“…Metal complexes with the oxygen-cobalt bond are used in oxidation processes [20]. Because it can adopt different modes of coordination depending on whether the ligand is N-or O-donor, Co(II) is an excellent option for the production of metal-organic compounds with magnetic or luminous characteristics [21] [22] [23]. Cobalt is a transition element that is essential for life.…”