Synthesis, structural characterization and thermal properties of three copper(II) complexes based on aryl hydrazide ligands

Abstract

The thiosemicarbazide and hydrazide Cu(II) complexes, [Cu 3 L 2 1 (py) 4 Cl 2 ] (1), [Cu(HL 2 )py] (2) and [Cu(HL 3 )py] (3), (H 2 L 1 = 1-picolinoylthiosemicarbazide, H 3 L 2 = N 0 -(2-hydroxybenzylidene)-3-hydroxy-2-naphthohydrazide, H 3 L 3 = 2-hydroxy-N 0 -((2-hydroxy-naphthalen-1-yl)methylene)benzohydrazide) have been prepared and characterized through physicochemical and spectroscopic methods as well as X-ray crystallography. Complex 1 has a centrosymmetric structure with -N-N-bridged Cu 3 skeleton. Neighboring molecules are linked into a 3D supermolecular framework by p-p stacking interactions, N-HÁÁÁCl and C-HÁÁÁCl hydrogen bonds. Complexes 2 and 3 have similar planar structures but different dimers formed by concomitant CuÁÁÁN and CuÁÁÁO interactions, respectively. Solvent accessible voids with a volume of 391 Å 3 are included in the structure of complex 2, indicating that this complex is a potential host candidate. Thermogravimetric analysis shows that the three complexes are stable up to 100°C.

Synthesis, characterization and thermal behavior of copper(II) complexes with pyridoxal thiosemi (PLTSC)- and S-methylisothiosemicarbazone (PLITSC)

“…Unlike these, the spectrum of 3 contains five bands in the range characteristic for SO 4 2-group: three around 1000 cm -1 and two around 600 cm -1 , which supports the bridging role of sulfate ion [27]. Despite general similarity visualized in these figures, coordination geometry shows fine, but significant differences.…”

“…IR spectra of 1, 2, 2a and 4 possess one sharp band at 1114, 1112, 1057 and 1118 cm -1 , respectively, and other at 618, 616, 607 and 620 cm -1 , respectively, which correspond to uncoordinated SO 4 2-group [27]. Unlike these, the spectrum of 3 contains five bands in the range characteristic for SO 4 2-group: three around 1000 cm -1 and two around 600 cm -1 , which supports the bridging role of sulfate ion [27].…”

“…The thermal analysis of compounds with potential biological activity is a common part in their characterization [3,4] as offers valuable, sometimes essential data to develop new pharmaceutical forms [5] or to detect structural changes or polymorphism [6] in materials used in drug formulation or in their quality control [7]. In addition, with increasing sensitivity of thermal equipments by means of thermal methods, important structural details could be determined [8] that are sometimes difficult to obtain by other techniques.…”

[N′-(4-Decyloxy-2-oxidobenzylidene)-3-hydroxy-2-naphthohydrazidato-κ3N,O,O′]dimethyltin(IV): crystal structure and Hirshfeld surface analysis

“…In addition, the catalytic properties of vanadium (Hosseini-Monfared et al, 2010, cerium (Jiao et al, 2014) and palladium complexes (Arumugam et al, 2015) have been explored. Further, structural data for copper (Liu et al, 2012), molybdenum (Miao, 2012) and vanadium (Kurup et al, 2010) complexes are available. As part of our ongoing work with these ONO tridentate ligands (Lee et al, ISSN 2056-9890 2013), we hereby describe the crystal and molecular structures of the title compound, (I), as well as a detailed analysis of the intermolecular associations through a Hirshfeld surface analysis.…”

Synthesis and structural characterization of N‐methylanthraniloyl‐ (4‐ethylthiosemicarbazide) and its Cu(II) trinuclear complex

“…[3] The presence of additional donor atom(s) X in the acyl moiety enables bridging mode of the corresponding acyl thiosemicarbazides by the coordination with metal ions through both donor sets (O, N 2 ) and (X, S, N 1 ) (figure 1d). [4][5][6][7][8] In such cases, the obtained complexes are oligonuclear systems with complicated topologies. Herein, the present work reports the synthesis and structure determination of a new acyl thiosemicarbazide ligand H2L (figure 2) derived from Nmethylanthranilic acid.…”