Abstract
Molecular and supramolecular structures of two polymeric and one trinuclear Cd(II) complex with hydralazine-type ligands were presented. Self-assembly of E-1-(2-(thiophen-2-ylmethylene)hydrazinyl)phthalazine (HL) and CdCl2 gave the 1D coordination polymer [Cd(H2L)Cl3]n*H2O, 1, in which the Cd(II) ion is hexa-coordinated with one cationic monodentate ligand (H2L+) and five chloride ions, two of them acting as connectors between Cd(II) centers, leading to the formation of a 1D coordination polymer along the a-direction. Using DFT calculations, the cationic ligand (H2L+) could be described as a protonated HL with an extra proton at the hydrazone moiety. Repeating the same reaction by heating under reflux conditions in the presence of 1 mL saturated aqueous KSCN solution, the ligand HL underwent cyclization to the corresponding [1,2,4]triazolo[3,4-a]phthalazine-3(2H)-thione (TPT) followed by the formation of [Cd(TPT)(SCN)2]n*H2O, 2, a 1D coordination polymer. In this complex, the Cd(II) is coordinated with one NS-donor TPT bidentate chelate and two bridged μ(1,3)-thiocyanate ions connecting the Cd(II) centers forming the 1D polymer array along the b-direction. Heating E-2-(1-(2-(phthalazin-1-yl)hydrazono)ethyl)phenol HLOH with CdCl2 under reflux condition gave the trinuclear complex [Cd3(Hydralazine)2(H2O)2Cl6], 3, indicating the hydrolysis of the hydrazonophthalazine ligand HLOH during the course of the reaction. Due to symmetry considerations, there are only two different Cd(II) centers having CdN2Cl3O and CdN2Cl4 coordination environments. Hirshfeld topology analysis was used to analyze the solid-state supramolecular structure of the studied complexes.
Highlights
Phthalazine derivatives have been the subject of substantial studies in recent years due to their interesting medicinal applications as efficient anti-inflammatory [1,2], antimicrobial [3–10], anticonvulsant [11], and anticancer agents [12–14]
We presented the reactions of two new hydrazonophthalazine ligands with cadmium chloride as shown in Scheme 1
The molecular and supramolecular structures of the resulting one-dimensional coordination polymers 1 and 2 and the trinuclear complex 3 were elucidated with the aid of single crystal X-ray diffraction combined with Hirshfeld calculations
Summary
Phthalazine derivatives have been the subject of substantial studies in recent years due to their interesting medicinal applications as efficient anti-inflammatory [1,2], antimicrobial [3–10], anticonvulsant [11], and anticancer agents [12–14]. Schiff bases derived from hydralazine have considerable importance in the discipline of coordination chemistry as they are regarded as strong electron donor ligands able to coordinate metal ion through their N-chelating sites. The denticity of the ligand could could be improved by adding substituents having donor atoms, such as nitrogen, oxyg or sulphur [15]. In this regard, binuclear metal (II) complexes with phthalazine type l ands were found to have interesting magnetic interactions and were used as go examples of metalloenzymes and in catalysis applications [22]. Schiff bases d rived from hydralazine could act as a good receptor for the transition meta2lso,f 2c2ausing markable color change, and could be used as chemosensors [23,24]
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