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Molecular and Supramolecular Structures of Cd(II) Complexes with Hydralazine-Based Ligands; A New Example for Cyclization of Hydrazonophthalazine to Triazolophthalazine
| Content Provider | MDPI |
|---|---|
| Author | Soliman, Saied Massoud, Raghdaa Al-Rasheed, Hessa El-Faham, Ayman |
| Copyright Year | 2021 |
| Description | 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 $CdCl_{2}$ gave the 1D coordination polymer $[Cd(H_{2}L)Cl_{3}]_{n}*H_{2}$O, 1, in which the Cd(II) ion is hexa-coordinated with one cationic monodentate ligand (H_{2}$L^{+}$) 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 (H_{2}$L^{+}$) 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 $[Cd(TPT)(SCN)_{2}]_{n}*H_{2}$O, 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 $HL^{OH}$ with $CdCl_{2}$ under reflux condition gave the trinuclear complex $[Cd_{3}(Hydralazine)_{2}(H_{2}O)_{2}Cl_{6}$], 3, indicating the hydrolysis of the hydrazonophthalazine ligand $HL^{OH}$ during the course of the reaction. Due to symmetry considerations, there are only two different Cd(II) centers having $CdN_{2}Cl_{3}$O and $CdN_{2}Cl_{4}$ coordination environments. Hirshfeld topology analysis was used to analyze the solid-state supramolecular structure of the studied complexes. |
| Starting Page | 823 |
| e-ISSN | 20734352 |
| DOI | 10.3390/cryst11070823 |
| Journal | Crystals |
| Issue Number | 7 |
| Volume Number | 11 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2021-07-15 |
| Access Restriction | Open |
| Subject Keyword | Crystals Inorganic Chemistry Cd(ii) Hydrazonophthalazine Triazolophthalazine Hirshfeld Tautomerism Cationic Ligand |
| Content Type | Text |
| Resource Type | Article |
