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Updated: May 10, 2025

Synthesis of Wavelength-shifting DNA Hybridization Probes by Using Photostable Cyanine Dyes
Published on: July 6, 2016
Synthesis, physicochemical, XRD/HSA-interactions, heteromeric [CH···Cl/CH···πPh] synthon, DFT, thermal and 1BNA-DNA
Ahmed Boshaala1, Nawaf Al-Maharik2, Hisham Qrareya3
1Libyan Authority for Scientific Research, Tripoli, Libya. ahmedboshaala@yahoo.co.uk.
Abstract:
The reaction of bidentate-S, N-thione Schiff base ligand, Phenyl (E)-2-(1-phenylethylidene)-hydrazine-1-carbodithioate (PPEHCDT) with NiCl2.3H2O produced a neutral NiII(S, N)2 complex with cis form as kinetic favor isomer. Various physicochemical techniques, including EDX, FAB-MS, UV-Vis, IR, CHN, and XRD-crystal analysis, were employed to characterize the desired complex. These techniques provided evidence supporting the coordination of the ligand with the Ni-center, as indicated by the neutral cis-Ni(L)2 formula. The XRD-results revealed a cis-isomer as anionic S-thiol and bis-bidentate-N-azomethine, as well as a slightly distorted square planar neutral cis-Ni(PPEHCDT)2 complex. In contrast, the DFT simulation supported a distorted tetrahedral as favor geometry, despite the fact that the XRD/DFT structural parameters results agreed. Moreover, the Molecular Electrostatic Potential (MEP) together with the Hirshfeld Surface Analysis (HSA) confirmed the XRD seen in appearance of the Heteromeric sub-synthons via C-H….πPh and C-H···S interactions. Moreover, the TG/DTG technique exhibited a high level of stability (∼ 250 °C) and a two-step thermal degradation process for the prepared cis-Ni(PPEHCDT)2 complex. Furthermore, it has been observed that the molecular docking of 1BNA-DNA with the free ligand is superior to that of the cis-Ni(PPEHCDT)2 complex due to the presence of two H-bonds with a larger binding energy as opposed to a single H-bond with a lower binding energy.
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