Two chemosensors with varying substitution
have been synthesized
for selective detection of d10 metal ion analyte Zn2+ and Cd2+ by fluorometric method from aqueous
medium at very low limit of detection. Density functional theory (DFT)-based Loewdin spin population analysis reveals that methoxy-substituted
chemosensor is much stronger donor than bromo-substituted chemosensor.
Eventually, bromo and methoxy substituted chemosensors are moderate
and strong donor, respectively, toward selective detection of Cd2+ and Zn2+ by luminescence induced phenomenon (blue
for Cd2+ and cyan for Zn2+). The mechanism of
sensing could be explained by PET-CHEF-C = N isomerization-ILCT pathway. 1H NMR, ESI-MS and FT-IR has been carried out in order to explore
the selective ion sensing mechanism. Intracellular detection of Zn2+ and Cd2+ has been carried out inside androecium
(filament and pollens) of Tecoma Stans. Extracellular
detection of Zn2+ for yeast cells represents the bio mimetic
model experiments toward β-cells exocytosis as a marker of diabetes mellitus. The unprecedented and novel feature of
the present biocompatible chemosensor is its application as biosensor
to detect in vivo Zn2+ from human urine
specimen which could be a next generation diagnostic tool for Pick’s disease.
A novel chelator probe with flexible structural configuration has been synthesized as chemosensor for selective detection of biotic anion like OAc− by chromogenic as well as fluorogenic signal. The nitro substituted chelator probe has shown pale yellow to deep yellow coloration upon detection of OAc− ion. Significantly the emission of the chelator probe upon recognition of the anion has been turned ON in low energy region which has been explained through PET‐ESIPT‐ILCT‐C=N isomerisation based pathways. The chelator probe has shown exceptionally high stroke's shift. The host guest interaction has been confirmed by different sophisticated analytical tools such as UV‐Vis, fluorescence, 1H‐NMR and FT‐IR. Significantly the fluorescence turn on phenomena has been utilized to detect intracellular OAc− inside candida albicans to explore the applicability of the chelator probe as bio sensor.
Sequential reaction of a N5O3 octadentate tripodal ligand with Ni(2+) and subsequently with Cu(2+) and azide ligand afforded the first example of a heterobridged (phenoxo/μ(1,1)-azido) pentanuclear heterometallic (Ni4Cu) compound, which exhibits a centrosymmetric vertex-sharing defective double-cubane structure. The study of the magnetic properties reveals that the compound shows ferromagnetic interaction interactions, leading to an S = 9/2 spin ground state. Density functional theory calculations on the X-ray structure and model compounds predict ferromagnetic interactions through the magnetic exchange pathways involving each couple of metal ions.
Homometallic (M2 and M4) and heterometallic (Ni4Cu) complexes were assembled from octadentate Schiff-base ligands, transition metal ions and ancillary ligands.
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