The synthesis and structural characterization of a new trimethylplatinum(IV) iodide complex of 4'‐(4‐methoxyphenyl)‐2,2':6',2''‐terpyridine ligand L, {PtMe3IL} (1) is reported. The X‐ray crystal structure shows that the terpyridine ligand L binds the platinum(IV) metal center in bidentate fashion, which is well supported by the 1H NMR spectrum of 1. The complex 1 upon crystallization with 1,4‐diiodotetrafluorobenzene (DITFB) forms the halogen bonded complex 1a (1·DITFB). The structural investigation shows that 1a exhibits the halogen bonding interaction in which the non‐coordinated pyridyl nitrogen acts as halogen bond acceptors by forming I···N interaction with iodine atom of DITFB. In addition iodine atom of complex 1 also acts as weak halogen bond acceptor.
A simple fluorescent sensor of zinc-terpyridine complex of the terpyridine ligand 4'-(3,4,5-trimethoxyphenyl)-2,2' : 6',2''-terpyridine was prepared and utilized for selective sensing of pyrophosphate anion (PPi) in aqueous medium at physiological pH. The sensor complex showed an excellent selectivity of PPi over various other anions such as Cl À , F À , Br À , I À , CO 3 2À , HCO 3 À , NO 3 À , OH À , HPO 4 2À , SO 4 2À , SO 3 2À , S 2 O 3 2À in water. UV-Visible and fluorescence spectroscopic method have been used to perform the detection study. The sensor complex showed~50 fold enhancement of fluorescence intensity upon addition of PPi and excellent sensitivity with lowest limit of detection (LOD) for the detection of PPi anion was found to be~300 nM.
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