A simple and readily synthesized BODIPY based fluorescent chemosensor has been developed for the selective and sensitive detection of Cd2+ ions up to a submicromolar level in aqueous media.

A series of heterobimetallic wire-like organometallic complexes [(tpy-C6H4-R)­(PPh3)2Ru–CC–Fc]+ (tpy-C6H4-R = 4′-(aryl)-2,2′:6′,2′′-terpyridyl, Fc = [(η5-Cp)2Fe], R = -H, -Me, -F, -NMe2 in complexes 5–8, respectively) featuring ferrocenyl and 4′-(aryl)-2,2′:6′,2′′-terpyridyl ruthenium­(II) complexes as redox active metal termini, have been synthesized. Various spectroscopic tools, such as multinuclear NMR, IR spectra, HRMS, CHN analyses, and single crystal X-ray crystallography have been utilized to characterize the heterobimetallic complexes. The electrochemical and UV–vis–NIR spectroscopic studies have been investigated to evaluate the electronic delocalization across the molecular backbones of the Ru­(II)–Fe­(II) heterobinuclear organometallic dyads. Electrochemical studies reveal two well-separated reversible redox waves as a result of successive oxidation of the ferrocenyl and Ru­(II) redox centers. The spin density distribution analyses reveal that the initial oxidation process is associated with the Fe­(II)/Fe­(III) couple followed by one electron oxidation of the ruthenium­(II) center. The high K c value (0.11–1.73 × 1012) and intense NIR absorption, with molar absorption coefficient (in the order of 103 M–1 cm–1) for the RuIIFeIII mixed-valence species, signify strong electronic communication between the two metal termini. The electronic coupling constant (H ab) has been estimated to be 492 and 444 cm–1 for the structurally characterized complexes 6 and 7, respectively. The redox and NIR absorption features indicate that the mixed-valence system of the heterobinuclear dyads belongs to a Robin and Day “class II” system.

A multifunctional D-π-A push-pull arylene-vinylene conjugated terpyridine, 4'-(4-{2-[4-[bis(4-thiophen-2-yl-phenyl)amino]phenyl-ethenyl}phenyl)-2,2':6',2''-terpyridine has been designed and successfully developed. Photophysical properties was systematically explored showing tunable multifunctional behaviors including solvatochromism, vapochromism, piezofluorochromism and remarkable chemosensing...