Unprecedented examples of double-addition of aromatic amines across a ruthenium(II)-coordinated nitrile function: Isolation and X-ray structures of ruthenium complexes of amidinate and cyclometalated amidine

Nanomolar-level selective dual channel sensing of Cu2+and CN−from an aqueous medium by an opto-electronic chemoreceptor

A novel chromogenic and fluorogenic chemoreceptor exhibiting a proclivity towards Cu²⁺and CN⁻, with applications in bioimaging and molecular electronics, was developed.

Small molecular probe as selective tritopic sensor of Al3+, F- and TNP: Fabrication of portable prototype for onsite detection of explosive TNP

Schiff base organic compound (SOC) has been prepared as a tritopic chemosensor for selective sensing by fluorescence signalling towards ions like Al³⁺, F^- and explosive molecule like TNP. In general, fluorescence like photophysical property has been used for selective detection of analyte where Al³⁺ and F^- show turn-on fluorescence signal at different wavelengths (nm) however, quenching was found with TNP. As a consequence, the chemosensor has become a selective sensor for Al³⁺, F^- and TNP. Reversibility of fluorescence responses for Al³⁺ and F^- are observed in presence of ammonium nitrate and H⁺ respectively. Similar to the detection of TNP, the detection of explosive like NO₃^- salts is also essential from homeland security point of view. In the present work, the finding of reversible sequential fluorescence response can be promoted for fabrication of next generation AND-NOT-OR-NAND-XOR-XNOR-NOR based complex logic circuit which is applicable in photonics, security and other fields including inorganic and material science. In the case of TNP recognition, the pathway mainly depends on non-covalent interaction (quenching constant: 4.4 × 10⁵ M^-1) which is even better than the recently reported materials. Detection limit for Al³⁺, F^- and TNP is 1 μM, 3 μM and 500 nM respectively. DFT-D3 has been carried out to explore the host⋯guest interaction along with the structure-property correlation of the present host-guest system. All three guest analytes have been detected inside the living cell at a certain level and in its consequence, the successful in vitro recognition ability of the SOCs inside human cell line HeLa has been explored too. In real time stepping, an easy to operate and an economically affordable pocket prototype has also been fabricated for on spot detection of TNP like explosive.

How paramagnetic and diamagnetic LMOCs detect picric acid from surface water and the intracellular environment: a combined experimental and DFT-D3 study

Diamagnetic and paramagnetic luminescent metal organic complexes (LMOCs) have been reported for explosive and pollutant nitro aromatic (epNAC) recognition.

Dissecting out the effect of Ru-OAr bonding in a five-coordinate complex of ruthenium (II)

Blue Ru(o-cat)(PPh3)3 (5; o-cat = ortho-catecholate), obtained in 94% yield by reaction of RuCl2(PPh3)3 (4) with dithallium catecholate, was characterized by NMR, MALDI-MS, IR, and single crystal X-ray analysis, and by a combined electronic spectroscopy and time-dependent density functional theory (TD-DFT) study. The frontier orbitals in 5 participate in a low-energy charge transfer excitation involving donation from the Ru-catecholate π bond (largely localized on catecholate) to a low-lying σ* orbital on Ru-PPh3(apical). The energy of this transition increases on binding a pyridine ligand in the sixth site.Key words: ruthenium aryloxide, catecholate, phosphine, electronic spectroscopy, time-dependent DFT.