Structural Investigation and Optical Properties of Dysprosium (Dy) Ions Doped Oxyfluoro Antimony Borate Glasses for Photonics Applications.

Dysprosium oxide-doped glasses with a composition of 60BO-10SbO-10AlO-10NaF-(10-x) LiF-xDyO (x = 0.1,0.5, 1.

Pt(II) Tetrafacial Barrel with Aggregation-Induced Emission for Sensing.

A new tetraphenylpyrazine-based tetraimidazole ligand () was synthesized and used for subcomponent self-assembly with -(tmeda)Pd(NO) and -Pt(PEt)(OTf), leading to the formation of two tetrafacial barrels [Pd(tmeda)](NO) () and [Pt(PEt)](OTf) (), respectively. Although ligand is aggregation-induced emission (AIE) active, barrel showed a magnificently higher AIE activity than ligand , while failed to retain the AIE properties of the ligand. Pd(II) barrel , undergoing an aggregation-caused quenching (ACQ) phenomenon, nullified the AIE activity of the ligand to be used in the photophysical application.

Self-Assembly of an [M L2 ] Intertwined Cube and a Giant [M L1 ] Orthobicupola.

Through coordination-driven self-assembly, aesthetically captivating structures can be formed by tuning the length or flexibility of various components. The self-assembly of an elongated rigid terphenyl-based tetra-pyridyl ligand (L1) with a cis-Pd(II) acceptor produces an [M L1 ] triangular orthobicupola structure (1). When flexibility is introduced into the ligand by the incorporation of a -CH - group between the dipyridylamine and terphenyl rings in the ligand (L2), anunique [M L2 ] water-soluble 'intertwined cubic structure' (2) results.

Shifting the Triangle-Square Equilibrium of Self-Assembled Metallocycles by Guest Binding with Enhanced Photosensitization.

Shifting a triangle-square equilibrium in one direction is an important problem in supramolecular self-assembly. Reaction of a benzothiadiazole-based diimidazole donor with a -Pt(II) acceptor yielded an equilibrium mixture of a triangle () and a square (). We report here the shifting of such equilibrium toward a triangle using a guest (pyrene aldehyde, ).

An Adaptable Water-Soluble Molecular Boat for Selective Separation of Phenanthrene from Isomeric Anthracene.

Anthracene crude oil is a common source of phenanthrene for its industrial use. The isolation of phenanthrene from this source is a challenging task due to very similar physical properties to its isomer anthracene. We report here a water-soluble Pd(II) molecular boat () with unusual structural topology that was obtained by assembling a flexible tetrapyridyl donor () with a -Pd(II) acceptor.

Self-Assembled Pd Coordination Cage as Photoregulated Oxidase-Like Nanozyme.

Designing supramolecular architectures with uncommon geometries embedded with functional building units is of immense importance in contemporary research. In this report, we present a new water-soluble PdL supramolecular coordination nanocage () that was synthesized via self-assembly of a tetradentate donor () with ditopic acceptor -[(en)Pd(NO)] [en = ethylenediamine]. Self-assembly of a tetratopic donor with a cis-blocked 90° acceptor commonly produces tri/tetra- or hexagonal barrel-type structures.

Self-Assembled Pt Metallosupramolecular Tubular Cage as Dual Warhead Antibacterial Agent in Water.

Development of photosensitizer-based self-assembled metallosupramolecular architectures with important applications is an emerging trend in supramolecular chemistry. In this study, we report a new benzothiadiazole-based tetra-pyridyl ligand (), which upon self-assembly with a block 90° Pt(II) acceptor generated an unprecedented tetrafacial Pt(II) photoactive tubular molecular cage (). This cage could bring an extraordinary photosensitizer, benzothiadiazole, into water which is otherwise insoluble.

Long Range Emissive Water-Soluble Fluorogenic Molecular Platform for Imaging Carbon Monoxide in Live Cells.

Despite its murderous act, carbon monoxide (CO) is found to be a very crucial small gaseous messenger molecule in dictating prime biological and physiological processes. Determination of endogenous or exhaled CO levels can throw significant light on smoking status and can be used as a breath biomarker of inflammatory diseases. Therefore, fluorescence imaging of CO in biofluids will empower one with the minute details of various disease states that involve CO.

Zn(ii)-based coordination polymer: An emissive signaling platform for the recognition of an explosive and a pesticide in an aqueous system.

A new emissive Zn(ii)-based coordination polymer (Zn-CP) bearing paddle-wheel clusters has been developed and the same has been demonstrated to have potential for recognising a nitroaromatic-based explosive (TNP) and a pesticide (2,6-DCNA) in aqueous solution. The structural integrity of this newly developed 2D material was established through single-crystal analysis, whereas the stability of Zn-CP in aqueous medium after the recognition process was investigated by the powder-XRD technique. A combination of experimental and theoretical studies revealed that the change in fluorescence intensity of Zn-CP while interacting with TNP and 2,6-DCNA was possibly due to simultaneous operation of PET and FRET.

A Polycarboxyl-Decorated Fe -Based Xerogel-Derived Multifunctional Composite (Fe O /Fe/C) as an Efficient Electrode Material towards Oxygen Reduction Reaction and Supercapacitor Application.

Low cost, non-noble metal catalysts with a good oxygen reduction reaction (ORR) activity comparable to that of platinum and also having good energy storage properties are highly desirable but challenging. Several challenges are associated with the development of such materials. Herein, we demonstrate a new polycarboxyl-functionalised Fe -based gel material, synthesised following a solvothermal method and the development of its composite (Fe O /Fe/C) by annealing at optimised temperature.

A metal-organic framework based multifunctional catalytic platform for organic transformation and environmental remediation.

Given the need for an efficient reaction platform, a multifunctional material has been developed through the integration of iodine into a Cd based MOF as a new catalytic system for organic transformation. Furthermore, the Cd-MOF itself has been successfully used as a potential material for photocatalytic dye degradation. The iodine incorporated MOF showed tremendous efficiency in organic catalysis for the synthesis of a library of benzimidazole derivatives with yield >80%.

A long-range emissive mega-Stokes inorganic-organic hybrid material with peripheral carboxyl functionality for As(v) recognition and its application in bioimaging.

We demonstrate a strategy for the recognition of As in aqueous solution using a red-emissive probe based on a perylene-Cu ensemble decorated with peripheral free carboxyl functionality. Single crystal analysis helped us to understand the chemical structure of the probe. To the best of our knowledge, this is the first probe for arsenic detection which emits in the red region (λ = 600 nm).

Modified Atomic Orbital Overlap: Molecular Level Proof of the Nucleophilic Cleavage Propensity of Dinitrophenol-Based Probes.

Out of six possible positional isomers of dinitrophenol, only 2,4-DNP has been used extensively by many researchers for developing reactive molecular probes. But the question remains unanswered: why has only the 2,4-isomer emerged as a labile protecting group? To answer this question, six molecular probes using available DNP isomers were developed and investigated to evaluate the effect of the extent of atomic orbital overlap on their reactivity. We have proved for the first time at the molecular level that the o-NO group contributes less compared to the p-NO group toward the reactivity of 2,4-DNP-based probes.

Novel metal-organic framework with tunable fluorescence property: supramolecular signaling platform for polynitrophenolics.

With the aid of a rotational C3-symmetric tricarboxytriphenylamine based ligand, a new Cd-MOF was synthesized and characterized by various spectroscopic techniques as well as by single-crystal X-ray diffraction analysis. The structural investigation of the crystalline Cd-MOF complex revealed the existence of unique three symmetry independent coordination environments of Cd(ii) ions with common octahedral and pentagonal bipyramidal geometries. Small cavities with dimensions 6.

Turn-on trivalent cation selective chemodosimetric probe to image native cellular iron pools.

A new turn-on cell permeable chemodosimetric probe has been developed and its application in the selective detection of trivalent cations (Fe(3+)/Cr(3+)/Al(3+)) at a sub-nanomolar level has been demonstrated. The selectivity of over a broad spectrum of mono- and divalent metal ions was established using fluorescence spectroscopy. Moreover, the changes in the absorption spectra of in the presence of trivalent cations enabled the most bio-relevant metal ion Fe(3+) over Cr(3+)/Al(3+) to be distinguished.