The first fifty years of the chemistry of 2,2'-bipyridine are reviewed from its first discovery in 1888 to the outbreak of the second global conflict in 1939. The coordination chemistry and ...analytical applications are described and placed in the context of the increasingly sophisticated methods of characterization which became available to the chemist in this time period. Many of the "simple" complexes of 2,2'-bipyridine reported in the early literature have been subsequently shown to have more complex structures.
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•We have synthesized photoluminescent ternary samarium β-diketonate complexes with heterocyclic neutral ligands.•Optical and luminescent nature of red color emissive ternary samarium ...complexes have been studied in detail.•Photoluminescence emission spectra specify that β-diketone ligand efficiently sensitized Sm(III) ion via antenna effect.•Synthesized luminescent materials could found good significance in solid state electronics, flat panel devices and OLEDs.
The octa coordinated complexes of Sm3+ with dibenzoylmethane (DBM) having general formula Sm(X)3(Y) were synthesized in powdered form and characterized spectroscopically. Here, X is dibenzoylmethane (DBM) and Y represents respective substituted 2,2′-bipyridine derivatives. The luminescent characteristics of ternary samarium complexes have been studied in detail. Upon excitation in UV range, bands at 566 nm, 606 nm, 648 nm (highly intense) and 710 nm were appeared in emission spectra of complexes attributed to characteristic transitions of Sm(III) ion. The luminescence in complexes is observed mainly because of (i) good sensitization of Sm(III) ion by auxiliary units (ii) removal of non-radiative deactivation routes by vibrations of O-H and N-H bonds. Various investigations reveal the similar structure of all the synthesized samarium complexes. The emissive properties of Sm(III) complexes show that these complexes might be utilized as good candidate in lighting and display sources.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UILJ, UL, UM, UPUK, ZAGLJ, ZRSKP
Disclosed herein are structures designed to incorporate pyrrolidine, which is a privileged organocatalyst structure, and bipyridine, which is among the most widely used metal ligands. Robust and ...scalable synthetic routes to five such compounds have been established. These novel structures may be useful in metal-organic cooperative catalyzed transformations, or as organocatalysts or metal ligands.
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BFBNIB, DOBA, GIS, IJS, IZUM, KILJ, KISLJ, NUK, PILJ, PNG, SAZU, UILJ, UKNU, UL, UM, UPUK
•Two novel Cu(II) and Pb(II) metal complexes coupling on 2,4-dihydroxybenzoic acid and 2,2′-bipyridine ligands were synthesized and characterized.•Intermolecular interactions were analyzed by ...Hirshfeld surfaces and 2D fingerprint plots.•Cu(C10H8N2)2(C7H5O4)(C7H5O4)·3H2O changes the decomposition process of RDX from melting decomposition to solid phase decomposition.•The introduction of carbon framework ligand provides a new insight for the design of novel combustion catalysts.
To further enhance the catalytic performance of copper/lead 2,4-dihydroxybenzoate salt, two novel ternary complexes, Cu(C10H8N2)2(C7H5O4)·3H2O (complex 1) and Pb(C10H8N2)(C7H5O4)2·H2O (complex 2) were designed by introducing carbon framework ligand. The molecular structures of complexes 1 and 2 were determined by single crystal X-ray diffraction analysis. Both complex 1 and complex 2 were crystallized in the monoclinic crystal system. The difference is that the central Cu ion in complex 1 is connected to one oxygen atom of the carboxyl group of 2,4-dihydroxybenzoic acid, while the other 2,4-dihydroxybenzoic acid anion only acts as a counterion to balance the charge. But the central Pb ion in complex 2 is connected to four oxygen atoms of the carboxyl groups of two 2,4-dihydroxybenzoic acid and forms a six-coordinated structure. The Hirshfeld surface and associated 2D fingerprint analysis offer valuable insights into the intermolecular interactions within the crystal structure. Importantly, the thermal analysis results show that the thermal decomposition temperature of complex 1 is 204.1 °C, which has better thermal stability than complex 2. Furthermore, complex 1 showed remarkable catalytic activity on RDX compared to complex 2, and changed the thermal decomposition of RDX from melting decomposition to solid phase decomposition. This study will provide a new insight into development of combustion catalysts.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UILJ, UL, UM, UPUK, ZAGLJ, ZRSKP
Fluorescent compounds are fascinating appreciable attention in various display devices such as solid state lighting, flat panel displays. 2,2′-Bipyridine (bpy), a non-fluorescent compound is ...frequently used as ancillary unit in the metal complexes. This paper reflects the synthesis of fluorescent derivatives of 2,2′-bipyridine. These organic heteroaromatic derivatives have found numerous applications in electroluminescent devices. The main intention of this paper is to synthesize and characterize the neutral chelating ligands. The compounds were analyzed by various spectroscopic techniques. Photophysical properties of the compounds were identified with the help of photoluminescence spectra. Electrochemical behavior of the compounds was studied by recording I-V curves from cyclic voltammetry. Computational quantum calculations using Avogadro interface were also done in order to attain the molecular mechanics and their electronic energy. Optical band gap data clearly indicated the good kinetic stability and chemical inertness of the compounds.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UILJ, UL, UM, UPUK, ZAGLJ, ZRSKP
Molecular passivation on perovskite surface is an effective strategy to inhibit surface defect‐assisted recombination and reduce nonradiative recombination loss in perovskite solar cells (PSCs). ...However, the majority of passivating molecules bind to perovskite surface through weak interactions, resulting in weak passivation effects and susceptible to interference from various factors. Especially in carbon‐based perovskite solar cells (C‐PSCs), the molecular passivation effect is more susceptible to disturbance in subsequent harsh preparation of carbon electrodes via blade‐coating route. Herein, bidentate ligand 2,2′‐Bipyridine (2Bipy) is explored to passivate surface defects of CsPbI2.6Br0.4 perovskite films. The results indicate that compared with monodentate pyridine (Py), bidentate 2Bipy shows a stronger chelation with uncoordinated Pb(II) defects and exhibits a greater passivation effect on perovskite surface. As a result, 2Bipy‐modified perovskite films display a significantly boosted photoluminescence lifetime, accompanied by excellent anchoring stability and anti‐dissociation of passivating molecules. Meanwhile, the moisture resistance of the 2Bipy‐modified perovskite films is also significantly enhanced. Consequently, the efficiency of C‐PSCs is improved to 16.57% (Jsc = 17.16 mA cm−2, Voc = 1.198 V, FF = 80.63%). As far as it is known, this value represents a new record efficiency for hole transport material‐free inorganic C‐PSCs.
Bidentate ligand 2,2′‐Bipyridine enables a stable chelate structure with uncoordinated Pb(II) on CsPbI2.6Br0.4 perovskite surface, thus passivating surface defects. Compared with monodentate ligand pyridine, it has a more stable passivation effect and outstanding anti‐dissociation performance. The champion cell achieves an efficiency of 16.57%, which represents a new record efficiency for hole transport material‐free inorganic C‐PSCs.
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BFBNIB, FZAB, GIS, IJS, KILJ, NLZOH, NUK, OILJ, SAZU, SBCE, SBMB, UL, UM, UPUK
Dumbbell‐shaped bipyridines, featuring distal steric effects of bipyridine C5‐ and C5’‐triarylmethyl substituents, allowed controlled monochelation to transition metals. These newly synthesized ...ligands showed improved ligand performance compared to conventional bipyridine ligands in the Ni‐catalyzed cross‐electrophile coupling and the Ni/photoredox‐synergistically catalyzed decarboxylative coupling. More information can be found in the Communication by T. Iwai, M. Sawamura, et al. on page 2289.
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Spectroelectrochemical Sensor for Spectroscopically Hard‐To‐Detect Metals by In‐Situ Formation of a Luminescent Complex Using Ru(II) as a Model Compound This image shows the general method of ...electrogeneration of an emissive, electrochemically reversible ruthenium complex, with the concurrent spectroscopic measurement. More details are discussed in the article by Amanda M. Lines, Joshua D. Warner, William R. Heineman, Sue B. Clark, and Samuel A. Bryan. DOI: 10.1002/elan.201800427
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•Heteroleptic ternary samarium complexes were synthesized.•Optical and photophysical characteristics of complexes were examined spectroscopically.•From Tauc’s relation, optical band ...gap was determined.•PL emission spectra evince most intense peak at 649 nm (4G5/2→6H9/2).•Might be suitable candidate for display applications.
A series of samarium β-diketonates comprising nitrogen-heterocyclic auxiliary moiety were synthesized and characterized spectroscopically. A comprehensive analysis of complexes suggests the octacoordinated environment about samarium ion and similar structural behavior of complexes. The samarium ion is coordinated via carbonyl oxygen of diketone unit and nitrogen of neutral ligand. Energy band gap values of complexes lie in range of semiconducting materials. The photophysical properties of complexes were evaluated from photoluminescence spectra of complexes. By examining the energy transfer pathway and emission spectra, the sensitizing nature of chromophoric ligands is revealed. These synthesized complexes have shown peak around 649 nm (4G5/2→6H9/2) due to electric dipole transition. Results of luminescence spectra and colorimetric analysis have demonstrated the emission of synthesized samarium complexes in reddish orange region. The optical and photophysical properties of complexes claim the usefulness of prepared samarium complexes in designing display devices.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UILJ, UL, UM, UPUK, ZAGLJ, ZRSKP
The few commercially available chemosensors and published probes for in vitro Znsup.2+ detection in two-photon microscopy are compromised by their flawed spectroscopic properties, causing issues in ...selectivity or challenging multistep syntheses. Herein, we present the development of an effective small molecular GFP chromophore-based fluorescent chemosensor with a 2,2′-bipyridine chelator moiety (GFZnP BIPY) for Znsup.2+ detection that has straightforward synthesis and uncompromised properties. Detailed experimental characterizations of the free and the zinc-bound compounds within the physiologically relevant pH range are presented. Excellent photophysical characteristics are reported, including a 53-fold fluorescence enhancement with excitation and emission maxima at 422 nm and 492 nm, respectively. A high two-photon cross section of 3.0 GM at 840 nm as well as excellent metal ion selectivity are reported. In vitro experiments on HEK 293 cell culture were carried out using two-photon microscopy to demonstrate the applicability of the novel sensor for zinc bioimaging.
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