Jiao Geng

Bio: Jiao Geng is an academic researcher from Nanjing University. The author has contributed to research in topics: Denticity & Schiff base. The author has an hindex of 11, co-authored 21 publications receiving 265 citations.

Two pairs of 1 : 2 nickel(II) and copper(II) metal-complex dyes showing the same trans configuration and azo–hydrazone transformation but different thermal properties

Abstract: Two pairs of 1 : 2 neutral trans mononuclear transition-metal (M = NiII and CuII) complexes of pyridine-2,4-dione and quinoline-2,4-dione based heterocyclic dyes have been structurally and spectrally characterized and compared herein. X-ray single-crystal diffraction analyses of four complexes, namely trans-[Ni(La)2(DMF)2] (1), trans-[Cu(La)2(DMF)2] (2), trans-[Ni(Lb)2(DMF)2] (3) and trans-[Cu(Lb)2(DMF)2] (4), reveal that they have the same trans configuration between the bidentate chelating dianionic ligands and two axially coordinated DMF molecules. Furthermore, a transformation from the hydrazone to azo configuration has been observed for both bidentate chelating ligands La− and Lb− after metal-ion complexation. More importantly, the simultaneous DSC/TG-MS-FTIR method has been used to explore the thermal stability of four neutral metal-complex dyes 1–4, where the two axially coordinated DMF molecules in NiII and CuII complexes exhibit distinguishable decomposition behavior because of their different M–O bond lengths originating from the Jahn–Teller distortions.

A ratiometric fluorescent probe for ferric ion based on a 2,2′-bithiazole derivative and its biological applications

Abstract: A new bithiazole-based ratiometric fluorescent chemosensor 4,4′-n-butyl-5,5′-(pyridin-4-yl)-2,2′-bithiazol (L) is prepared and its metal ion sensing properties have been investigated It exhibits high sensitivity and selectivity toward Fe 3+ among a series of metal ions in EtOH: H 2 O (9:1, v/v) The probe displays a quick response for Fe 3+ over a broad pH range, and the presence of Fe 2+ can also be detected by adding an oxidant like Na 2 O 2 or H 2 O 2 The association constant of resultant [FeL 2 ] cation is calculated to be 276 × 10 3 M −2 , and the detection limit for Fe 3+ is found to be 06 μM The living cell and zebrafish imaging experiments demonstrate its value on the practical applications for biological systems

Synthetic ratiometric fluorescent probes for detection of ions

Abstract: Metal cations and anions are essential for versatile physiological processes. Dysregulation of specific ion levels in living organisms is known to have an adverse effect on normal biological events. Owing to the pathophysiological significance of ions, sensitive and selective methods to detect these species in biological systems are in high demand. Because they can be used in methods for precise and quantitative analysis of ions, organic dye-based ratiometric fluorescent probes have been extensively explored in recent years. In this review, recent advances (2015-2019) made in the development and biological applications of synthetic ratiometric fluorescent probes are described. Particular emphasis is given to organic dye-based ratiometric fluorescent probes that are designed to detect biologically important and relevant ions in cells and living organisms. Also, the fundamental principles associated with the design of ratiometric fluorescent probes and perspectives about how to expand their biological applications are discussed.

Influence of Ancillary Ligands in Dye-Sensitized Solar Cells.

Abstract: Dye-sensitized solar cells (DSSCs) have motivated many researchers to develop various sensitizers with tailored properties involving anchoring and ancillary ligands. Ancillary ligands carry favorable light-harvesting abilities and are therefore crucial in determining the overall power conversion efficiencies. The use of ancillary ligands having aliphatic chains and/or π-extended aromatic units decreases charge recombination and permits the collection of a large fraction of sunlight. This review aims to provide insight into the relationship between ancillary ligand structure and DSSC properties, which can further guide the function-oriented design and synthesis of different sensitizers for DSSCs. This review outlines how the new and rapidly expanding class of chelating ancillary ligands bearing 2,2′-bipyridyl, 1,10-phenanthroline, carbene, dipyridylamine, pyridyl-benzimidazole, pyridyl-azolate, and other aromatic ligands provides a conduit for potentially enhancing the performance and stability of DSSCs. F...

In vitro cytotoxicity activity of novel Schiff base ligand-lanthanide complexes

Abstract: A Schiff base ligand (SBL), N2, N3-bis (anthracen-9-ylmethylene) pyridine-2, 3-diamine, was synthesized through the condensation of 2,6-diaminopyridine and anthracene-9-carbaldehyde using a 1:2 ratio. 1H NMR spectra confirmed the observation of non-involvement aromatic carboxylic proton in SBL. A novel series of lanthanide (i.e., praseodymium (Pr), erbium (Er), and ytterbium (Yb))-based SBL metal complexes was successfully synthesized, and their functional groups were elaborately demonstrated using UV–visible, Fourier transform infrared (FT-IR), and fluorescence spectroscopy analyses. FT-IR spectral studies revealed that SBL behaved as a bidentate ligand and it was structured with metal ions by the two azomethine nitrogens. The synthesized SBL-based metal complexes were elaborately performed for cytotoxicity activity versus Vero, human breast cancer (MCF7), and cervical (HeLa) anticancer cell lines.