The Coordination Chemistry of 3,3′-Diamino-2,2′-bipyridine and Its Dication: Exploring the Role of the Amino Groups by X-ray Crystallography

Amino‐Substituted 2,2′‐Bipyridine Ligands as Fluorescent Indicators for ZnII and Applications for Fluorescence Imaging of Prostate Cells

“…The series of five ligands were chosen to compare compounds with differing excited states and different strengths of electron donating substituents, to determine the characteristics best suited for Zn II sensing in a biological system. Compounds 1 and 2 were synthesized by previously reported methods . Scheme highlights the syntheses of compounds 4 , 6 , and 7 .…”

“…Quantum yields were determined on aerated methanol solutions using quinine sulfate in 0.05 m H 2 SO 4 as a standard ( φ =0.52). 3,3′‐Diamino‐2,2′‐bipyridine ( 1 ), 5,5′‐diamino‐2,2′‐bipyridine ( 2 ), and 2,2′‐bipyridine‐5,5′‐dicarboxylic acid ( 5 ) were synthesized according to previously reported procedures.…”

Crystal structure of tris(3-(2-pyridyl)pyrazole)zinc(II)tetrachlorido zincate(II), C24H21Cl4N9Zn2

“…Herein, we report the crystal structure of the title compound. In the title compound, all the bond lengths are within normal ranges [5], similar to its two analogues [6,7]. One Zn(II) is …”

A competition between O⋯N and O⋯C through space interactions in the crystal structures of 3,3′-dinitro-2,2′-bipyridine N-oxides and N,N′-dioxides

“…Preparation of 3,39-dinitro-2,29-bipyridine-1-oxide 13 and 3,39-dinitro-2,29-bipyridine-1,19-dioxide 14 3-Chloroperbenzoic acid (5.98 g, 58-84% purity, Aldrich) dissolved in chloroform (60 ml) was added to a solution of 3,39-dinitro-2,29-bipyridine 1 36 (2.0 g, 8.12 mmol) in chloroform (140 ml) at 0 uC and stirred for 3 h, then stirred at 34 uC overnight. TLC (CHCl 3 with 5% CH 3 OH) indicated formation of the monoxide as the main product.…”