Synthesis, pH-induced “on–off–on” luminescence switching, and partially intercalative DNA-binding and DNA photocleavage properties of an β-d-allopyranoside-grafted ruthenium(II) complex

Melting dynamics of short dsDNA chains in saline solutions

“…The aim of present work is to study the dynamics of DNA melting in dilute brine environment. The denaturation of short DNA chains is usually employed in Biosensing (Sendroiu et al 2011 ; Toma et al 2014 ; Loget and Corn 2014 ) and grafting or anchor technology (Ma et al 2009 ; Seela et al 2011 ; Zhao et al 2012 ; Woller et al 2012 ). Besides, it is straight-forward to explore the mechanism of DNA melting by using short DNA chains than using long DNA chains (Wong and Pettitt 2008 ; Miyoshi and Sugimoto 2008 ).…”

pH-Switchable “Off–On–Off” Near-Infrared Luminescence Based on a Dinuclear Ruthenium(II) Complex

“…3c As a result, NIR-emissive pH sensors have received much attention. 4,5 Ruthenium(II) polypyridyl complexes have been extensively investigated as pH-induced on−off-, 6,7 off− on-, 8 off−on−off-, 9−12 and on−off−on-type 13 17 The dinuclear ruthenium(II) complex Ru1(ClO 4 ) 4 •4H 2 O was s y n t h e s i z e d b y u s i n g [ R u ( b p y ) 2 ( H L 1 ) ] ( C l O 4 ) 2 [Ru2(ClO 4 ) 2 ] 11,18 as the ligand to react with Ru(HL 2 )Cl 3 9 and characterized by elemental analysis, 1 H NMR (Figure S1), and electrospray ionization mass spectrometry (ESI-MS; Figure S2). 20 Ru1(ClO 4 ) 4 in CH 3 CN exhibits three strong UV π−π* absorption maxima at 240 nm (ε = 78939 M −1 cm −1 ), 284 nm (ε = 129887 M −1 cm −1 ), and 349 nm (structured, ε = 79146 M −1 cm −1 ) and two visible singlet metal-to-ligand charge-transfer ( 1 MLCT) absorption maxima at 456 nm (ε = 30813 M −1 cm −1 ) and 505 nm (ε = 43429 M −1 cm −1 ); these two low-energy absorption bands are distinct from the visible absorption features of the precursor complex Ru2 (456 nm and ε = 17731 M −1 cm −1 ) 11 and of two parent complexes of Ru3 (478 nm and ε = 15700 M −1 cm −1 ; Figure S3a) and Ru4 19 (453 nm and ε = 16600 M −1 cm −1 ) in absorption maximum and/or intensity, indicating the formation of a new complex of Ru1 with strongly coupled electronic states between the two moieties of Ru3 and Ru4 rather than a simple superposition between them.…”

Fluorescence Sensor with A New ON1–OFF–ON2 Switching Mechanism Using the Excited State Intermolecular Proton Transfer Reaction of An Anthracene‐diurea Compound

“…Most fluorescence sensors that have been investigated are based on ON-OFF or OFF-ON switching responses, showing significant emission enhancement or quenching; however, only a limited number of three-state ON-OFF-ON or OFF-ON-OFF responses have been explored. For example, ON-OFF-ON and OFF-ON-OFF sensing systems were reported for cations (12)(13)(14), pH (15)(16)(17)(18), anions (19)(20)(21)(22), and other chemical species (23,24), due to the ability to detect their concentration. Most of the work in anion sensing has involved the detection of fluoride anions, which show high reactivity with an anion sensor (25).…”