Activating Inert Alkali-Metal Ions by Electron Transfer from Manganese Oxide for Formaldehyde Abatement

2017 ◽  
Vol 24 (3) ◽  
pp. 681-689 ◽  
Author(s):  
Jiayi Gao ◽  
Zhiwei Huang ◽  
Yaxin Chen ◽  
Jing Wan ◽  
Xiao Gu ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Alkali Metal ◽  
Metal Ions ◽  
Manganese Oxide ◽  
Alkali Metal Ions

Electrochemical Intercalation of Alkali-Metal Ions into Birnessite-Type Manganese Oxide in Aqueous Solution

Langmuir ◽  
1997 ◽  
Vol 13 (25) ◽  
pp. 6845-6849 ◽  
Author(s):  
Hirofumi Kanoh ◽  
Weiping Tang ◽  
Yoji Makita ◽  
Kenta Ooi
Keyword(s):  
Aqueous Solution ◽  
Alkali Metal ◽  
Metal Ions ◽  
Manganese Oxide ◽  
Alkali Metal Ions ◽  
Electrochemical Intercalation

The Formation of Fluorescent Alkali Metal and Alkaline Earth Complexes by 1-(2-{10-[2-Piperazinoethyl]-9-anthryl}ethyl)piperazine and Alkaline Earth Complexes by 4-(2-{10-[2-(1,4-Thiazinan-4-yl)ethyl]-9-anthryl}ethyl)thiomorpholine in Acetonitrile

2003 ◽  
Vol 56 (9) ◽  
pp. 917 ◽  
Author(s):  
Jason P. Geue ◽  
Nicholas J. Head ◽  
A. David Ward ◽  
Stephen F. Lincoln
Keyword(s):  
Electron Transfer ◽  
Quantum Yield ◽  
Alkali Metal ◽  
Metal Ions ◽  
Photoinduced Electron Transfer ◽  
Alkaline Earth ◽  
Alkali Metal Ions ◽  
Sandwich Complex ◽  
Complexation Constant ◽  
Typical Data

The formation of fluorescent alkali metal and alkaline earth complexes of 1-(2-{10-[2-piperazinoethyl]-9-anthryl}ethyl)piperazine (1) and alkaline earth complexes by 4-(2-{10-[2-(1,4-thiazinan-4-yl)ethyl]-9-anthryl}ethyl)thiomorpholine (2) in acetonitrile is reported. Both (1) and (2) have ‘fluorophore–spacer–receptor’ structures in the sequences ‘anthracene–dimethylene–piperazine’ and ‘anthracene–dimethylene–thiomorpholine’, respectively. Complexation by alkali metal ions and alkaline earth ions, Mm+, modulate photoinduced electron transfer (PET) to increase the fluorescence of (1) and complexation of alkaline earth ions similarly increases the fluorescence of (2). The two receptors of (1) and (2) may either complex Mm+ singly to form [ML]m+ or cooperatively to form a ‘sandwich’ complex [ML′]m+ characterized together by complexation constant K1 and quantum yield φ1. They may also complex two Mm+ in [M2L]2m+ characterized by K2 and φ2. Typical data are exemplified for (1) and Mm+ = Na+ by K1 = 1.33 × 105 dm3 mol–1 (φ1 = 0.02) and K2 = 4.20 × 102 dm3 mol–1 (φ1 = 0.07), for (1) and Mm+ = Ca2+ by K1 = 3.2 × 106 dm3 mol–1 (φ1 = 0.34) and K2 = 1.32 × 104 dm3 mol–1 (φ2 = 0.54), and for (2) and Mm+ = Ca2+ by K1 = 2.29 × 104 dm3 mol–1 (φ1 = 0.20) and K2 = 8.0 × 102 dm3 mol–1 (φ2 = 0.57) at 298.2 K and I = 0.05 mol dm–3 (NEt4ClO4). These data are compared with those for the alkaline earth complexes of 4-{2-[10-(2-morpholinoethyl)-9-anthryl]ethyl}morpholine. In 40 : 60 (v/v) 1,4-dioxan/water, protonation modulates PET to increase the fluorescence of (1)H44+ and (2)H22+. (The pKa values of (1)H44+ are 9.02, 8.06, 4.32, and 2.96 at 298.2 K and I = 0.05 mol dm–3 (NEt4ClO4).) The syntheses of (1) and (2) are reported.

Alkali Metal Ions Insertion/Extraction Reactions with Hollandite-Type Manganese Oxide in the Aqueous Phase

1995 ◽  
Vol 7 (1) ◽  
pp. 148-153 ◽  
Author(s):  
Qi Feng ◽  
Hirofumi Kanoh ◽  
Yoshitaka Miyai ◽  
Kenta Ooi
Keyword(s):  
Alkali Metal ◽  
Metal Ions ◽  
Manganese Oxide ◽  
Aqueous Phase ◽  
Alkali Metal Ions
Sign in / Sign up

Export Citation Format

Share Document