A highly selective fluorescence sensor for Tin (Sn 4+) and its application in imaging live cells

Scopus: A naphthalimide-rhodamine B derivative was synthesized as a fluorescence turn-ON chemodosimeter for Sn 4 . A colour change and marked enhancement of fluorescence was found in the presence of Sn 4 , Cu 2 and Cr 3 due to the ring open reaction of rhodamine and a fluorescence resonance energy transfer process. Addition of the strong chelating agent ethylenediaminetetraacetic acid disodium salt (EDTA) partly released the cation from the complex with Sn 4 and restored the yellow fluorescence. In addition, the compound can be used as a fluorescent probe for Sn 4 in biological systems and may act as a tool with which to study the physiological functions of tin or pathogenesis in the human body


Organic and Biomolecular Chemistry
Volume 10, Issue 33, 7 September 2012, Pages 6740-6746
A highly selective fluorescence sensor for Tin (Sn 4+) and its application in imaging live cells
Wang, Q., Li, C., Zou, Y., Wang, H., Yi, T. , Huang, C.  
Department of Chemistry, Fudan University, 220 Handan Road, Shanghai, China

First-principles study on the magnetic properties of six potential half-metallic ferromagnets: Alkaline-earth (Ca, Sr) doped XC (X=Si, Ge, Sn)

Computational Materials Science: Six half-metallic ferromagnets X0.75Y0.25C (X=Si, Ge, Sn and Y=Ca and Sr) with zinc-blende structure, resulting from alkaline-earth (Ca, Sr) substitution for X, are predicted based on the density functional theory. The calculated total magnetic moments of these ferromagnets are all integer 2.00μB per supercell, which are one of important characters of half-metallic ferromagnets. Our calculations indicate that X0.75Y0.25C have wide spin gap and potentially have high Curie temperature. Alkaline-earth doping results in the spin-polarization and half-metallicity of these compounds. It is confirmed that the p–d exchange coupling is responsible for the ferromagnetism of X0.75Y0.25C.


Computational Materials Science
Volume 65, December 2012, Pages 1–5
First-principles study on the magnetic properties of six potential half-metallic ferromagnets: Alkaline-earth (Ca, Sr) doped XC (X = Si, Ge, Sn)
Xiao-Ping Wei, Jian-Bo Deng, Hong Deng, Shi-Bin Chu, Xian-Ru Hu, 
Department of Physics, LanZhou University, Lanzhou 730000, People’s Republic of China
Received 29 March 2012. Revised 2 June 2012. Accepted 12 June 2012. Available online 24 July 2012.

Magnetic properties and structural transformations in Ni–Co–Mn–Sn multifunctional alloys

Acta Materialia: A systematic study of the magnetic properties and both the temperature and magnetic-field-induced structural transformations in the Ni50−xCoxMn39Sn11 (0⩽x⩽10) multifunctional alloys over a large temperature range from 500 K down to 10 K was performed. It is revealed that, with increasing x, the martensitic transformation temperatures first decrease slowly when 0⩽x⩽4 and then decrease rapidly when 5⩽x⩽8; no martensitic transformation was observed in the alloys with 9⩽x⩽10. The magnetic properties of these alloys are very sensitive to their chemical composition. The austenite in the alloys with 0⩽x⩽4 shows paramagnetic behavior and the martensite exhibits paramagnetic, superparamagnetic (SPM), and superspin glass (SSG) behaviors in different temperature ranges during cooling. In contrast, the austenite in the alloys with 5⩽x⩽8 is paramagnetic above its Curie temperature TC and ferromagnetic below TC, and the martensite shows SPM and SSG behaviors in different temperature ranges. The austenite in the alloys with 9⩽x⩽10, which remains stable down to 10 K, shows paramagnetic and ferromagnetic behaviors above and below TC, respectively. The complete phase diagram for the Ni50−xCoxMn39Sn11 (0⩽x⩽10) alloy system, from high temperature down to 10 K, is established. A significant magnetic-field-induced decrease of martensitic transformation temperatures and almost fully reversible magnetic-field-induced structural transformation are achieved across a broad temperature range in the alloys with 5⩽x⩽8. These results are important for understanding the composition and temperature-dependent functional properties, as well as their underlying mechanisms, in the Ni–(Co)–Mn–X (X = In, Sn, Sb) multifunctional alloys.


Acta Materialia
Volume 60, Issues 13–14, August 2012, Pages 5335–5351
Magnetic properties and structural transformations in Ni–Co–Mn–Sn multifunctional alloys
D.Y. Cong, , S. Roth, L. Schultz
Leibniz Institute for Solid State and Materials Research Dresden (IFW Dresden), PO Box 270116, D-01171 Dresden, Germany
Received 18 January 2012. Revised 11 June 2012. Accepted 18 June 2012. Available online 24 July 2012.