A novel luminescent Pb(ii) - organic framework exhibiting a rapid and selective detection of trace amounts of NACs and Fe3+ with excellent recyclability.

A novel three-dimensional metal organic framework, Pb3O2L (1) (H2L = 4-(1H-tetrazol-5-yl)phenol), with a unique 3D network structure exhibits excellent luminescence and good stability in water and other organic solvents. 1 can act as a promising dual functional sensor for the detection and recognition of nitroaromatic explosives (NACs) and Fe3+ ions via fluorescence quenching with high selectivity and sensitivity in an aqueous phase. Importantly, 1 as a fluorescent sensor of Fe3+ can be simply and quickly regenerated, which represents a rare example of a reported luminescent sensor of Fe3+ ions. Furthermore, the visible colour changes in the detection process make them easy to distinguish by the naked eyes, and luminescent test plates broaden its potential application in detection of Fe3+ ions. Experimental and theoretical calculations indicate that the luminescence quenching can be attributed to an electron and resonance energy transfer between the MOF and analytes. The present study contributes to the development of MOF materials research, specifically in their application as biological and environmental fluorescent sensors.

Highly Selective and Sensitive Detection of Nitroaromatic Compounds and Metal Ions by Supramolecular Assemblies of 3,3',5,5'-Azobenzenetetracarboxylic Acid and 4,4'-Bipyridine.

A supramolecular compound, (H4L)(4,4'-bpy)2 (1) (H4L = 1,2-bis(3,5-dicarboxyphenyl)diazene oxide, 4,4'-bpy = 4,4'-bipyridine) with 2D + 2D â†’ 2D 3-fold parallel interpenetrated layer feature, has been prepared which was investigated as selective sensing material for detection of nitroaromatic compounds (NACs) and metal ions, and exhibits significant fluorescence quenching toward NACs and high selectivity for detection of Fe3+ ion. The result indicates that 1 is a promising multi-functional fluorescence probe for detecting and recognizing NACs and metal ions with high sensitivity and selectivity.

[Mapping of Sanming dominant genic male sterility gene in rice].

The mutant of "Sanming Dominant Genic Male Sterile Rice" was found from an F2 population of cross "SE2lS/Basmati370" by Sanming Institute of Agricultural Science in 2001. It has proven that the male sterility of this mutant is controlled by a dominant gene (named as SMS). By multiple backcrosses, this dominant male sterile allele was introduced into the genetic background of an indica rice cultivar Jiafuzhan (which was known as Jiabuyu). In order to map SMS, a mapping population was constructed by crossing Jiabuyu with a japonica cultivar Nipponbare and further crossing the F1 with Jiafuzhan. By bulked segregant analysis and linkage analysis using SSR and INDEL markers, SMS was mapped to a 99 kb interval between INDEL markers ZM30 and ZM9 on chromosome 8. This result will facilitate cloning of SMS.