Three organic-inorganic polyoxoniobate-based compounds modified with Cu(II) amine complexes: synthesis, characterization, and catalytic studies for oxidation of styrene.

Three novel organic-inorganic polyoxoniobate-based compounds modified with Cu(II) amine complexes were synthesized under hydrothermal conditions with the chemical formulas as follows: K[Cu(enMe)][KSiNbO(VO)](OH)·9HO (1), K[Cu(enMe)][KHPNbO(VO)]·12.5HO (2), and K[Cu(enMe)][KHVNbO(VO)]·12.5HO (3) (enMe = 1,2-diaminopropane).

Six polyoxotungstate-based transition metal compounds for electrochemical capacitor application and a comparative analysis of factors affecting capacitances.

Six different polyoxotungstate-based transition metal complexes were synthesized, namely [Cu(2,2'-bpy)(μ-Cl)(PO)(HO)][HPWO]·2HO (1), [Cu(2,2'-bpy)(inic)(HO)][HPWO]·16.25HO (2), [Cu(2,2'-bpy)][SiWO]·10HO (3), [Zn(phen)][PWWVI11O]·5HO (4), [Zn(phen)(HO)][SiWO]·2HO (5), and [Zn(2,2'-bpy)][SiWO] (6) (2,2'-bpy = 2,2'-bipyridine, inic = isonicotinic acid, phen = 1,10-phenanthroline). Compound 1 is based on [HPWO] anions, which are accommodated within the open channels of a supramolecular network formed by novel Cu-P-Cl coordination clusters.

Time trends of polybrominated diphenyl ethers in sediment cores from the Pearl River Estuary, South China.

The present study provides information on the time trend of PBDEs in three sediment cores from the Pearl River Estuary (PRE), South China, using 210Pb dating technique. The sigmaPBDEs (except for BDE 209) concentrations in all sediment cores increased gradually from the bottom (mid-1970s) to the middle layer (later 1980s and early 1990s) followed by different temporal trends in different locations to the surface sediments, reflecting the variations in the consumption of commercial penta-BDEs mixture in different regions of the Pearl River Delta. The BDE 209 concentrations remained constant until 1990 and thereafter increased exponentially to the present, with doubling times of 2.

[Over one hundred year sedimentary record of polycyclic aromatic hydrocarbons in the Pearl River Estuary, South China].

The western shoal of the Lingding Bay is known to be an important deposition zone of terrestrial substance in the Pearl River Estuary (PRE). In this study, the vertical variations of concentration and fluxes of polycyclic aromatic hydrocarbon (PAH) are investigated in a core from the west shoal of Lingding Bay. In combining with 210Pb-dating, the PAHs sedimentary record in the last 100 years is reconstructed.