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Publicatii proprii
High spin to low spin change induced by reductive chemistry with iron-substituted Dawson polyoxometalate
Chemical reduction of an iron(III) substituted Dawson 5-molybdo-12-tungsto-2-phosphate a2-K7[Fe(H2O)P2Mo5W12O61]·17H2O complex, with dithionite in aqueous solution is reported alongside with similar data for the monolacunary Dawson molybdo-tungsto diphosphates a2-[P2Mo5W12O61]10-. UV-vis absorption and lowtemperature EPR (electron paramagnetic resonance) spectra indicate several distinct species and an unprecedented change of spin state at the ferric
Read moreClay mineral variations in Holocene terrestrial sediments from the Indus Basin
We employed X-ray diffraction methods to quantify clay mineral assemblages in the Indus Delta and flood plains since ~ 14 ka, spanning a period of strong climatic change. Assemblages are dominated by smectite and illite, with minor chlorite and kaolinite. Delta sediments integrate clays from across the basin and show increasing smectite input between 13 and 7.5 ka, indicating stronger chemical weathering as the summer monsoon intensified. Changes
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