This complex of complexes shows unexpected attraction between silver and iodonium cations
Evidence has been discovered that attractive forces exist between silver and iodonium cations. ‘The interaction is counter-intuitive,’ explains Kari Rissanen from the University of Jyväskylä, Finland. ‘No one would expect two positively charged ions to experience an attractive interaction.’
Rissanen says that his team discovered the attraction serendipitously. They were studying reactions intended to produce a complex containing a positively charged halogen ion, known as a halonium ion, specifically an iodonium ion. These reactions started with one complex that contained a silver ion and another that contained an iodonium ion. The iodonium ion was intended to substitute for the silver ion, but instead the researchers produced a stable ‘complex of complexes’ without any substitution. ‘It would have been easy to dismiss the result as an oddity and move on, but we recognised its p
Quantum technologies for computers open up new concepts of preserving the privacy of input and output data of a computation. Scientists from the University of Vienna, the Singapore University of Technology and Design and the Polytechnic University of Milan have shown that optical quantum systems are not only particularly suitable for some quantum computations, but can also effectively encrypt the associated input and output data.
Green rice fields in Bali, Indonesia
Large-scale land acquisitions by foreign investors, intended to improve global food security, had little to no benefit, increasing crop production in some areas while simultaneously threatening local food security in others, according to researchers who studied their effects.
The study, published in the Proceedings of the National Academy of Sciences and led by the University of Notre Dame, combined satellite imagery with agricultural surveys as well as household dietary datasets of 160 large-scale land acquisitions across four continents between 2005 and 2015. It is the first comprehensive global analysis of the impact of the land acquisitions of its kind.
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Large-scale land acquisitions by foreign investors, intended to improve global food security, had little to no benefit, increasing crop production in some areas while simultaneously threatening local food security in others, according to Notre Dame researchers who studied their effects.