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The American Academy of Arts and Sciences is pleased to announce the election of 220 new members, continuing a 230-plus year history of recognizing some of the world's most The new members are listed below. View a list of new members organized by discipline. View the press release.
A Citrobacter sp. accumulates heavy deposits of metal phosphate, derived from an enzymically liberated phosphate ligand. The cells are not subject to saturation constraints and can accumulate several times their own weight of precipitated metal. This high capacity is attributable to biomineralization; uranyl phosphate accumulates as polycrystalline HUO2PO4… (More)
Hybrid framework compounds, including both metal-organic coordination polymers and systems that contain extended inorganic connectivity (extended inorganic hybrids), have recently developed into an important new class of solid-state materials. We examine the diversity of this complex class of materials, propose a simple but systematic classification, and… (More)
First principles calculations on the hybrid perovskite CH3NH3PbI3 predict strong hydrogen-bonding which influences the structure and dynamics of the methylammonium cation and reveal its interaction with the tilting of the PbI6 octahedra. The calculated atomic coordinates are in excellent agreement with neutron diffraction results.
that it transforms from a nonmagnetic insulating phase to a magnetic metallic phase under applied pressures on the order of 10 GPa (42–45), which is in contrast to other metallic rare earth hexaborides in which the f-electrons order magnetically in the ambient ground state. Our observation of a large three-dimensional conduction electron Fermi surface… (More)
The crystal structure of solid C 60 can be understood to a good approximation using simple crystal structure arguments, based on the close packing of spheroidal molecules. The simplest variant of C 60 that can be envisaged consists of substituting one of the carbon atoms of the fullerene skeleton by an aliovalent atom to afford a C 59 A molecule. Indeed… (More)
Flexible metal-organic frameworks (MOFs) can undergo fascinating structural transitions triggered by external stimuli, such as adsorption/desorption of specific guest molecules or temperature changes. In this detailed study we investigate the potentials and limitations of tuning framework flexibility systematically by exploiting the powerful concept of… (More)