Chalcopyrite has a tetragonal crystal structure (space group I42d ) and the composition CuFeS2; answer to Guess the Mineral

Chalcopyrite

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Angewandte Chemie 48/2014: Unexpected Synergy
Overview of the latest issue of Angewandte Chemie

Click On, Click Off
Palladium(II) pyridine-2,6-carboxamide "click" molecular switches are acid/base responsive

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Chemistry: Interdisciplinary and International – and with a Sense of History
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![Bistable [2]Rotaxane with Switchable Fluorescence](https://www.chemistryviews.org/wp-content/uploads/legacy/common/images/thumbnails/source/1497a87e72c.jpg)
Bistable [2]Rotaxane with Switchable Fluorescence
Researchers construct [2]rotaxane with stimuli-responsive on/off fluorescence

Catalyzing Hydrogenations without Metal
Graphenes can be used as carbocatalysts for the hydrogenation of alkenes and acetylene without the need for metals

Angewandte Chemie 47/2014: Molecular Machinery
Overview of the latest issue of Angewandte Chemie