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Abstract. Bismuth nanoparticles were obtained via sequential photoinitiated synthesis and phase-transfer separation. Specifically, BiBr 3 was used as a starting material in propylene carbonate (PC) as the polar phase, which was topped by heptane (Hep) as the non-polar phase containing oleylamine (OA) as the phase-transfer agent. In a photoreactor set-up, this two-phase system was thoroughly mixed and illuminated by broad-band UV light emitted by a high-pressure Xe lamp.

The cover picture shows micrometer‐sized AgReO4 stars that were prepared by controlled nucleation and growth in tetrahydrofuran with [NMe4][ReO4] and Ag[OTf] (OTf: triflate) as the starting materials. By specific modification of the experimental conditions, moreover, nanometer‐sized AgReO4 plates and micrometer‐sized AgReO4 rods were obtained. The growth conditions as well as the analytical characterization of the AgReO4 plates, rods and stars are described. More details are discussed in the article by Lennart Brütsch and Claus Feldmann on page http://onlinelibrary.wiley.com/doi/10.1002/zaac.201700072/abstract.

AgReO 4 nanoplates and micron-sized AgReO 4 rods and stars are obtained for the first time from controlled particle growth in THF. [NBu 4 ][ReO 4 ] or [NMe 4 ][ReO 4 ] and Ag(OTf) (OTf: triflate) are used as the starting materials.The crystal growth is directed by the presence (i.e., plates) or absence (i.e., rods, stars) of trioctylphosphine (TOP) as a coordinating agent as well as by the temperature of the reaction (i.e., plates, rods in refluxing THF; stars at room temperature).