SnIP is the first atomic-scale double helical semiconductor featuring a 1.86 eV bandgap, high structural and mechanical flexibility, and reasonable thermal stability up to 600 K. It is accessible on a gram scale and consists of a racemic mixture of right- and left-handed double helices composed by [SnI] and [P] helices. SnIP nanorods <20 nm in diameter can be accessed mechanically and chemically within minutes.

Fibrous phosphorus is one of the known crystalline allotropes under standard pressure conditions. It has been predicted prior to its successful synthesis and structural characterization. The allotrope consists of parallel, tubular double strands of phosphorus, in contrast to the violet form of Hittorf's phosphorus, where the same strands are arranged in a perpendicular orientation towards each other. This structural similarity results in an almost identical energetic stability * Prof. Dr. T. Nilges

The application of the EnPhaSyn (theoretical Energy diagrams, experimental Phase formation, Synthesis and characterisation) concept is reviewed with respect to prediction of structures and stability of element allotropes and compound polymorphs, their phase formation and transition processes, and their directed synthesis, respectively. Therein, the relative energetical stability (En) of target compounds and possible decomposition are determined from quantum chemical DFT calculations. Phase formation and transition (Pha) is probed by a gas balance method, developed as high temperature gas balance concept. It helped to study the synthesis and stability range of several compounds experimentally. Applications of the concept and synthesis principles (Syn) of non-equilibrium phases are presented for allotropes of P, As, P

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2D 31 P Solid State NMR Spectroscopy, Electronic Structure and Thermochemistry of PbP 7. -Phase pure polycrystalline PbP7 is prepared by solid state reaction of a 1:1 mixture of the elements using Pb as a flux (evacuated quartz tubes, 673 K, 6 d; 90-95% yield based on P). The compound crystallizes in the space group P2 1/c and is composed of a complex 3D polyphosphide network with Pb filling the cages. The P substructure consists of trans-edge-shared P 6 hexagons forming strands. The assignment of the previously published 31 P solid state NMR spectrum to the seven distinct crystallographic sites is accomplished by r.f. driven dipolar recoupling (RFDR) experiments showing no obvious correlation between the 31 P chemical shift and structural parameters. PbP 7 decomposes incongruently. The thermal decomposition starts at 550 K with a vapor pressure almost similar to that of red P. Electronic structure calculations reveal that PbP 7 is a semiconductor according to the Zintl description and exhibits stereo-active Pb 6s 2 lone pairs. -(BENNDORF, C.; HOHMANN, A.; SCHMIDT, P.; ECKERT*, H.; JOHRENDT, D.; SCHAEFER, K.; POETTGEN, R.; J. Solid State Chem. 235 (2016) 139-144, http://dx.