The Preparation of Thin Conductive Polyimide Foils for Nuclear Targets.

Thin and conductive plastic foils are of great interest to the target preparation and nuclear physics communities as a backing support for neutron-induced reaction measurements. This paper describes the preparation and characterization of thin, freestanding conductive polyimide films with an areal density suitable for target preparation in nuclear chemistry applications. The films were fabricated by blending a variety of graphene-based nanoparticles, a custom-made graphene suspension, and carbon nanotubes within a polymer matrix.

Application of Sublimation in the Synthesis and Crystal Growth of Organosulfones.

The solvent-free elimination of sulfinic acid and aromatization of 1,6-trans-substituted bis(arylsulfone) trienes is reported. It is shown that sublimation can be used as a 'green' method to combine the thermal transformation of six trienes and the crystal growth of the resulting 4-(phenylsulfonyl)biphenyls. When the sublimation conditions are carefully controlled, high quality single crystals of the 4-(phenylsulfonyl)biphenyls are obtained.

Bulky end-capped [1]benzothieno[3,2-b]benzothiophenes: reaching high-mobility organic semiconductors by fine tuning of the crystalline solid-state order.

A series of bulky end-capped [1]benzothieno[3,2-b]benzothiophenes (BTBTs) are developed in order to tune the packing structure via terminal substitution. A coupled theoretical and experimental study allows us to identify 2,7-di-tert-butylBTBT as a new high-performance organic semiconductor with large and well-balanced transfer integrals, as evidenced by quantum-chemical calculations. Single-crystal field-effect transistors show a remarkable average saturation mobility of 7.

Substrate-induced phase of a [1]benzothieno[3,2-b]benzothiophene derivative and phase evolution by aging and solvent vapor annealing.

Substrate-induced phases (SIPs) are polymorphic phases that are found in thin films of a material and are different from the single crystal or "bulk" structure of a material. In this work, we investigate the presence of a SIP in the family of [1]benzothieno[3,2-b]benzothiophene (BTBT) organic semiconductors and the effect of aging and solvent vapor annealing on the film structure. Through extensive X-ray structural investigations of spin coated films, we find a SIP with a significantly different structure to that found in single crystals of the same material forms; the SIP has a herringbone motif while single crystals display layered π-π stacking.

High Mobility in Solution-Processed 2,7-Dialkyl-[1]benzothieno[3,2-b][1]benzothiophene-Based Field-Effect Transistors Prepared with a Simplified Deposition Method.

A high performing solution-processed field-effect transistors based on 2,7-didodecyl[1]benzothieno[3,2-b][1]benzothiophene (C12-BTBT) has been fabricated by using a simple and straightforward two-step process. We have demonstrated that UV/ozone treatment of the Si/SiO substrates makes it possible to notably enhance the field-effect mobility in spin-coated C12-BTBT based OFETs reaching values as high as 2.7 cm  V  s .

Synthesis of 1,6-, 2,7-, 3,8-, and 4,9-isomers of didodecyl[1]benzothieno[3,2-b][1]benzothiophenes.

The synthesis of 1,6-, 2,7-, 3,8-, and 4,9-isomers of dibromo- and didodecyl[1]benzothieno[3,2-b][1]benzothiophenes, via the stilbene pathway, is described. Starting from the synthesis of bromo-2-(methylthio)benzaldehydes, a series of functionalization, McMurry coupling, and finalising cyclization reactions were explored. The stereochemistry of the cyclization mechanism was investigated.

17β-Hy-droxy-17α-methyl-androsta-1,4-dien-3-one.

The title compound, C20H28O2, is a steroid with strong anabolic properties. The present solvent-free form crystallizes with two mol-ecules per asymmetric unit. In the crystal, both mol-ecules are involved in the formation of O-H⋯O hydrogen-bonded chains which extend along the b-axis direction.

Ethyl N-[2-(4-phen-oxy-phen-oxy)eth-yl]carbamate.

The title compound, C(17)H(19)NO(4), which is a non-toxic insect growth regulator with the common name fenoxycarb, contains two independent and conformationally different mol-ecules in the asymmetric unit. Although the inter-ring dihedral angles are similar [62.21 (15) and 63.