Electrocrystallisation of Highly Conductive Thia Adducts

Conductive adducts such as TTFX_n (X = halide) are more highly conductive when electrocrystallised galvanorather than potentiostatically. With the latter method, current-time behaviour is diagnostic of crystal quality, five different classes of behaviour and product being discernible. Mixed-halide TTF (I + Br)_n with n ～ 0.7 as in the monohalides, can be electrocrystallised. Electrode and cell configuration and conditions also govern crystal properties and accessibility of products. Thus, conical electrodes of 4mm diameter and 9mm height with a vertical wire as counter -electrode give the largest TTF (NO₃)_0.55 crystals

Higher temperature yields larger crystals.

Adduct compositions are sometimes governed by solvent.     

The synthesis and characterization of a poly(maleimide-ether) containing pendent thiophene rings

The preparation of a poly(maleimide-ether) containing pendent thiophene rings via the reaction of 2-(3-thienylmethyl)-1,3-N,N'-bis(3,4-dichloromaleimido) propane with 1,4-dihydroxybenzene is described. The novel 2-substituted-1,3-N,N'-bis(3,4-dichloromaleimido) propanes were obtained by allowing their corresponding diamine hydrochlorides to react with 3,4-dichloromaleic anhydride in acetic acid in the presence of sodium methoxide. The diamine hydrochlorides were prepared by the reduction of their respective diamides. The poly(maleimide-ether)s were fully characterized and ¹³C-NMR spectroscopy was used to confirm the microstructure of the materials. The properties of the thiophene substituted polymer are compared with model poly(maleimide-ether)s. Electrochemical studies indicated that the thiophene rings in the thiophene-substituted poly(maleimide-ether) were not electroactive. © 1992 John Wiley & Sons, Inc.