Crystal growth of 50mg-class single crystals of β′-(BEDT-TTF)2ICl2 and crystal evaluation

Single crystals of β′-(BEDT-TTF)2ICl2 were grown electrochemically. In the crystal growth we used a large glass cell of which inner volume was more than 200ml. In addition, the solution was replaced by newly prepared one every two months where total period of synthesis was about one year. As a result we obtained a number of large crystals over 10mg. The weight of the largest crystal is about 50mg. The crystallinity was confirmed by X-ray topograph imaging.