Charge-transfer and non-charge-transfer crystal forms of (E)-5,5′-dimesitylbifuranylidenediones : an X-ray structural investigation
Abstract
Synthesis of compounds of type (1) is briefly considered : X-ray study shows the dimesityl representative (2) to exist in a self charge-transfer form as very dark blue-black needles having a metallic lustre, and in a scarlet non-CT form; the preparation and interconversion of the forms is mentioned.