(Perylene)(3)-(TCNQF(1))(2): Yet Another Member in the Series of Perylene-TCNQF(x) Polymorphic Charge Transfer Crystals

The 3:2 Charge Transfer (CT) co-crystal (Perylene)(3)(TCNQF(1))(2) is grown by the Physical Vapor Transport (PVT) method, and characterized structurally and spectroscopically. Infrared analysis of the charge sensitive modes reveals a low degree of charge transfer (less than 0.1) between donor and acceptor molecules. The crystal is isostructural to the other 3:2 CT crystals formed by Perylene with TCNQF(2) and TCNQF(4), whereas such stoichiometry and packing is not known for the CT crystals with non-fluorinated TCNQ. The analysis of the isostructural family of 3:2 Perylene-TCNQF(x) (x = 1,2,4) co-crystal put in evidence the role of weak F (horizontal ellipsis) HC bonding in stabilizing this type of structure