cg501206f_si_002.cif (221.28 kB)
Solvent-Dependent Stoichiometry in Perylene–7,7,8,8-Tetracyanoquinodimethane Charge Transfer Compound Single Crystals
dataset
posted on 2014-12-03, 00:00 authored by Peng Hu, Lin Ma, Ke Jie Tan, Hui Jiang, Fengxia Wei, Chuhuan Yu, Katelyn P. Goetz, Oana D. Jurchescu, L. E. McNeil, Gagik
G. Gurzadyan, Christian KlocPerylene forms three binary compounds
with TCNQ. Using a physical
vapor transport (PVT) method, mixtures of P1T1 (perylene1–TCNQ1),
P2T1 (perylene2–TCNQ1), and P3T1 (perylene3–TCNQ1) crystals
can be grown simultaneously. Solution-grown crystals exhibit a stoichiometry
that depends on the solvent used and not on the initial stoichiometry
of the perylene and TCNQ: only single crystals of P1T1 were grown
from toluene, and only P3T1, from benzene. Precipitation–dissolution
theory was employed to explain this phenomenon. We found that P1T1
is less soluble than P3T1 in toluene, which resulted in its preponderant
growth from this solvent. Using the same argument, we could also explain
the growth of P3T1 from benzene. Crystallization of P2T1 from solution
was not possible. In addition, steady-state and time-resolved fluorescence
measurements indicate that the difference in solubility of TCNQ in
benzene and toluene leads to different fluorescence spectra due to
selective crystallization of P1T1 and P3T1 from toluene and benzene.