Studies on TMPD:TCNB; a Donor-Acceptor with Room Temperature Paramagnetism and n-π Interaction†

Abstract

A donor-acceptor compound based on N, N,N′,2,4, has been synthesized. The crystal structure of the black 1:1 complex formed between TMPD and TCNB has been determined by single crystal X-ray diffraction at room temperature. The compound crystallizes in the triclinic space group P-1 with cell dimensions: a = 7.4986(15) Å, b = 7.6772(11) Å, c = 8.0764(15) Å, α = 78.822(12)°, β = 83.3779(19)°, γ = 86.289(17)°. TMPD and TCNB molecules are stacked alternately in infinite columns along the a-axis.The structure does not seem to show the usual π-π interaction between the two aromatic rings, but indicates an n-π interaction localized between the nitrogen atoms of the donor and the cyano groups of the acceptor.

Highly conducting Wurster-type twisted covalent organic frameworks

“…27 The doping of this motif through oxidation is a well-studied feature, and the hereby generated radical cations show promising stability as conductive organic materials for charge transport or storage. [28][29][30] Organic salts based on TMPD as the electron donor and tetracyanoquinodimethane (TCNQ) as the electron acceptor show high electrical conductivities. 31 Herein, we demonstrate that the Wurster motif can be embedded into different COFs, defined by using two different linear linker molecules.…”