Hydrogen-bonded charge-transfer complexes of TTFs containing nucleobase or imidazole moiety

Novel electron-donor molecules based on tetrathiafulvalene (TTF) and imidazole skeleton with hydrogen-bonded (H-bonded) functionality 1–5 and 7–10 have been designed and synthesized. The cyclic voltammograms for TTF-based donors 1–5 exhibit two-stage one-electron reversible waves, while oligo(imidazole)s 7–10 show irreversible one. The room-temperature conductivities of their tetracyanoquinodimethane (TCNQ) complexes for 1, 2, 4, 5, 8 and 9 exhibit 0.11, 0.07, 2.3, 0.38, 0.16 and 0.10 Scm$^{-1}$, respectively, revealing high electrical conductivity than those of known charge-transfer (CT) complexes derived from organic donors with amino or hydroxyl groups and organic acceptor molecules. Key words. TTF, nucleobase, imidazole, hydrogen-bonding, charge-transfer complex, conductivity

Self-organizing super-structures formed from hydrogen-bonded biimidazolate metal complexes

Manipulation of molecular crystals formed from self-organization is one of the important methods to develop the new molecular functional materials. In particular, we look upon mutual cohesive interactions of hydrogen bonding and metal coordination as one useful tool to construct the preprogramming superstructures. In this study, five controlled superstructures of a one-dimensional linear chain—a zigzag ribbon, right-handed and left-handed helices, and a two-dimensional honeycomb sheet—-are newly created by using the neutral metal complexes with some 2,2′-biimidazolate mono-anions