Over the last decades, many different types of charge transfer complexes have been discussed as organic metals. The design and synthesis of the required efficient p-electron donors constitutes an active area of modern materials chemistry. An important family with these properties is based on naphtholimines, which are known to form electrically conductive salts with a variety of organic acceptor molecules such as tetracyano-p-quinodimethane (TCNQ). Since the reduction potential of transition metal complexes can be readily modified by the selection of proper ligands and ligand substitution, such complexes are favored candidates for designed syntheses. The present work is aimed toward the study of Zn-Naphtholimines-TCNQ charge transfer complexes with fractional electron transfer per formula unit. The electron transfer is an essential factor in the control of electrical conductivity. Of particular interest was the effect of ligand volume variations on the degree of charge transfer. Both IR- spectroscopy and electron paramagnetic resonance (EPR) spectroscopy were used as analytic tools. We found, that Zn[RNAFIN]₂-2TCNQ molecules are partially ionized, and that the electron delocalization is strongly affected by the chosen ligand volume.

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