Spectroscopic Evidence for the Inter-Chain Charge–Transfer Interaction in Copper-bis(2,5-dimethyl-N,N′-dicyanoquinonediimine), Cu(2,5-DM-DCNQI)2

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Abstract
Polarized reflectance spectra of the single crystals of Cu(2,5-DM-DCNQI)2 and Na(2,5-DM-DCNQI)2 were measured at room temperature. The spectrum of Cu(2,5-DM-DCNQI)2 clearly indicated the inter-chain interaction through the coordinate bonds, whereas the spectrum of Na(2,5-DM-DCNQI)2 showed a typical one-dimensional feature along the stacking direction.