Correlation in Structural Architecture toward Fabrication of Schottky Device with a Series of Pyrazine Appended Coordination Polymers

Energy is the center of importance for the survivability of civilization. Use of fossil fuel is going to be suspended, and renewable energy is technologically costlier. In the quest for new energy sources and to minimize fuel expenditure, the design of energy efficient devices is one of the solutions. Toward this objective, highly delocalized π-acidic N-hetreocycle pyrazine bridged Cd­(II)-based coordination polymers (CPs), [Cd­(tppz)­(adc)­(MeOH)] (1), [Cd­(tppz)­(trep)] (2), and [Cd­(tppz)­(2,6-ndc)] (3; tppz = 2,3,5,6-tetrakis­(2-pyridyl)­pyrazine) are synthesized in combination with π-accessible dicarboxylato linkers (acetylene dicarboxylic acid (H2adc), terephthalic acid (H2trep), and 2,6-naphthalene dicarboxylic acid (2,6 H2ndc)). The structures of the compounds, 1–3, have been confirmed by single-crystal X-ray diffraction measurements. Analysis of electrical property demonstrates that light irradiation enhances the conductivity and follows the order 3 > 2 > 1; compound 3 possesses the highest conductivity (1.93 × 10–3 (light), 1.12 × 10–4 S m–1 dark)), than 2 (1.80 × 10–4 (light), 1.10 × 10–4 S m–1 (dark)) and 1 (5.06 × 10–5 (light), 4.72 × 10–5 S m–1 (dark)). This light-induced electrical conductivity can pave the way toward fabrication of an active electronic device by using the discussed materials.