Schottky Device\nFabrication of Linear Dicarboxylato-Bridged\nMn(II) and Co(II) Coordination Polymers: Experimental and Theoretical\nInsights

In this study, we report the syntheses of two new coordination\npolymers (CPs) of Mn(II) and Co(II), [Mn(4-avp)<sub>2</sub>(adc)(H<sub>2</sub>O)]·(solvent)<sub><i>x</i></sub> (<b>1</b>) and [Co(4-avp)<sub>2</sub>(adc)(CH<sub>3</sub>OH)<sub>2</sub>]\n(<b>2</b>), respectively, using relatively less explored linear\nlinker acetylenedicarboxylic acid (H<sub>2</sub>adc) and polyaromatic\nhydrocarbon (PAH)–based monodentate <i>N</i>-donor\nligand 4-[2-(9-anthryl)vinyl]pyridine (4-avp). CP<b>1</b> creates\na two-dimensional (2D) structure in this instance, while CP<b>2</b> is made up of a 1D chain polymer. It is of interest that CP<b>1</b> and CP<b>2</b> exhibit semiconducting behavior and\nbehave as Schottky barrier diodes. However, CP<b>1</b> exhibits\nhigher conductivity and better Schottky diode formation when compared\nto CP<b>2</b>, which relates to the charge transportation through\nspace via π···π interactions present in\nCP<b>1</b>. The experimental results are well validated by theoretical\ndensity functional theory (DFT) prediction based on band gap and density-of-state\n(DOS) calculations. It is noteworthy that fabrication of Mn/Co-based\nSchottky devices appears to be inadequate in the literature. Thus,\nthis work showcases a new direction for the development of electronic\ndevice fabrication.