The [TPnA][Co(dca)3] crystal was heated at 10 °C min -1 to 260 °C, then cooled under an Argon atmosphere (flow rate 50 ml min -1 ) to -80 °C at ca. 5 °C min -1 . The semi-solid (viscous) melt formed after was kept for 72 hours at room temperature to get densified (Note: Solidification of the viscous sample at room temperature might result in partial recrystallization and so