Microcalorimetric in situ synthesis and the solid-state reaction enthalpy change for 1D Co^II coordination polymer

Abstract

One cobalt (II) coordination polymer, named as [Co(3,3′-BDA)(H₂O)₂]_n (3,3′-H₂BDA is 3,3′-dicarboxyl-2,2′-bipyridine), has been synthesized under a simulated condition using an RD496-2000-type microcalorimeter. X-ray single-crystal structural analysis shows complex 1 is a one-dimensional chain-like structural feature and the same as the reported complex prepared under hydrothermal conditions. The hydrothermal processes of 1 were simulated by microcalorimetry in situ, and the different simulated keeping temperatures at 353.15 K, 393.15 K, 413.15 K, 433.15 K were adopted to verify the effect of temperature on the formation of 1. The results show that complex 1 has been formed when the reactants are mixed and reacted at room temperature, and the synthesis processes under different keeping temperatures contributed to the formation of its crystals. The solid-state reaction enthalpy change $\Delta _{{\text{r}}} H_{{\text{m}}}^{{{\theta }}} ({\text{s}})$ was calculated as 59.01 ± 0.35 kJ·mol⁻¹ at 298.15 K.

Graphical abstract

One 1D cobalt (II) coordination polymer was been gained under a simulated condition using an RD496-2000-type microcalorimeter. The synthesis processes of 1 were simulated by calorimetry in situ under four different simulated keeping temperatures to verify the effect of temperature on its formation. The results show that complex 1 has been formed at room temperature, and the hydrothermal processes under different keeping temperatures might be contributed to the formation of its crystals. The solid-state reaction enthalpy change was obtained.