The water-triggered reversible transformation plays a significant role in bio-systems. To develop artificial materials with reversible structural transformability under mild conditions would be helpful to understand how bio-systems work. Here we report on a flexible coordination polymer, Cu-(Gly-Thr)·2H2O, whose structure can be controlled by humidity or temperature. This porous coordination polymer shows reversible single-crystal to single-crystal transformation with surprisingly high thermal stability. It was found that the ordered transformation occurs via coordination bonds breaking and reforming without changing the coordination numbers and valence of the copper ion. This reversible transformation makes it especially efficient at taking up CO2 under wet conditions, which is similar to the function of plant stomata.
Thermodynamic characteristics of protolytic equilibria in aqueous solutions of glycyl peptides
Protolytic equilibria in aqueous solutions of glycyl-DL-serine, glycyl-DL-threonine, and glycyl-DL-valine are investigated by means of potentiometry and calorimetry. Dissociation constants and heat effects of the above dipeptides are determined. Standard
Gridchin
p. 2170 - 2176
(2016/10/24)
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