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Piperidine absorbs CO2 and H2O contents in air to form a molecular complex: piperidium-1-piperidinecarboxylate-H2O. The structure of the complex was characterized by FT-IR and NMR. The complex is stabilized via five hydrogen bonds between the three components, N…O electrostatic interaction and O…O interaction (electron transfer) between1-piperidinecarboxylate and H2O. Through electron transfer from the carbamate ion, the oxy- gen atom in water molecule is strongly negatively charged and the O—H bond is considerably shorter than that of free water mole- cule. The formation of the molecular complex is a reversible process and will decompose upon heating. The mechanism of formation and stabilization is further investigated herein.
Piperidine absorbs CO2 and H2O contents in air to form a molecular complex: piperidium-1-piperidinecarboxylate-H2O. The structure of the complex was characterized by FT-IR and NMR. The complex is stabilized via five hydrogen bonds between the three components, N ... O electrostatic interaction and O ... O interaction (electron transfer) between1-piperidinecarboxylate and H2O. Through electron transfer from the carbamate ion, the oxy- gen atom in water molecule is strongly negatively charged and the O-H bond isvious shorter than that that of free water mole- cule. The formation of the molecular complex is a reversible process and will decompose upon heating. The mechanism of formation and stabilization is further reviewed herein.