2002 Volume 2002 Issue 3 Pages 313-319
The states of dissolved water in various ethers such as diethyl ether (DEE), dipropyl ether (DPE), dibutyl ether (DBE) di-s-butyl ether (DSBE), dioctyl ether (DOE), didecyl ether (DDE) and ethylene glycol dibutyl ether [1,2-dibut-oxyethane (DBOE)] were studied by FT-IR spectroscopy. Also, thermal stability was examined for water clusters formed in such ethers.
The water cluster consists of [–O– · H2O], and [–O– · Cluster], the small clusters (C1 and C2) and the large clusters (LC1, LC2 and LC3). The water molecules in [–O– · H2O] interact with the oxygen atom of ether group through hydrogen bonding, and are surrounded by [–O– · Cluster]. The C1 and C2 are formed in the free volume among alkyl chains, and LC1, LC2 and LC3 exist around C1 and C2.
As the negativity on oxygen atom of ether group becomes greater with increasing alkyl-chain length of the ethers, [–O– · Cluster] becomes larger. The amount and the size of C1 and C2 are decreased with increasing alkyl-chain length of the ethers, while those of the large cluster (LC1, LC2 and LC3) are increased.
In the range from 40 °C to 80 °C, the C1 are vaporized and finally C1 disappears. LC2 and the LC3 are gradually divided into smaller clusters with increasing temperature.
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