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With the purpose of corroborating the establishment of these IHBs, the O-H stretching frequencies of the catechol moieties were analyzed, and these appear around 3700 [cm.sup.-1] in PB3 Ext and PB4 Ext.
The above results are different to data reported in other studies, in which IHBs were favored in conformation Com but not in the conformation Ext of distinct PC oligomers linked by C4[beta]-C8 interflavan bonds, among which are the PB1 and PB2 dimers, PC1 trimer, and a B-type tetramer [24, 25].
Depending on the proximity of these catechol rings, an intramolecular [pi]-[pi] stacking arrangement can be adopted leading to the formation of IHBs, which reduces the total surface of the molecule .
Both scenarios describe another common evolutionary trend--using the centralized liquidity of the IHB to centralize payments via a payment factory.
The structures of the all DHBAs presented in Figure 2 are planar and have at least one internal hydrogen bond (IHB).
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- Ihara Grubb Transformation Algorithms
- Ihara Saikaku
- Ihara's Genetically Epileptic Rat