There could be a coordination bond between the silver atom and the hydroxyl group of tannic acid, which stabilize the Ag nanoparticles in the spatial reticulate structure of tannic acid.
纳米银颗粒与羟基发生电荷吸附作用，固定在鞣酸的空间网状结构中，稳定存在。
2
The crystal structure has been determined by X ray single crystal diffraction, showing a distorted trigonal bipyramidal configuration with five coordination for the central tin atom.
Results of analysis with IR and ESCA showed that ring -shaped conjugated structures exist in the films. Copper atom may be linked to the polymer either by covalent bond or coordination bond.