ハロゲン化銀に吸着した増感色素の結晶構造

(2) 臭化銀及び塩化銀に吸着したソアニン色素

抄録

Adsorbed structure of cyanine bromide and cyanine chloride sensitizing dyes on silver bromide and silver chloride single crystals made from melt is studied by electron diffraction method. The dyes are adsorbed in multimolecular layer from alcohol or aquous solutions by vaporization method.
The dyes have proper side spacings determined likely by their thickness and adsorption angle to the substrate, and the adsorption becomes regular if the dye side spacing and the spacing of atomic row in the substrate crystal surface are equal. If the adsorption activity of the crystal surface is strong, the dye side spacing can be somewhat modified, but if it is weak, the orientation becomes fiberous, and if still weaker, the orientation will be random.
The dye lb on silver bromide has a proper side spacing of about 6 Å, and is regularly adsorbed by atomic row spacing of 5.75 Å of the substrate, therefore the dye having thickness, of about 3.5 Å is adsorbed with an angle of about 40° to the substrate.
The dye XXIb has a proper side spacing of about 4 Å, and is regularly adsorbed by atomic row spacing of 4.06 Å, with an angle of about 60°.
The dye VIIIc on silver chloride has a proper side spacing of about 4.3 Å, and shows either fiberous orientation or self crystal structure.