Masahisa Kobayashi

Synthesis and Properties of Surface-Active Compounds Containing Silicon Atoms. I.

Among the surface-active compounds containing silicon atoms in the hydrophobic group being widely studied recently, methylsiloxane-oxyalkylene copolymers are reported to have very exellent surface activity. But study on surfactants containing polysilmethylene group has never been reported yet. The authors synthesized such compounds and investigated their physical properties to examine the difference of property between silicon-oxgen bond and silicon-carbon bond and the effect of substitution of carbons in the alkyl chain by silicons.Syntheses were carried out as follow;4, 4, 6, 6-Tetramethyl-4, 6-disilheptanol was prepeard by the reaction of ethylene oxide with the Grignard reagent of 4, 4, 6, 6-tetramethyl-4, 6-disilpentyl chloride obtained by the reaction of trimethylsilylmethyl lithium with chloromethyl-dimethylchlorosilane.Ethyleneoxide-adducts of this disilheptanol were obtained by the usual addition reaction with potassium hydroxide catalyst.Surface tension, wetting power, dispersing power on carbon black in benzene and foaming power of the aqueous solution of the adducts were determined, and it was found that some gave low surface tention at 0.1% and 1.0% solution and good foaming power.But dispersing power on carbon black in benzene and wetting ability to polyvinyl chloride were less.These silmethylene-type compounds were inferior to siloxane-type compound in lowering surface tension and wetting power.In conclusion, siloxane bond is more efficient in lowering surface energy than silmethylene bond, and the effect of substitution of only two carbons in the alkyl chain by silicons is not evident.

Analysis of the Absorption Bands in Organic Compounds. III

(1)〓C=O基の發色電子が單振動を行うものと假定してそのforce constantsを決定し, kx=87.7×103dyne/cm, kz=137.2×103 dyne/cmなる値を得た。 (2)〓C=O基を含む主なる脂肪族化合物に就てその吸收帶の位置を計算し,實測値とよく一致する事を確めた。

Absorption Bands of Metallic Comp_??_exes. XII

KCr(SO4)2・12H2O, [Cr(H2O)6]Cl3, [Co(NH3)4H2OCl(1) (2)]SO4, [Co(NH3)6]Cl3等の溶液及び結晶の吸收を測定した.クロム明礬の水溶液及び結晶に於る第三吸收帶, [Co(NH3)4H2OCl]SO4及び[Co(NH3)6]Cl3の結晶に於る第三吸收帶は配位子の解離に基因する.クロム明礬結晶の低温に於る變色及び[Cr(H2O)6]Cl3溶液の温度に依る吸收變化は配位子解離の強弱に因る.配位子解離と複圏錯鹽生成機構との關係を論じた.

Absorption Spectra of Solid Substances

固體吸收スペクトルの測定方法として,單一結晶法,顯微鏡法,及び反射法の三種を述べ,それぞれ,大なる結晶の得られる場合,微細結晶のみ得られる場合,及び無定形な状態でしか得られぬ場合,に應じて適用し得られることを示し,實験例として,クローム明礬, [Co(NH3)4Cl2(1)(2)]Cl, [Co(NH3)4CO3]Cl, [Co(NH3)4CO3]NO31/2H2O, [Co(NH3)4CO3]2SO43H2O, ZnS, C4〓S, HgS (辰砂)の吸收曲線を報告せり.