A new method for synthesizing (/z-C6H13)3SiO(SiPcO)2Si(n-C6H13)3 and methods for isolating («-C6H13)3SiO(SiPcO)3Si(n-C6H13)3 and (n-C6H13)3SiO(SiPcO)4Si(n-C6H13)3 from a mixture containing these two oligomers are described. Well-resolved NMR spectra of the three oligomers and of (n-C6H13)3SiOSiPcOSi(n-C6H13)3 are presented. Electrochemical studies of the series (n-C6H13)3SiO(SiPcO)"Si(«-C6H13)3 ( = 1-4) show n one-electron oxidation and n one-electron reduction waves and give evidence
Aspartic acid (I), when heated to a temperature in excess of 180 °C, undergoes a solid‐state condensation polymerization to afford the useful polymeric intermediate known as poly(succinimide) (II). Treatment of poly(succinimide) with aqueous base, such as sodium hydroxide, affords sodium poly(α,β‐DL‐aspartate) (III) also known as thermal poly(aspartate) (TPA). Acid catalysts, such as phosphoric acid have been added to the aspartic acid to afford higher‐molecular‐weight poly(succinimide) than is obtained in the non‐catalyzed polymerization. Recently, new sulfur‐based catalysts have been disclosed for the polymerization of aspartic acid. The sulfur‐containing catalysts provide a route to highly biodegradable, low‐color poly(aspartate)s in the molecular weight range of 2 000 to 20 000. A comparison of biodegradability, molecular weight, and spectral characteristics of the poly(succinimide)s and poly(aspartate)s derived from the catalyzed and non‐catalyzed polymerizations is presented.
This paper describes the synthesis of the novel amphiphilic two-ring phthalocyanine (HO)GePcO-SiPc(OSi(n-C6H13)3) (where Pc is the phthalocyaninato dianion), the formation of a monolayer of this compound in which the rings are parallel to the plane of the monolayer, and some properties of this monolayer. The paper also describes the preparation by the Langmuir-Blodgett technique of multilayers of the compound in which the rings appear to be parallel to the substrate plane and the fabrication and properties of metal-insulator^metal devices constructed of aluminum electrodes and films of the compound of varying thicknesses. It is shown that the phase-change pressure of the monolayer is 17 mN/m and thus is sufficiently high to facilitate its deposition on a solid substrate. It is estimated that the relative permittivity of the multilayers is 5.5 ± 0.2 and thus is consistent with the permittivities reported for multilayers of porphyrins. The monolayer and multilayers are representatives of a new class of dielectric films. They are almost certainly highly anisotropic and have the potential to be used in a molecular engineering capability as components for complex microelectronic devices. edged.Registry No. (HO)GePcOSiPc(OSi(n-C6H13)3), 115461-96-6.
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