Synthesis and Characterization of New Diruthenium (II, III) Compounds for Metal-molecule-silicon Devices

Iuliia Savchenko, Purdue University

Abstract

For the past three decades, Complementary Metal-Oxide Semiconductor (CMOS), the heart of microelectronics technology, has kept scaling down with thinner gate oxides and shorter channel lengths to accomplish the goals of high speed, low power, and high density for integrated circuits. Considering the limitations on the miniaturization of silicon based devices, the functionalization of the semiconductor surfaces with molecules is of great promise and value. Our focus is on preparation of inorganic species with inherent rich redox characteristics and its incorporation onto semiconductor surfaces. It will be discussed the synthesis and characterization (via HR-MS, NMR, voltammetry, UV-Vis spectroscopy, and X-ray crystallography) a series of unsymmetrical trans-Ru 2(ap)4 species with terminal alkyne, thiol, or phosphonate capping groups, where (ap) is 2-anilinopyridinate. The species with terminal phosphonate were prepared for the purpose of SiO 2 substrate modification with further charge transfer studies in a metal-molecule-semiconductor (MMS) junction and employment in hybrid molecular devices. The methodology of Ru2 species incorporation into Si (111) surfaces will be also described. Techniques such as transmittance FTIR, XPS, ellipsometry and cyclic voltammetry were used for characterization of the physical, electronic and chemical structure of the formed monolayer. Furthermore, it will be discussed the synthesis and structural study of Ru2(DmAniF)3(μ-O 2C(CH2)nCH=CH2)Cl (n = 3, 4, and 8; DmAniF is N,N'-di(m-methoxyphenyl)formamidine) and cis-Ru 2(DmAniF)2(μ-O2C(CH2)nCH=CH 2)2Cl (n = 3 and 8). This work expands an approach of applying olefin metathesis in inorganic chemistry via ring closing metathesis (RCM) type reactions of Ru2 compounds bearing two carboxylate ligands.

Degree

Ph.D.

Advisors

Ren, Purdue University.

Subject Area

Chemistry

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