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M
Published in Philip A. Laplante, Comprehensive Dictionary of Electrical Engineering, 2018
metal 2 the second layer applied in a fabrication process. In general the nth layer of the fabrication process is called metal n. metal halide molecule formed by the reaction of metals and halogen atoms. metal-electrode semiconductor field-effect transistor (MESFET) a specific type of FET that is the dominant active (amplifying) device in GaAs MMICs. An FET is composed of three terminals called the gate, drain, and source, and a conducting "channel." In an amplifier application, the source is connected to ground, and DC bias is applied between the drain and source causing a current to flow in the channel. The current flow is controlled and "modulated" by the AC or DC voltage applied to the gate. metal-insulator-metal (MIM) capacitor a capacitor, which has a thin insulator layer between two metal electrodes. Generally, this capacitor is fabricated in semiconductor process, and this insulator layer provides high capacitance. Two extreme behaviors of a capacitor are that it will act as an open circuit to low frequencies or DC (zero frequency), and as a short frequency at a sufficiently high frequency (how high is determined by the capacitor value). Also called a thin film capacitor. metal-organic chemical vapor deposition (MOCVD or OMCVD) a material growth technique that uses metal organic molecules in an atmospheric or low pressure growth chamber and a controlled chemical reaction on a heated substrate to grow a variety of II-VI, III-V, and group IV materials with atomic layer control. Used to create material structures for a variety of electronic and
Zwitterionic π-coordination compounds of copper(I) with monosubstituted alkynes: synthesis, crystal and electronic structure of two copper(I) halide π-complexes with 4-amino-1-propargylpyridinium
Published in Journal of Coordination Chemistry, 2021
G. V. Noshchenko, B. M. Mykhalichko, V. V. Kinzhybalo
Copper(I) halides are known to be practically insoluble in water and alcohols, but soluble in concentrated aqueous or aqueous-alcohol solutions of ammonium halides, alkali metal halides or organic amine halides. The characteristic feature of these concentrated solutions is the formation of a large variety of polynuclear [CumCln](n–m)– complexes [37]. In the course of the interaction of alkynes with the concentrated solutions (e.g. under conditions of the Nieuwland’s oligomerization of acetylene), alkyne molecules form π-metalorganic compounds with these [CumCln](n–m)– anions. In our case, the appBr compound plays the role of both an ammonium halide (to increase the solubility of CuX) and an alkyne (to π-coordinate to a metal center of [CumCln](n–m)–).