Chapter 5 - The Halides of Molybdenum
About: This article is published in Studies in Inorganic Chemistry.The article was published on 1994-01-01. It has received 2 citations till now. The article focuses on the topics: Molybdenum & Halide.
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21 May 2020
TL;DR: In this article, the authors present a survey of the Molybdenum chemistry and its application in various areas of industry, such as mining, automotive, agriculture, and economic aspects.
Abstract: The article contains sections titled:
1. Introduction
2. Properties
3. Occurrence
3.1. Minerals
3.2. Deposits
4. Production
4.1. Concentration
4.2. Processing of Concentrate
4.3. Recovery from Spent Petroleum Catalysts
4.4. Recovery during Production of Tungsten Ores
4.5. Production of Molybdenum Metal Powder
4.6. Production of Compact Molybdenum Metal
4.7. Processing of Molybdenum
4.8. Molybdenum-Base Alloys
5. Uses
6. Production of Ferromolybdenum
6.1. Ferromolybdenum Grades
6.2. Raw Materials
6.3. Submerged Arc Furnace Carbothermic Reduction
6.4. Metallothermic Reduction
7. Molybdenum Compounds
7.1. Overview of Molybdenum Chemistry
7.2. Molybdenum Oxides
7.3. Molybdenum Chalcogenides
7.4. Molybdenum Halides
7.5. Molybdates, Isopolymolybdates, and Heteropolymolybdates
7.6. Other Molybdenum Compounds
8. Uses of Molybdenum Compounds
8.1. Catalysis
8.2. Lubrication
8.3. Corrosion Inhibition
8.4. Flame Retardancy and Smoke Suppression
8.5. Pigments
8.6. Agriculture
9. Analysis
10. Economic Aspects
11. Environmental Aspects
12. Toxicology and Occupational Health
35 citations
10 Oct 2017
TL;DR: In this paper, the basic properties of molybdenum and the methods of producing metallic molybordenum are described, and the focus is directed to various applications of the molybenzenum alloys and compounds such as catalysts, lubricants and refractory ceramics.
Abstract: The basic properties of molybdenum and subsequently the methods of producing metallic molybdenum are described. Selected classes of important inorganic compounds (molybdenum halides, molybdenum oxides, iso- and hetero-polyoxomolybdates) as well as molybdenum hexacarbonyl and hybrid inorganic–organic materials are presented. Thereafter the focus is directed to various applications of metallic molybdenum, its alloys and compounds such as catalysts, lubricants and refractory ceramics. In conclusion, molybdenum’s medicinal role and the antimicrobial activity of MoO3 and solid solutions Mo
n
W1-n
O3 are discussed.
22 citations
References
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TL;DR: Trans-[MoCl2(PMe2Ph)4] as discussed by the authors is a low-valent phosphine compound that can be synthesized by reduction of MoCl5 with Mg in the presence of PMe2Ph in tetrahydrofuran.
Abstract: The compoundtrans-[MoCl2(PMe2Ph)4] has been prepared by the reduction of MoCl5 (by Mg) or of [MoCl3(PMe2Ph)3] (by LiBun) in the presence of PMe2Ph in tetrahydrofuran (THF). It has μeff=2.84 B.M. and crystallises in space group P1 witha=11.591(3),b=12.931(3),c=12.703(3) A, α= 95.28(2), β=105.97(2), γ=103.54(2)°. Refinement of the structure gave R=0.036. The Mo-Cl and Mo-P distances average 2.443(6) and 2.534(8) A, respectively. Low-valent phosphine complexes of the Group VI metals continue to attract much attention because of their involvement in studies of the catalytic activation of dinitrogen(1), dihydrogen(2, 3), alkenes and alkynes(4). As a by-product during our studies of dinitrogen(1) and hydride(2) complexes of molybdenum and tungsten, we obtainedtrans-[MoCl2- (PMe2Ph)4] as yellow, paramagnetic crystals (μeff= 2.84 B.M.). We first obtained the compound during the attempted synthesis ofcis-[Mo(N2)2(PMe2Ph)4] by reduction of MoCl5 with Mg in the presence of PMe2Ph (see Experimental). Upon identification of the compound we found that it could be readily synthesised by treatment of [MoCl3(PMe2Ph)3](5) with LiBun in THF in the presence of PMe2Ph (experimental). The complex was shown to have thetrans structure by x-ray analysis (Figure). Analogues oftrans-[MoCl2(PMe2Ph)4] have been prepared, namely [CrCl2(Me2PCH2CH2PMe2)2](6),trans- [MoCl2(PMe3)4](7), [WCl2(PMe2Ph)4](8) and [WCl2(PMe3)4](4), of which onlytrans-[MoCl2(PMe3)4] has been examined by X-rays(7). Its principal structural parametersi.e. d(Mo-Cl)= 2.420(6), d(Mo-P)av=2.496(3) A(6) are close to those found here fortrans-[MoCl2(PMe2Ph)4].
5 citations
TL;DR: In this paper, the reactions of a mixture of 2-pentene/toluene in the presence of Tungsten and Molybdenum-containing Ziegler-Natta-Catalysts were studied.
Abstract: Reactions of Alkenes in the Presence of Tungsten- and Molybdenum-containing Ziegler-Natta-Catalysts
In connection with investigations of reactions of alkenes under the conditions of metathesis we studied the reactions of a mixture of 2-pentene/toluene in presence of the catalytic systems WCl6/EtAlCl2 and MoCl5/EtAlCl2 in homogeneous liquid phase.
Alkylation of toluene, metathesis of 2-pentene and also indirect isomerisation of double bonds have been determined in dependence of the molar proportions of 2-pentene/MeClx, toluene/2-pentene, and MeClx/EtAlCl2, the addition order (“formation”) of reactants, the “building time” of catalytic system and the reaction time.
Compositions of the reaction mixtures have been determined by GLC.
4 citations
TL;DR: In this paper, the SCF-Xα-SW method in an overlapping atomic spheres approximation has been used to calculate the electronic structure, ionization potentials, energies and oscillator strengths of the allowed optical transitions and also some of the one-electron properties of the MoO2Cl2 molecule.
Abstract: The SCF-Xα-SW method in an overlapping atomic spheres approximation has been used to calculate the electronic structure, ionization potentials, energies and oscillator strengths of the allowed optical transitions and also some of the one-electron properties of the MoO2Cl2 molecule. The electronic absorption spectra of vapours over molybdenum and tungsten dioxodibromides have been measured. Interpretation of the experimental electronic absorption spectra of the MoO2Cl2, MoO2Br2 and WO2Br2 molecules is discussed.
4 citations
4 citations
4 citations