Synthesis And Structure Of Group Vi Transition Metal Compounds Containing Bulky Nitrogen Donor Ligands
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Synthesis And Structure Of Group Vi Transition Metal Compounds Containing Bulky Nitrogen Donor Ligands
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Author : Harold Roger Powell
language : en
Publisher:
Release Date : 1986
Synthesis And Structure Of Group Vi Transition Metal Compounds Containing Bulky Nitrogen Donor Ligands written by Harold Roger Powell and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1986 with categories.
Transition Metal Dinitrogen Complexes
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Author : Yoshiaki Nishibayashi
language : en
Publisher: John Wiley & Sons
Release Date : 2019-05-06
Transition Metal Dinitrogen Complexes written by Yoshiaki Nishibayashi and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019-05-06 with Science categories.
A comprehensive book that explores nitrogen fixation by using transition metal-dinitrogen complexes Nitrogen fixation is one of the most prominent fields of research in chemistry. This book puts the focus on the development of catalytic ammonia formation from nitrogen gas under ambient reaction conditions that has been recently repowered by some research groups. With contributions from noted experts in the field, Transition Metal-Dinitrogen Complexes offers an important guide and comprehensive resource to the most recent research and developments on the topic of nitrogen fixation by using transition metal-dinitrogen. The book is filled with the information needed to understand the synthesis of transition metal-dinitrogen complexes and their reactivity. This important book: -Offers a resource for understanding nitrogen fixation chemistry that is essential for explosives, pharmaceuticals, dyes, and all forms of life -Includes the information needed for anyone interested in the field of nitrogen fixation by using transition metal-dinitrogen complexes -Contains state-of-the-art research on synthesis of transition metal-dinitrogen complexes and their reactivity in nitrogen fixation -Incorporates contributions from well-known specialists and experts with an editor who is an innovator in the field of dinitrogen chemistry Written for chemists and scientists with an interest in nitrogen fixation, Transition Metal-Dinitrogen Complexes is a must-have resource to the burgeoning field of nitrogen fixation by using transition metal-dinitrogen complexes.
Synthesis Structure And Reactivity Of Transition Metal Complexes Containing P O And N Donor Ligands
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Author : Vladimir F. Kuznetsov
language : en
Publisher:
Release Date : 2001
Synthesis Structure And Reactivity Of Transition Metal Complexes Containing P O And N Donor Ligands written by Vladimir F. Kuznetsov and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with Catalysis categories.
Synthesis Structures And Characterization Of Coordination Compounds With The Transition Metals Ni Ii Cu Ii Mn Ii Cr Iii Fe Iii Using Ligands Based On Iminodiacetic Acid And N Heterocycles
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Author : Maria Paula Juanico
language : en
Publisher: Cuvillier Verlag
Release Date : 2003
Synthesis Structures And Characterization Of Coordination Compounds With The Transition Metals Ni Ii Cu Ii Mn Ii Cr Iii Fe Iii Using Ligands Based On Iminodiacetic Acid And N Heterocycles written by Maria Paula Juanico and has been published by Cuvillier Verlag this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with categories.
The Synthesis And Structural Characterization Of Main Group And Transition Metal Complexes Supported By Nitrogen Based Ligands
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Author :
language : en
Publisher:
Release Date : 2001
The Synthesis And Structural Characterization Of Main Group And Transition Metal Complexes Supported By Nitrogen Based Ligands written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with categories.
Nitrogen based monodentate and bidentate chelating ligands have captured a significant interest due to their ability to coordinate to a wide variety of elements. The â-diketimine, â-ketoiminato, formamidine, pyridineselenolate, and pyrazinecarboxamide ligands have all been employed in this study to further investigate the coordination preferences among main group and transition metals. Steric and electronic properties of these ligands can easily be altered by manipulating the substituents attached, thus leading to predictable structures with potential for many useful and significant applications. Investigations have shown that temperature, solvent, and metal halide employed are all key factors in the reaction outcomes. All of the complexes obtained throughout these studies have been characterized by X-ray crystallography along with other spectroscopic techniques, including NMR, IR, UV/Vis, and M/S. â-diketiminato ligands, [{N(R)C(Me)}2C(H)] where R = Dipp, Mes, commonly referred to as nacnac, have played an important role in the synthesis of novel pnictogenium complexes. Results show that through manipulation of the halide precursor, reaction stoichiometry, and the R substituent on the nacnac both N, N'- and N, C'-metal chelated complexes can be achieved. Additionally, â-ketiminato ligands, [RN(H)(C(Me))2C(Me)=O] where R = Dipp, and [RN(H)C(Me)CHC(Me)=O] where R = C2H4NEt2, have been studied. Both ligands were investigated with a range of d and p block metal halides and alkyls in order to compare and contrast the bulky, flexible, and even multi-dentate nature of each ligand. The preferred metal geometry remains constant for products with either ligand, but the steric protection offered by the individual ligands governs the nuclearity of the products, ranging from tetrameric cages to simple adducts. The formamidinate ligand, [RN(H)C(H)NR] where R = Dipp, was employed in synthesizing several aluminum and zinc complexes. In addition to their numerous applications as cata.
Nitrogen Donor Ligands In The Coordination Chemistry Of The Rare Earth And Alkaline Earth Metals
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Author : Jelena Jenter
language : en
Publisher: Cuvillier Verlag
Release Date : 2010-05-27
Nitrogen Donor Ligands In The Coordination Chemistry Of The Rare Earth And Alkaline Earth Metals written by Jelena Jenter and has been published by Cuvillier Verlag this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010-05-27 with Science categories.
Bis(phosphinimino)methanide rare earth metal bisborohydrides, as illustrated in Scheme I, were successfully synthesized by salt metathesis reactions of [K{CH(PPh2NSiMe3)2}] with [Ln(BH4)3(THF)n] (Ln = Sc (n = 2); Ln = La, Nd, Lu (n = 3)) or in the case of yttrium by the reaction of [{(Me3SiNPPh2)2CH}YCl2]2 with NaBH4. Interestingly, the BH4- anions are ?3-coordinated in the solid state structures of 3, 4, 6 and 7, while for the scandium complex 5 two different conformational polymorphs were identified, in which either both BH4- groups are ?3-coordinated or one BH4- anion shows an ?2-coordination mode. Furthermore, complexes 3, 6 and 7 showed high activities in the ring-opening polymerization (ROP) of e-caprolactone (CL). At 0 °C, the molar mass distribution reached the narrowest values ever obtained for the ROP of CL initiated by a rare earth metal borohydride species. In collaboration with N. Meyer, rare earth metal chlorides and borohydrides of the 2,5-bis{N-(2,6-diisopropylphenyl)iminomethyl}pyrrolyl ligand were synthesized, as shown in Scheme II. The reaction of [(DIP2pyr)K] (10) with anhydrous neodymium trichloride afforded [(DIP2pyr)NdCl2(THF)]2 (12) which is dimeric in the solid state. Excitingly, the reaction of [(DIP2pyr)K] (10) with [Ln(BH4)3(THF)n] (Ln = Sc (n = 2); Ln = La, Nd, Lu (n = 3)) depends on the ionic radii of the center metals. For the larger rare earth metals lanthanum and neodymium, the expected products [(DIP2pyr)Ln(BH4)2(THF)2] (Ln = La (13), Nd (14)) were obtained; while for the smaller rare earth metals scandium and lutetium, an unusual redox reaction of a BH4- anion with one of the Schiff-base functions of the ligand was observed and the products [{DIP2pyr*-BH3}Ln(BH4)(THF)2] (Ln = Sc (15), Lu (16)) were formed (Scheme II). Moreover, the two neodymium containing complexes 12 and 14 were investigated as Ziegler-Natta catalysts for the polymerization of 1,3-butadiene to form poly-cis-1,4-butadiene, by using various cocatalyst mixtures. Very high activities and good selectivities were observed for 12. The 2,5-bis{N-(2,6-diisopropylphenyl)iminomethyl}pyrrolyl ligand was successfully introduced into the coordination chemistry of the divalent lanthanides and the alkaline earth metals. As shown in Scheme III, salt metathesis reactions of [(DIP2pyr)K] (10) with either anhydrous lanthanide diiodides or alkaline earth metal diiodides afforded the corresponding heteroleptic iodo complexes [(DIP2pyr)LnI(THF)3] (Ln = Sm (19), Eu (20), Yb (21)) or [(DIP2pyr)MI(THF)n] (M = Ca (24), Sr (22) (n = 3); Ba (23) (n = 4)). Surprisingly, all complexes 19-24 are monomeric in the solid state, independently from the ionic radii of their center metals. Instead of forming dimers, the coordination sphere of each metal center is satisfied by additionally coordinated THF molecules, which is a very rare structural motif in the chemistry of the larger divalent lanthanides and alkaline earth metals. While the (DIP2pyr)- ligands in 19-23 are ?3-coordinated in the solid state, for the calcium complex 24 an ?2-coordination mode was observed (Scheme III). Interestingly, the calcium complex 24 and the analogous ytterbium compound 21 show different structures in the solid state. In order to obtain catalytically active species, [(DIP2pyr)M{N(SiMe3)2}(THF)2] (M = Ca (25), Sr (26)) were prepared by the reaction of [(DIP2pyr)MI(THF)3] (M = Ca (24), Sr (22)) with [K{N(SiMe3)2}] (Scheme IV). Compounds 25 and 26 were investigated for the intramolecular hydroamination of aminoalkenes and one aminoalkyne. Unfortunately, both catalysts exhibit a limited reaction scope, caused by the formation of undesired side products by alkene isomerization and imine-enamine tautomerism. However, both compounds are active catalysts and show high yields and short reaction times. The highest activities were observed for the calcium complex 25 and can be compared to the results obtained with the ß-diketiminato calcium amide [{(DIPNC(Me))2CH}Ca{N(SiMe3)2}(THF)] as a catalyst. Finally, imidazolin-2-imide and cyclopentadienyl-imidazolin-2-imine rare earth metal alkyl complexes, synthesized by M. Tamm et al., were investigated for the intramolecular hydroamination of non-activated aminoalkenes and one aminoalkyne. Both compounds showed high selectivities and activities, and although they cannot compete with the metallocene analogues, the imidazolin-2-imide complexes are new and interesting examples for catalytically active post-metallocenes.
Main Group And Transition Metal Complexes Supported By Multidentate Tripodal Ligands That Feature Nitrogen Oxygen And Sulfur Donors
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Author :
language : en
Publisher:
Release Date : 2013
Main Group And Transition Metal Complexes Supported By Multidentate Tripodal Ligands That Feature Nitrogen Oxygen And Sulfur Donors written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with categories.
Chapter 5 describes two multidentate, L3X type ligands, which feature [CN3] and [CNO2] donors, namely tris(2 pyridylseleno)methane, [Tpsem]H, and bis(2-pyridonyl)(pyridin-2-yloxy)methane, [O-poBpom]H. They have been synthesized, characterized, and employed in the synthesis of zinc and cadmium complexes. Chapter 6 describes the synthesis and structural characterization of a new [Tp] ligand featuring an allyl substituent on the central boron atom, namely [allylTpBut]Li is reported. The compound reacts steadily with CH3CH2SH under 350 nm UV light via a thiol-ene click reaction. The resulting [CH3CH2S(CH2)3TpBut]Li complex can further react with metal halide. For example, the reaction of [CH3CH2S(CH2)3TpBut]Li with ZnI2 produced [CH3CH2S(CH2)3TpBut]ZnI at room temperature. This study provides a simple model on the immobilization of [Tp] metal complexes to the polymer chains with -SH terminals.
Synthesis Structure And Reactivity Of Polynuclear Group Vi Metal Complexes
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Author : David Owen Marler
language : en
Publisher:
Release Date : 1984
Synthesis Structure And Reactivity Of Polynuclear Group Vi Metal Complexes written by David Owen Marler and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1984 with Transition metal compounds categories.
Transition Metal Complexes With P N Ligands And Silylenes Synthesis And Catalytic Studies
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Author : Eva Neumann
language : en
Publisher: Cuvillier Verlag
Release Date : 2006-02-15
Transition Metal Complexes With P N Ligands And Silylenes Synthesis And Catalytic Studies written by Eva Neumann and has been published by Cuvillier Verlag this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006-02-15 with Science categories.
The term ligand [latin, ligare = bind] has its origin in coordination chemistry. It denotes a molecule that is able to bind to a metal center in most cases via one or several free electron pairs.[1] Ligands can be described by the number of electron-pair donor atoms as monodentate, bidentate, tridentate etc. ligands. The latter are also called chelating ligands [greek, chele = (crab’s) claw]. A typical classification of ligands is according to their electronic properties. They serve either as a σ-donating, σ-donating/π-accepting, or σ,π-donating/π-accepting ligands.[2] A more practical, often encountered approach is the classification of ligands according to their donor atoms, especially when larger molecules and molecules containing heteroatoms are regarded (compare 1.2). Coordination chemistry was already established in the 19th century. In 1893 Alfred Werner suggested an octahedral arrangement of ligands coordinated to a central metal ion for many compounds. This explained, for example, the appearance and reactivity of four different cobalt(III) complexes (Figure 1.1), when CoCl2 is dissolved in aqueous ammonia and then oxidized by air to the +3 oxidation state. The formulas of these complexes can be written as depicted in Figure 1.1. Werner’s work was rewarded with the Nobel prize in 1913.[3]
Synthesis Structure And Catalytic Property Of Transition Metal Complexes With Phosphorus Nitrogen And Sulfur Nitrogen Ligands
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Author : Xiaoping Chen
language : en
Publisher:
Release Date : 2002
Synthesis Structure And Catalytic Property Of Transition Metal Complexes With Phosphorus Nitrogen And Sulfur Nitrogen Ligands written by Xiaoping Chen and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with Ligands categories.
