Synthesis of Transition Metal Carbonyl Clusters with Phosphine Ligands PDF Download
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Author:
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Languages : en
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The chemistry of transition metal chalcogenide polynuclear clusters is a rapidly expanding area. The increasing interest is due to the search for structural models and precursors of extended inorganic solids with novel electronic, magnetic and optical properties. Our interest for the synthesis of a variety of transition - etal clusters is due to their use as a model and precursors for materials and catalyst. Synthesis and study of a variety of ligand substituted iron carbonyl cluster has been carried out to understand the reactivity features and structural variety. The main focus has been on the transition metal clusters containing chalcogens which act as bridges between different metal fragments and are helpful in cluster growth reactions and maintains the cluster integrity. A synthetic strategy has been developed to prepare a mixed metal cluster when a dichloromethane solution of [Fe3Y2(CO)6], Y=S, Se, Te and ML4 (M=Pd, L=PPh3) was reacted at room temperature in presence of trimethylamine-N-oxide. Substitution reaction of carbonyl groups by triphenylphosphine and bis(diphenylphosphino)methane ligands results in the formation of different types of trinuclear clusters. Homo metallic cluster as well mixed metal clusters with phosphine ligands has been synthesized by a room temperature reaction and characterized by FTIR, proton and 31P NMR spectroscopy. Some of the transition metal cluster contains chelating phosphine ligands which stabilizes the cluster integrity.
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Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
The chemistry of transition metal chalcogenide polynuclear clusters is a rapidly expanding area. The increasing interest is due to the search for structural models and precursors of extended inorganic solids with novel electronic, magnetic and optical properties. Our interest for the synthesis of a variety of transition - etal clusters is due to their use as a model and precursors for materials and catalyst. Synthesis and study of a variety of ligand substituted iron carbonyl cluster has been carried out to understand the reactivity features and structural variety. The main focus has been on the transition metal clusters containing chalcogens which act as bridges between different metal fragments and are helpful in cluster growth reactions and maintains the cluster integrity. A synthetic strategy has been developed to prepare a mixed metal cluster when a dichloromethane solution of [Fe3Y2(CO)6], Y=S, Se, Te and ML4 (M=Pd, L=PPh3) was reacted at room temperature in presence of trimethylamine-N-oxide. Substitution reaction of carbonyl groups by triphenylphosphine and bis(diphenylphosphino)methane ligands results in the formation of different types of trinuclear clusters. Homo metallic cluster as well mixed metal clusters with phosphine ligands has been synthesized by a room temperature reaction and characterized by FTIR, proton and 31P NMR spectroscopy. Some of the transition metal cluster contains chelating phosphine ligands which stabilizes the cluster integrity.
Author: Paul J. Dyson
Publisher: CRC Press
ISBN: 1482283077
Category : Science
Languages : en
Pages : 180
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Book Description
Transition metal carbonyl clusters (TMCCs) continue to inspire great interest in chemical research, as much for their fascinating structures as for potential industrial applications conferred by their unique properties. This highly accessible book introduces the bonding, structure, spectroscopic properties, and characterization of clusters, and then explores their synthesis, reactivity, reaction mechanisms and use in organic synthesis and catalysis. Transition Metal Carbonyl Cluster Chemistry describes models and rules that correlate cluster structure with electron count, which are then applied in worked examples. Subsequent chapters explain how bonding relates to molecular structure, demonstrate the use of spectroscopic techniques such as NMR, IR and MS in cluster chemistry, and outline the factors contributing to the stability, dynamics and reactivity of clusters. The second part of this book discusses the synthesis and applications of TMCCs. It emphasizes the differences between the reactivities of clusters vs. mononuclear metal complexes, contingent to the availability of multiple-bonding sites and heterosite reactivity. The final chapters discuss reactions in which clusters act as homogeneous catalysts; including discussion on the use of solid and biphasic liquid-liquid supported clusters in heterogeneous catalysts. A useful reference for those commencing further research or post-graduate study on metal carbonyl clusters and advanced organometallic chemistry, this book is also a cornerstone addition to academic and libraries as well as private collections.
Author: Simone Hauser
Publisher:
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Category :
Languages : en
Pages :
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Author: Louis M. Pignolet
Publisher: Springer Science & Business Media
ISBN: 1461336236
Category : Science
Languages : en
Pages : 494
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Book Description
The field of transition metal catalysis has experienced incredible growth during the past decade. The reasons for this are obvious when one considers the world's energy problems and the need for new and less energy demanding syntheses of important chemicals. Heterogeneous catalysis has played a major industrial role; however, such reactions are generally not selective and are exceedingly difficult to study. Homogeneous catalysis suffers from on-site engineering difficulties; however, such reactions usually provide the desired selectivity. For example, Monsanto's synthesis of optically-active amino acids employs a chiral homogeneous rhodium diphosphine catalyst. Industrial uses of homogeneous catalyst systems are increasing. It is not by accident that many homogeneous catalysts contain tertiary phosphine ligands. These ligands possess the correct steric and electronic properties that are necessary for catalytic reactivity and selectivity. This point will be emphasized throughout the book. Thus the stage is set for a comprehensive be treatment of the many ways in which phosphine catalyst systems can designed, synthesized, and studied.
Author: B. S. Nicholls
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Ravi Yadav
Publisher:
ISBN: 9783736971233
Category :
Languages : en
Pages : 170
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The work reported in this thesis is divided into three parts. In the first part, the synthesis of Zn-Au heterometallic complexes is described by using bifunctional carboxy-phosphine ligands. The second part of this thesis focuses on redox reactions between divalent lanthanides (LnII) and transition metal (TM) carbonyl complexes for the synthesis of high nuclearity heterometallic complexes. The third and final part of this thesis focuses on reactivity studies of [Cp*Fe(Л5-P5)] with lowvalent main group compounds.
Author: Sergei A. Ivanov
Publisher:
ISBN:
Category :
Languages : en
Pages : 476
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Author: Ricardo Alejandro Delgado
Publisher:
ISBN:
Category : Catalysis
Languages : en
Pages : 316
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Author: Duward F. Shriver
Publisher: Wiley-VCH
ISBN:
Category : Science
Languages : en
Pages : 456
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Book Description
Seven chapters summarize the current status of organometallic cluster chemistry from the viewpoints of synthesis, structure and bonding, ligand substitution reactions, ligand transformations, polyhedral rearrangement, cluster fragmentation reactions, and metal clusters as homogeneous catalysts. An eighth provides an extensive bibliography of reviews for the period from 1965 to 1988. Annotation copyrighted by Book News, Inc., Portland, OR
Author: Frederic Roy Furuya
Publisher:
ISBN:
Category :
Languages : en
Pages : 348
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