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spectroscopy and structures of metal
... spectra. Metal-ligand bonding and low-lying electronic states of the neutral and ionized complexes were analyzed by combining the ZEKE measurements with density functional theory (DFT) calculations. In addition, C-H stretching frequencies were measured from the R2PI spectra. In this dissertation, me ...
... spectra. Metal-ligand bonding and low-lying electronic states of the neutral and ionized complexes were analyzed by combining the ZEKE measurements with density functional theory (DFT) calculations. In addition, C-H stretching frequencies were measured from the R2PI spectra. In this dissertation, me ...
Proceeding of the National Academy of Sciences of the USA 2006
... determined readily. In a series of experiments of this type, Keq was established to be ⬇0.1 (see supporting information for details). The fact that equilibrium is reached in 1–2 h rules out any rate-limiting unimolecular loss of dinitrogen from MoN2; dinitrogen most likely is replaced by ammonia in ...
... determined readily. In a series of experiments of this type, Keq was established to be ⬇0.1 (see supporting information for details). The fact that equilibrium is reached in 1–2 h rules out any rate-limiting unimolecular loss of dinitrogen from MoN2; dinitrogen most likely is replaced by ammonia in ...
1 - DORAS
... Firstly I have to thank Han. At all times you were supportive, helpful and ready to offer a joke whenever things were getting tough. I a m grateful to have worked with you for the past four years and you were an excellent mentor. Plus, no longer will I think of the Dutch as just those people w h o a ...
... Firstly I have to thank Han. At all times you were supportive, helpful and ready to offer a joke whenever things were getting tough. I a m grateful to have worked with you for the past four years and you were an excellent mentor. Plus, no longer will I think of the Dutch as just those people w h o a ...
Nickel(II) Catalysts for Ethylene Homo
... (HDPE) can be made with Ziegler-Natta or metallocene catalysts and linear low density PE (LLDPE) can be synthesized by copolymerizing ethylene with #-olefins in the presence of early transition metal catalysts. Industrially, low density PE (LDPE) and functionalized PE derived from the copolymerizati ...
... (HDPE) can be made with Ziegler-Natta or metallocene catalysts and linear low density PE (LLDPE) can be synthesized by copolymerizing ethylene with #-olefins in the presence of early transition metal catalysts. Industrially, low density PE (LDPE) and functionalized PE derived from the copolymerizati ...
THE SYNTHESIS AND CHARACTERIZATION OF PHOSPHONIUM INDENYLIDE COMPLEXES OF RUTHENIUM(II)
... transition metal ligands. The ylidic resonance structure b of this compound is isoelectronic with the cyclopentadienyl ligand which is ubiquitous throughout organometallic chemistry. Phosphonium indenylides have been found to have electron donating properties between those of η6-benzene and η5-cyclo ...
... transition metal ligands. The ylidic resonance structure b of this compound is isoelectronic with the cyclopentadienyl ligand which is ubiquitous throughout organometallic chemistry. Phosphonium indenylides have been found to have electron donating properties between those of η6-benzene and η5-cyclo ...
Chapter 1 Structure and Bonding
... Most NO3- salts are soluble Most alkali metal and NH4+ salts are soluble Most Cl-, Br-, and I- salts are soluble (except: Ag+, Pb2+, and Hg22+) Most SO42- salts are soluble (except Ba2+, Pb2+, Hg22+, and Ca2+) Most OH- salts are insoluble (except NaOH, KOH) Most S2-, CO32-, CrO42-, and PO43- salts a ...
... Most NO3- salts are soluble Most alkali metal and NH4+ salts are soluble Most Cl-, Br-, and I- salts are soluble (except: Ag+, Pb2+, and Hg22+) Most SO42- salts are soluble (except Ba2+, Pb2+, Hg22+, and Ca2+) Most OH- salts are insoluble (except NaOH, KOH) Most S2-, CO32-, CrO42-, and PO43- salts a ...
Hierarchical Self-Assembly of One-Dimensional
... three-dimensional frameworks. In addition to their appealing architecture, these coordination polymers (also coined metal– organic frameworks) possess cavities that can accommodate various guest molecules. Such guesthost complexes often display unusual properties such as chemical reactivity, energy ...
... three-dimensional frameworks. In addition to their appealing architecture, these coordination polymers (also coined metal– organic frameworks) possess cavities that can accommodate various guest molecules. Such guesthost complexes often display unusual properties such as chemical reactivity, energy ...
Chapter 5 - DORAS
... As discussed in chapter 4 the coupling of organic halides with organometallic reagents to form carbon-carbon σ bonds is a reaction of tremendous importance in organic synthetic chemistry and one which is becoming more significant within inorganic synthesis also. Although this reaction can proceed in ...
... As discussed in chapter 4 the coupling of organic halides with organometallic reagents to form carbon-carbon σ bonds is a reaction of tremendous importance in organic synthetic chemistry and one which is becoming more significant within inorganic synthesis also. Although this reaction can proceed in ...
Inorganic Chemistry
... before Chapters 5 or 6. Chapter 6 contains material dealing with intermolecular forces and polarity of molecules because of the importance of these topics when interpreting properties of substances and their chemical behavior. In view of the importance of the topic, especially in industrial chemistr ...
... before Chapters 5 or 6. Chapter 6 contains material dealing with intermolecular forces and polarity of molecules because of the importance of these topics when interpreting properties of substances and their chemical behavior. In view of the importance of the topic, especially in industrial chemistr ...
From metal complexes to fullerene arrays: exploring the exciting
... a heterogeneous group of scientists met to discuss the perspectives of a new branch of science that was emerging, which was termed Supramolecular Photochemistry. Some months later the Nobel Prize in Chemistry was awarded to Jean-Marie Lehn 2 (who participated in the meeting), Donald Cram 3 and Charl ...
... a heterogeneous group of scientists met to discuss the perspectives of a new branch of science that was emerging, which was termed Supramolecular Photochemistry. Some months later the Nobel Prize in Chemistry was awarded to Jean-Marie Lehn 2 (who participated in the meeting), Donald Cram 3 and Charl ...
THE DIFFERENCE-DEDICATED CONFIGURATION INTERACTION METHOD: AN ACCURATE PROCEDURE TO CALCULATE ENERGY TRANSITIONS
... correct for vertical transitions, but the method may as well be applied to calculate adiabatic transitions. The contributions of the neglected double excitations to the correlation energy of each state vary with the geometry and their effect must be evaluated and added to the results of the DDCI cal ...
... correct for vertical transitions, but the method may as well be applied to calculate adiabatic transitions. The contributions of the neglected double excitations to the correlation energy of each state vary with the geometry and their effect must be evaluated and added to the results of the DDCI cal ...
Transition metal-catalysed hydrogen transfer processes for C C and C N
... Combining two or more elementary reactions is the major challenge in developing new one-pot reactions. Tandem, domino, cascade, and one-pot reactions are often used as interchangeable synonyms referring to the transformation of a substrate through two or more individual reactions, with just a single ...
... Combining two or more elementary reactions is the major challenge in developing new one-pot reactions. Tandem, domino, cascade, and one-pot reactions are often used as interchangeable synonyms referring to the transformation of a substrate through two or more individual reactions, with just a single ...
CHAPTER 1 INTRODUCTION 1.1 HYDRAZINE
... powered engines. As a strong reducing agent, hydrazine is used for corrosion control in boilers and hot water heating systems, for metal plating, and for reducing noble metal catalysts and unsaturated bonds in organic compounds. It is also an oxidizing agent under suitable conditions with two active ...
... powered engines. As a strong reducing agent, hydrazine is used for corrosion control in boilers and hot water heating systems, for metal plating, and for reducing noble metal catalysts and unsaturated bonds in organic compounds. It is also an oxidizing agent under suitable conditions with two active ...
New. J. Chem., 1992, 16, 633-642
... The photoreductions of both porphyrins and metalloporphyrins are also known. In these cases reducing agents such as ascorbic acid, glutathione, EDTA, or ethyl acetoacetonate are necessary “. In strongly acidic solutions, porphyrins can be rapidly photoreduced to chlorins and bacteriochlorins. These ...
... The photoreductions of both porphyrins and metalloporphyrins are also known. In these cases reducing agents such as ascorbic acid, glutathione, EDTA, or ethyl acetoacetonate are necessary “. In strongly acidic solutions, porphyrins can be rapidly photoreduced to chlorins and bacteriochlorins. These ...
ANNEX (Manuscrits posteriors a la Comissió de Doctorat de Juliol del...
... anion, [3,3’-Co(1,2-C2B9H11)2]-, [1]-, has been prevalent within the boron cluster literature, and it continues to be a subject of intense study.2 Halogen substituted derivatives such as [8,8’,9,9’,12,12’-X6-3,3’-Co(1,2-C2B9H8)2]-, (X= Cl, Br, I), [8,8’X2-3,3’-Co(1,2-C2B9H10)2]-, (X= Cl, Br, I), hav ...
... anion, [3,3’-Co(1,2-C2B9H11)2]-, [1]-, has been prevalent within the boron cluster literature, and it continues to be a subject of intense study.2 Halogen substituted derivatives such as [8,8’,9,9’,12,12’-X6-3,3’-Co(1,2-C2B9H8)2]-, (X= Cl, Br, I), [8,8’X2-3,3’-Co(1,2-C2B9H10)2]-, (X= Cl, Br, I), hav ...
Crystal structures of IspF from Plasmodium falciparum and
... where Zn2+ is bound and where recognition of the cytidine moiety of substrate occurs. However, conformational flexibility is noted in that area of the active site responsible for binding the methylerythritol component of substrate. Unexpectedly, one structure of BcIspF revealed two molecules of cyti ...
... where Zn2+ is bound and where recognition of the cytidine moiety of substrate occurs. However, conformational flexibility is noted in that area of the active site responsible for binding the methylerythritol component of substrate. Unexpectedly, one structure of BcIspF revealed two molecules of cyti ...
-108- Chapter 7 Answers to Problems 7.1 In I all d orbitals transform
... (d) The a1' and a2" SALCs, which form nonbonding MOs in the d-only scheme, could form bonding and antibonding combinations with s and pz AOs on the metal. The px and py AOs could form bonding and antibonding combinations with the e' SALCs, which in the d-only scheme form bonding and antibonding comb ...
... (d) The a1' and a2" SALCs, which form nonbonding MOs in the d-only scheme, could form bonding and antibonding combinations with s and pz AOs on the metal. The px and py AOs could form bonding and antibonding combinations with the e' SALCs, which in the d-only scheme form bonding and antibonding comb ...
18 Chapter 3 Structures of Coordination Compounds Problem
... *3.21. Prior to Werner's synthesis and resolution of coordination compounds containing chelating agents, the evidence for his coordination theory had been "negative." That is to say, his theory often predicted only two isomers for a given MA4B2 or MA3B3 complex (where A and B are monodentate ligands ...
... *3.21. Prior to Werner's synthesis and resolution of coordination compounds containing chelating agents, the evidence for his coordination theory had been "negative." That is to say, his theory often predicted only two isomers for a given MA4B2 or MA3B3 complex (where A and B are monodentate ligands ...
SOLUBILITY EQUILIBRIA
... whether a ppt will form AND what concentrations of ions are required to begin the ppt. of an insoluble salt. 1. Q < Ksp, the system is not at equil. (unsaturated) 2. Q = Ksp, the system is at equil. (saturated) 3. Q > Ksp, the system is not at equil. (supersaturated) Precipitates form when the s ...
... whether a ppt will form AND what concentrations of ions are required to begin the ppt. of an insoluble salt. 1. Q < Ksp, the system is not at equil. (unsaturated) 2. Q = Ksp, the system is at equil. (saturated) 3. Q > Ksp, the system is not at equil. (supersaturated) Precipitates form when the s ...
metal ions in solution
... With ammonia solution Ammonia and water are similar in size and uncharged. Ligand exchange occurs without change of co-ordination number Firstly, a precipitation reaction occurs (see above). In some cases, with excess ammonia, the precipitate dissolves. With copper(II) the overall effect is to repla ...
... With ammonia solution Ammonia and water are similar in size and uncharged. Ligand exchange occurs without change of co-ordination number Firstly, a precipitation reaction occurs (see above). In some cases, with excess ammonia, the precipitate dissolves. With copper(II) the overall effect is to repla ...
pdf
... constant of 1021.74 (Clarke and Martell 1991) but has a conditional stability constant in seawater of about 1016 because of side reactions with Ca2+ and Mg2+. This is comparable to the highest value reported for natural Cu organic complexes in seawater of 1016.6, which Kogut and Voelker (2003) deter ...
... constant of 1021.74 (Clarke and Martell 1991) but has a conditional stability constant in seawater of about 1016 because of side reactions with Ca2+ and Mg2+. This is comparable to the highest value reported for natural Cu organic complexes in seawater of 1016.6, which Kogut and Voelker (2003) deter ...
Notes 6 - Macdonald Research Group
... Carbenes, and the isovalent carbenoids from groups 13, 14 and 15 are compounds that contain di-coordinate atoms and bear a pair of electrons for a total of 6 valence electrons. ...
... Carbenes, and the isovalent carbenoids from groups 13, 14 and 15 are compounds that contain di-coordinate atoms and bear a pair of electrons for a total of 6 valence electrons. ...
Ligand
![](https://commons.wikimedia.org/wiki/Special:FilePath/HCo(CO)4-3D-balls.png?width=300)
In coordination chemistry, a ligand (/lɪɡənd/) is an ion or molecule (functional group) that binds to a central metal atom to form a coordination complex. The bonding between metal and ligand generally involves formal donation of one or more of the ligand's electron pairs. The nature of metal-ligand bonding can range from covalent to ionic. Furthermore, the metal-ligand bond order can range from one to three. Ligands are viewed as Lewis bases, although rare cases are known to involve Lewis acidic ""ligand.""Metals and metalloids are bound to ligands in virtually all circumstances, although gaseous ""naked"" metal ions can be generated in high vacuum. Ligands in a complex dictate the reactivity of the central atom, including ligand substitution rates, the reactivity of the ligands themselves, and redox. Ligand selection is a critical consideration in many practical areas, including bioinorganic and medicinal chemistry, homogeneous catalysis, and environmental chemistry.Ligands are classified in many ways like : their charge, their size (bulk), the identity of the coordinating atom(s), and the number of electrons donated to the metal (denticity or hapticity). The size of a ligand is indicated by its cone angle.