Synthesis and Characterization of Peroxo Vananidium (V
... polyvinyl chloride. The former is more active (14). Vanadyl phthalocyanine is effective as a smoke reducer for various styrene polymers. Vanadium (v) has been successfully applied as an oxidant in acidic medium. A vanadium protein has also been proposed to catalyze the oxidation of NADH (15). The si ...
... polyvinyl chloride. The former is more active (14). Vanadyl phthalocyanine is effective as a smoke reducer for various styrene polymers. Vanadium (v) has been successfully applied as an oxidant in acidic medium. A vanadium protein has also been proposed to catalyze the oxidation of NADH (15). The si ...
Theoretical Studies of Oxidative Addition and Reductive Elimination
... to model concerted reductive coupling from MR2Lpcomplexes (where L is a substituted phosphine). The results of these calculations support the following two conclusions. (1)The difference in the driving force for reductive elimination from Pd(I1) and Pt(I1) complexes with the same R groups is very cl ...
... to model concerted reductive coupling from MR2Lpcomplexes (where L is a substituted phosphine). The results of these calculations support the following two conclusions. (1)The difference in the driving force for reductive elimination from Pd(I1) and Pt(I1) complexes with the same R groups is very cl ...
The solid state and solution structures of tin(IV)
... pH, solvent and water/Si molar ratio have been rationalized. Two types of kinetic growth processes are generally recognized (but not universally accepted): monomercluster growth and cluster-cluster growth [16,17]. Each of these processes may proceed under reaction-limited or diffusion-limited condit ...
... pH, solvent and water/Si molar ratio have been rationalized. Two types of kinetic growth processes are generally recognized (but not universally accepted): monomercluster growth and cluster-cluster growth [16,17]. Each of these processes may proceed under reaction-limited or diffusion-limited condit ...
C 241 (Experiment No. ______) NAME: BATCH:______ ROLL NO
... Complexometric titrations are one of the analytical applications of complexation reaction between metal ion and a chelating agent viz. ethylenediaminetetraacetic acid, EDTA. Because of involvement of chelating agent it is known as chilometric or chilatometric titration or chilometry. EDTA has four c ...
... Complexometric titrations are one of the analytical applications of complexation reaction between metal ion and a chelating agent viz. ethylenediaminetetraacetic acid, EDTA. Because of involvement of chelating agent it is known as chilometric or chilatometric titration or chilometry. EDTA has four c ...
Giant Rugby Ball [{CpBnFe(η5-P5)}24Cu96Br96
... chalcogenide clusters,3 or (inter)metalloid clusters.4 Among them are the largest structurally characterized aggregates: concerning the size, the “hedgehog” cluster [HxMo368O1032(H2O)240(SO4)48]48‑ (x ≈ 16) reaches an outer diameter of ca. 6 nm.5 Regarding the largest number of metal atoms: the clus ...
... chalcogenide clusters,3 or (inter)metalloid clusters.4 Among them are the largest structurally characterized aggregates: concerning the size, the “hedgehog” cluster [HxMo368O1032(H2O)240(SO4)48]48‑ (x ≈ 16) reaches an outer diameter of ca. 6 nm.5 Regarding the largest number of metal atoms: the clus ...
Pdf - Text of NPTEL IIT Video Lectures
... monoxides are in a tetrahedral environment around the metal. Surprisingly, when you talk about these negatively charged systems they are also capable of forming dimeric complexes. Here are 2 instances, where you have 2 dimeric complexes that are formed, it looks as if you can have some other ways of ...
... monoxides are in a tetrahedral environment around the metal. Surprisingly, when you talk about these negatively charged systems they are also capable of forming dimeric complexes. Here are 2 instances, where you have 2 dimeric complexes that are formed, it looks as if you can have some other ways of ...
Vanadium complexes containing amido functionalized
... When the purple complex 3 was treated with one equivalent of Me3SiCH2Li, a color change to green was observed. When MeLi was used, gas evolution (probably methane) was observed together with this color change. The product of this reaction, the Cp-amido vanadium(III) complex (η5,η1C5H4CH2CH2Ni-Pr)VCl ...
... When the purple complex 3 was treated with one equivalent of Me3SiCH2Li, a color change to green was observed. When MeLi was used, gas evolution (probably methane) was observed together with this color change. The product of this reaction, the Cp-amido vanadium(III) complex (η5,η1C5H4CH2CH2Ni-Pr)VCl ...
Luminescent sensor molecules based on coordinated metals: a
... either alkali and alkaline earth metals (for example — lithium, sodium, potassium, zinc, calcium and magnesium) in which detection is necessary to monitor and regulate a number of cellular functions. Heavy metal cations such as lead and mercury have also been studied, due to their deleterious effect ...
... either alkali and alkaline earth metals (for example — lithium, sodium, potassium, zinc, calcium and magnesium) in which detection is necessary to monitor and regulate a number of cellular functions. Heavy metal cations such as lead and mercury have also been studied, due to their deleterious effect ...
Study on Synthesis and Antibacterial Activity of Co(II) and NiC(II
... to the metal ion(25). The spectra of L2H shows a band at 3300–3460cm–1, this band has been shifted towards a lower frequency indicating the formation of chelation between the nitrogen of NH2 group and the metal ion(25). The ligand L1H, L3H and L4H show a band at 1525 and 1355cm–1 due to the nitro gr ...
... to the metal ion(25). The spectra of L2H shows a band at 3300–3460cm–1, this band has been shifted towards a lower frequency indicating the formation of chelation between the nitrogen of NH2 group and the metal ion(25). The ligand L1H, L3H and L4H show a band at 1525 and 1355cm–1 due to the nitro gr ...
Extremely Bulky Amido d-Block Metal(II) Halide Complexes
... rings. The low coordination number of the metal centres in these compounds is a direct effect of the significant bulk of the [3,5-iPr2-ArTripp] ligands. The related iron(II) chloride complex [{3,5-iPr2-ArTrippFe(µ-Cl)}2] was also targeted by salt metathesis, i.e. the reaction between [3,5-iPr2-ArTrip ...
... rings. The low coordination number of the metal centres in these compounds is a direct effect of the significant bulk of the [3,5-iPr2-ArTripp] ligands. The related iron(II) chloride complex [{3,5-iPr2-ArTrippFe(µ-Cl)}2] was also targeted by salt metathesis, i.e. the reaction between [3,5-iPr2-ArTrip ...
PDF File
... single turnover, with ribozyme in excess of the radiolabeled 5′-splice site analogue (*S) or 3′-splice site analogue (*P), which was always present in trace quantities. Reactions were carried out at 30 °C in 50 mM buffer, 50 mM MgCl2, and varying concentrations of CdCl2. The buffers used were NaMES ...
... single turnover, with ribozyme in excess of the radiolabeled 5′-splice site analogue (*S) or 3′-splice site analogue (*P), which was always present in trace quantities. Reactions were carried out at 30 °C in 50 mM buffer, 50 mM MgCl2, and varying concentrations of CdCl2. The buffers used were NaMES ...
Synthesis and characterization of titanium(IV) complexes containing
... constants for soluble substituted (cyclopentadienyl)thallium compounds has been attributed to the enforced covalency of the metal–ring interaction in the compound [8]. The absence of 1H, 13C and 31P couplings with 203,205Tl in the spectra of compound 3 may indicate that the interaction in 3 is predo ...
... constants for soluble substituted (cyclopentadienyl)thallium compounds has been attributed to the enforced covalency of the metal–ring interaction in the compound [8]. The absence of 1H, 13C and 31P couplings with 203,205Tl in the spectra of compound 3 may indicate that the interaction in 3 is predo ...
A E M , Apr. 2004, p. 2551–2555
... The chemical stress factors for microbial life at deep-sea hydrothermal vents include high concentrations of heavy metals and sulfide. Three hyperthermophilic vent archaea, the sulfur-reducing heterotrophs Thermococcus fumicolans and Pyrococcus strain GB-D and the chemolithoautotrophic methanogen Me ...
... The chemical stress factors for microbial life at deep-sea hydrothermal vents include high concentrations of heavy metals and sulfide. Three hyperthermophilic vent archaea, the sulfur-reducing heterotrophs Thermococcus fumicolans and Pyrococcus strain GB-D and the chemolithoautotrophic methanogen Me ...
RSC_NJ_C1NJ20460B 1..7
... complex stability order observed for metal catechol complexes.25 La(catechol)+ is the weakest (log Kf = 1.52 at pH 7.0) and Fe(catechol)+ (log Kf = 11.8 at pH 7.0) the most stable complex. The quenching efficiency of Fe, Sc, Al and Cu does not follow metal–catechol complex stability, suggesting that s ...
... complex stability order observed for metal catechol complexes.25 La(catechol)+ is the weakest (log Kf = 1.52 at pH 7.0) and Fe(catechol)+ (log Kf = 11.8 at pH 7.0) the most stable complex. The quenching efficiency of Fe, Sc, Al and Cu does not follow metal–catechol complex stability, suggesting that s ...
The Synthesis of Ferrocene
... 18 electron sandwich type complex and first of the metallocenes to be synthesized. We will then acetylate the cyclopentadienyl ligand of the complex using a Friedel-Crafts Acylation technique, demonstrating the ligands of the complex are truly aromatic. Ferrocene, (C5H5)2Fe, was first discovered in ...
... 18 electron sandwich type complex and first of the metallocenes to be synthesized. We will then acetylate the cyclopentadienyl ligand of the complex using a Friedel-Crafts Acylation technique, demonstrating the ligands of the complex are truly aromatic. Ferrocene, (C5H5)2Fe, was first discovered in ...
Investigating the Dearomative Rearrangement of Biaryl Phosphine- Ligated Pd(II) Complexes
... phosphine ligands play a key role in determining the catalytic activity of their Pd complexes; bulkier ligands, i.e., those bearing tert-butyl and adamantyl groups, are typically used in crosscoupling reactions that have difficult reductive elimination steps. Thus, we decided to investigate the behavi ...
... phosphine ligands play a key role in determining the catalytic activity of their Pd complexes; bulkier ligands, i.e., those bearing tert-butyl and adamantyl groups, are typically used in crosscoupling reactions that have difficult reductive elimination steps. Thus, we decided to investigate the behavi ...
IJCA 42A(9) 2175-2184
... certain questions. The goal is to elucidate fundamental aspects of structure, spectroscopy, magnetic and electronic structure, reactivity and chemical mechanism. A synergistic approach to the study of metalloenzymes can and has yielded crucial information because synthetic analogues can be used to i ...
... certain questions. The goal is to elucidate fundamental aspects of structure, spectroscopy, magnetic and electronic structure, reactivity and chemical mechanism. A synergistic approach to the study of metalloenzymes can and has yielded crucial information because synthetic analogues can be used to i ...
Gold Liquid Crystals in the XXI Century
... This review is focused in the results reported during the new century. It is organized by the oxidation state, and then by the mesogenic ligand involved in alphabetical order. Liquid crystals made of gold nanoparticles are an exciting subject, which is not included in this review [10,11]. 2. Gold(I) ...
... This review is focused in the results reported during the new century. It is organized by the oxidation state, and then by the mesogenic ligand involved in alphabetical order. Liquid crystals made of gold nanoparticles are an exciting subject, which is not included in this review [10,11]. 2. Gold(I) ...
Cobalt-Ammine complexes handout
... when the compound is reacted with AgNO3. CoCl3*5NH3 and CoCl3*4NH3 have only two and one free chlorine ions, respectively, because the other chlorines are covalently bound to the metal. The three-ammonia complex that Jørgensen synthesized from iridium has no free chlorines, and so does not conduct e ...
... when the compound is reacted with AgNO3. CoCl3*5NH3 and CoCl3*4NH3 have only two and one free chlorine ions, respectively, because the other chlorines are covalently bound to the metal. The three-ammonia complex that Jørgensen synthesized from iridium has no free chlorines, and so does not conduct e ...
A density functional theory protocol for the calculation of redox
... [CuL3]+ and [CuL3]2+: there are two possible configurations for the complex of a cyclic hexadentate ligand in an octahedral structure: mesomeric (meso), in which the two S–S–S linkages each binds facially to the metal center, and racemic (rac), in which the two S–S–S portions each binds meridionally ...
... [CuL3]+ and [CuL3]2+: there are two possible configurations for the complex of a cyclic hexadentate ligand in an octahedral structure: mesomeric (meso), in which the two S–S–S linkages each binds facially to the metal center, and racemic (rac), in which the two S–S–S portions each binds meridionally ...
From giant molecular clusters and precursors to solid
... mentally, the given objects into elementary building blocks (e.g. polygons, polyhedra or aggregates of these) and then tries to identify and explore the local matching rules according to which the building blocks are to be assembled to yield the considered objects. A realistic model system for this ...
... mentally, the given objects into elementary building blocks (e.g. polygons, polyhedra or aggregates of these) and then tries to identify and explore the local matching rules according to which the building blocks are to be assembled to yield the considered objects. A realistic model system for this ...
Photochemistry and photophysics of antimony (III) hyper porphyrins
... Metalloporphyrins are essentially involved in various fundamental biological processes, such as electron transport, catalysis of redox reactions, storage and transport of oxygen, and photosynthetic energy conversion.'" This remarkable diversity of functions is achieved by suitable modifications of t ...
... Metalloporphyrins are essentially involved in various fundamental biological processes, such as electron transport, catalysis of redox reactions, storage and transport of oxygen, and photosynthetic energy conversion.'" This remarkable diversity of functions is achieved by suitable modifications of t ...
Lecture 2
... or cations with d electrons not available for π-bonding Soft acids are cations with a moderate positive charge (2+ or lower), Or cations with d electrons readily availbale for π-bonding ...
... or cations with d electrons not available for π-bonding Soft acids are cations with a moderate positive charge (2+ or lower), Or cations with d electrons readily availbale for π-bonding ...
Synthesis and physico-chemical studies on transition metal
... N1· II and Zn II ; X=CI, NO) have been prepared by the template condensation reaction of2-6-diacetylpyridine dihydrazone, ' L ' and formaldehyde in methanol medium in a 2:2 ratio (Scheme 1). An attempt was made to synthesize metal free macrocyclic li gand which resulted in an oily product. All the c ...
... N1· II and Zn II ; X=CI, NO) have been prepared by the template condensation reaction of2-6-diacetylpyridine dihydrazone, ' L ' and formaldehyde in methanol medium in a 2:2 ratio (Scheme 1). An attempt was made to synthesize metal free macrocyclic li gand which resulted in an oily product. All the c ...
Ligand
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.