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Showing 1 to 20 of 70 for “"monodentate"”.
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Carbon−Hydrogen Bond Functionalization using Removable Monodentate Directing Groups
… C−H/N−H coupling directed by a removable monodentate auxiliary in absence of added ligands. Chapter 3: N-Aminopyridinium ylides are competent monodentate directing groups for cobalt-catalyzed annulation of sp2 C−H bonds with internal alkynes. Pyridine moiety in ylide serves as an internal …
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Intramolecular Ligand Permutation at Tetracoordinate and Pentacoordinate Silicon (Pseudorotation, Hypervalent)
… = 28.3 kcal/mol). The rate of monodentate Si-C bond cleavage of arylsiliconates 3 by bromine and triflic acid decreases markedly as the electron withdrawing ability of the monodentate ligand increases. Phenyl- and n-butylsilicontes 3 react with bromine at comparable rates to …
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Rhodium-katalysierte, asymmetrische Synthese: Ligandendesign und Methodik
… catalyst precursors and phosphorous-containing monodentate and bidentate ligands. Application of bidentate ligands such as members of the Taniaphos or the Walphos family furnished the exo-diastereomer predominantly and with up to 82% ee. In contrast, the use of monodentate ligands such as the …
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Squaric acid as a versatile compound in the design of molecular solids
… modes of the squarate dianion are µ-1,2-bis(monodentate) in the dinuclear compound and µ-1,3-bis(monodentate) in polynuclear compounds.3. Ag(I)-squarate coordination polymers which combine the bridging ability of squarate with the flexibility in the coordination number, donor type and the …
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Synthesis, characterization and anticancer studies of multinuclear ruthenium(II) arene complexes based on a dendritic scaffold
A series of monodentate (N-) and chelating bidentate (N,N-, N,O-), monomeric and dendritic ligands based on a poly(propyleneimine) dendrimer scaffold were synthesized via Schiff base condensation reactions of the relevant amine and appropriate aldehydes. These reactions yielded air- and …
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Axial chirale Phosphite als Liganden in der enantioselektiven Rhodium-katalysierten Hydrierung
… easy and of low costs. As part of this work new monodentate, axially chiral phosphite-ligands with Cl-MeOBiphenyl-backbone were synthesized. The route to the key intermediate ClMeOBiphenol was improved essentially and both optical antipodes are accessable now with ee´s > 99%. In contrary to the …
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Design, Syntheses and Functional Studies of DNA Binding Metal Complexes
… at the N7-site of the guanines forming a monodentate adduct, but only the cis-isomer has anticancer activity. The interactions of these platinum complexes with the DNA-heptamer d(CCTGTCC):d(GGACAGG) were examined and a NMR based high resolution structure was determined. Surprisingly both …
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Progressive design and self-assembly of supramolecular architectures : based on metallamacrocyclic nickel(II) complexes with bipodal tetra-alkylaroylbis (thioureas)
… into octahedral adducts via the addition of monodentate nitrogen donor ligands. Metallamacrocycles are further employed as secondary building units in the self-assembly of I-dimensional double- or tripleconnected coordination polymers. The synthesis of these polymers is achieved with the use …
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New luminescent iridium (III) complexes containing NCN cyclometallated ligands: synthesis, photophysical properties and emission tuning
… N^C a bidentate ligand such as ppy; and X is a monodentate ligand such as chloride, cyanide, thiocyanate or an acetylide. The synthetic methodology developed involves reaction of the N^CH^N proligand with iridium(III) chloride to give a dimer of the form [Ir(N^C^N)Cl(-Cl)]2, which is cleaved …
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Self-Assembly, Spatial-, and Size- Control of Gold Nanoparticle/Block Copolymer Conjugates
… Pyridylterminated polystyrenes were employed as monodentate ligands for AuNP, while longer blocks of 4VP were used as multidentate ligands. The control of selectivity and distribution of metal nanoparticles within the S4VP block copolymer domains were probed by two different methods, namely …
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Exploring hetero-atom derivatization in maltols and flavonols : the effect on reactivity of flavonol dioxygenation.
… and ring substitutions. We successfully isolate monodentate hetero-maltolate complexes and propose a reaction scheme to access similar monodentate hetero-flavonolate complexes which can then be studied as model QDOs.
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Selective, nickel-catalyzed carbon-carbon bond-forming reactions of alkynes
… enriched homoallylic alcohols. P-chiral, monodentate ferrocenyl phosphine ligands are efficient promoters of catalytic, asymmetric reductive coupling reactions of 1,3-enynes with aromatic aldehydes and with ketones. The latter represents the first catalytic intermolecular reductive …
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Nickel-catalyzed cross-couplings of unactivated secondary and tertiary alkyl halides and photoinduced copper-mediated asymmetric C-N cross-couplings
… halides and carbazoles, with the use of a monodentate chiral phosphine ligand, are presented. The methodology is then extended to secondary [alpha]-haloamides, including [alpha]-halolactams, which are found to afford very promising yields and enantioselectivities.
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Chemical Controls on the Formation of Amorphous and Crystalline Calcium Phosphates
… 0.2 the Ca – P bonding geometry is primarily monodentate, ratio 5.0 produces a coordination that is primarily bidentate, and there is a mix of monodentate and bidentate coordinates at intermediate ratios between the two. These results are independent of system pH between the examined range of …
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Efforts Toward the Site-Selective Dehydrogenation of Saturated Fatty Acids
… were therefore derivatized in an effort to favor monodentate coordination. Acylphosphine ligands, which are readily synthesized from fatty acids, were of particular interest due to the long phosphorus carbonyl bond distance relative to the oxygen carbonyl bond distance in carboxylates. Initial …
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Earth-Abundant Metal Complexes Binding N-Heterocyclic Carbene-Based Ligands for the Photocatalytic Carbon Dioxide Reduction Reaction
… (OMe, Me, H) para to the pyridine ring. A monodentate chloride ligand was also incorporated into this metal complex, forming a four-coordinate nickel complex. These nickel complexes were utilized as catalysts for the photocatalytic CO2 reduction reaction, yielding formate as the major …
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Labile Ligand Variation in Polyazine-Bridged Ruthenium/Rhodium Supramolecular Complexes Providing New Insight into Solar Hydrogen Production from Water
… photochemical properties upon variation of the monodentate, labile ligands coordinated to the Rh reactive metal center were investigated. Bimetallic complexes [(Ph2phen)2Ru(dpp)RhX2(Ph2phen)]3+ (Ph2phen = 4,10-diphenyl-1,10-phenanthroline; dpp = 2,3-bis(2-pyridyl)pyrazine; X = Br- or Cl-) were …
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Synthesis and application of chiral phosphorous triamide ligands
… the synthesis and application of novel chiral monodentate phosphorous triamide (PTA) ligands is presented. First, a small library of chiral PTAs based on three different chiral diamine backbones has been prepared through a convenient modular synthetic approach. The study significantly increases …
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High oxidation state organometallic and coordination chemistry: The synthesis and reactivity of nitridoosmium(VI) thiolates and alkoxides
… 3. Reactions of this solvate complex with monodentate, anionic ligands yield binuclear or trinuclear complexes, whereas reactions with multidentate and facially-coordinant, anionic ligands, such as indenyl and tris(pyrazolyl)borate, yield mononuclear complexes. The synthesis of several …
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Interactions of ionic liquids with uranium and its implications on biotransformation
… (EXAFS) analysis showed the formation of monodentate complexes between uranium and [BMIM][PF_6][EtPy][BF_4] and a biodentate complex with [EtPy][CF_3COO]. The effects of ionic liquids on the growth of anaerobic bacterium Clostridium sp. were measured by changes in optical density, pH, and …
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