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Showing 1 to 14 of 14 for “"Cubane"”.
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Dye-sensitized cobalt cubane: ultrafast photophysics probed by transient XUV spectroscopy
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-04-12 without embargo terms
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Mechanochemical Reaction Development for Addition, Elimination, and Isomerization
… report the mechanically driven isomerization of cubane, a compound of longstanding fascination to chemists due to its structure, symmetry, and strain. The mechanical coupling is explored at three regiochemical dispositions: ortho, meta and para. In contrast to the fact that all compounds can be …
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Ligand Design for Dual Property Single Molecule Magnets
… crystallizes in a distorted cubane topology that is well known in Ni(II) cluster chemistry. The final two Co(II) complexes crystallize as a linear mixed valence trimer with stoichiometry [Co3(mpm)6]·(ClO4)2, and a Co4 mixed valence complex …
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Characterization of tetranuclear manganese complexes and thermochromic copper(II) and nickel(II) complexes
… complexes, based upon x-ray crystallography are cubane like structures containing a single manganese ion with a +4 oxidation state and three manganese ions with an oxidation state of +3. Based upon magnetic susceptibility measurements and high magnetization experiments the complexes were found to …
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New routes to single molecule magnets
… nickel(II). The cobalt(II) compounds incorporate cubane structural motifs that are of particular interest for the generation of single molecule magnet (SMM) behaviour. The product family includes a Co4 SMM cluster, a Co6 SMM cluster and a 3D network of linked SMM units. A new route to the …
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Model complexes for active sites of diiron metalloproteins, dioxygen reactivity and water effects
(cont.) tetrairon(II) cubane complex was identified and structurally characterized. Chapter 4: Synthesis and Characterization of [Fe₂...CR)]³⁺ and [Fe₂...CR)]³⁺ Complexes with Carboxylate-Rich Metal Coordination Environment as Models for Diiron Centers in Oxygen-Dependent Non-Heme Enzymes. …
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Coordination chemistry of cis,trans-1,3,5-Triaminocyclohexane : from mononuclear complexes to supramolecular architectures
… Protonated CuF\(_2\) forms a tetranuclear cubane type structure that aggregates into a 3-D nanoporous network via hydrogen-bonded interactions. Protonation of the CuSO\(_4\) diligand complex maintains the diligand coordination, forming a 1-D nanoporous network through hydrogen-bonded …
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Development and characterization of chemical modifications for siRNA strand selection
… linkers, triazole-bound folate linkers, cubane linkers, hydrophobic phosphotriester modifications, or a 5’ phosphorofluoridate. Antisense vs. sense strand profiles revealed that nucleic acid substitutions (linkers) tend to reduce overall potency, likely due to an altered helical …
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Investigating the Cluster Chemistry of α-Methyl-2-pyridine methanol (mpmH) with Select 3d Ions
… disordered comprising of eight edge-sharing cubane subunits. Dc magnetic susceptibility measurements reveal dominant ferromagnetic interactions down to ~18 K, stabilizing spin states with large values, whereas at T < 18 K the antiferromagnetic contribution results in the population of …
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Towards Multifunctional Materials based on Coordination Complexes of Sulfur-Containing Diarylazo and Cucurbit[6]uril Ligands
… explores the hydrothermal synthesis of Ln4-cubane sandwich-type structures from cucurbit[6]uril and isonicotinate together with suitable Ln3+ salts. A family of complexes with two structural topologies were isolated; [Gd4(µ3-OH)4(µ2-OH)4] (8a) and [Ln4(μ3- OH)4(μ2-OH)(µ2-IN)] (where Ln3+= Dy …
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SECONDARY INTERACTIONS WHICH MODIFY REDOX AND OTHER PROPERTIES OF ORGANOMETALLIC SYSTEMS
… systems. For example, the redox potentials of cubane iron-sulfur clusters in a redox protein or enzyme can range between -700mV and -400mV versus the standard hydrogen electrode as a consequence of the nature of the second-coordination sphere environment. Whilst this is largely explained in …
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Synthesis, antimicrobial activity, and catalytic activity of rhodium and iridium piano stool complexes: Teaching an old dog new tricks
… trifluoroacetate (TFA) anion and a [Cp*Ir]3Na1O4 cubane structure, which is an unprecedented and highly unusual arrangement for iridium. Attempts to synthesize this cluster rationally through reactions of [Cp*IrCl2]2 with TFA yielded instead a chloro bridged [Cp*IrCl(TFA)] dimer. Reaction of …
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The P Cluster of the Azotobacter vinelandii Nitrogenase Complex: Effects of Substitution at the Cluster-bridging Residue, a-Cys88
… and/or perturbing the conformation of the double-cubane structure by virtue of their bridging positions. It was found that three out of ten bacterial strains with substitutions at the a-Cys88 ligand retained significant catalytic activity. We investigated the effects of these substitutions on the …
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Spectroscopic studies on hydrogenases
… “standard” [NiFe]-hydrogenases, which harbour a cubane-like [4Fe4S] cluster in the proximity of the [NiFe] active site, in oxygen tolerant MBH’s, such as ReMBH, two conserved cysteines in the first coordination sphere of this cofactor lead to the formation of an unusual [4Fe3S]-proximal cluster. …