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Страна 1 од 372 резултати
Opposing influences of ruffling and doming deformation on the 4-N cavity size of porphyrin macrocycles: the role of heme deformations revealed.
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Ruffle- and dome-type porphyrins were developed as model systems to investigate the role of deformation mode and degree of distortion in heme. Their crystal structures revealed that as the degree of distortion increases, cavity size can be contracted in the ruffle mode and expanded in the dome mode,
Porous chitosan-supported metal tetra(4-carboxyphenyl)porphyrin as a practical model for the hydrophobic pocket/cavity of cytochrome P-450 enzyme.
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The objective of this study was to investigate porous chitosan-supported metal tetra(4-carboxyphenyl)porphyrin [Me TCPP/p-CTS] as a practical model for the structure and function of the hydrophobic pocket cavity in cytochrome P-450 enzyme. Porous and non-porous chitosan-supported Me TCPPs [Me
Cyclic Bis-porphyrin-Based Flexible Molecular Containers: Controlling Guest Arrangements and Supramolecular Catalysis by Tuning Cavity Size.
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Three cyclic zinc(II) bis-porphyrins (CB) with highly flexible linkers are employed as artificial molecular containers that efficiently encapsulate/coordinate various aromatic aldehydes within their cavities. Interestingly, the arrangements of guests and their reactivity inside the molecular clefts
π-Extended "Earring" Porphyrins with Multiple Cavities and Near-Infrared Absorption.
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β,β-tripyrrin-bridged earring porphyrins were synthesized through Suzuki-Miyaura cross coupling reactions. These porphyrinoids have multiple cavities and can accommodate two or three metal ions per molecule. The structures of the porphyrins have been elucidated by x-ray diffraction analysis, and
Porphyrin-containing molecular capsules: metal mediated dimerization of a bis-porphyrin cavity.
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[reaction] A self-complementary V-shaped bis-porphyrin cavity has been synthesized that is capable of dimerization to form a capsule structure. Self-assembly of the dimer occurs via metal ion coordination and produces an internal volume for guest encapsulation.
Highly negative homotropic allosteric binding of viologens in a double-cavity porphyrin.
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The synthesis of a double-cavity porphyrin with interesting allosteric binding properties toward viologens (N,N'-disubstituted 4,4'-bipyridines) is described. The porphyrin host forms very strong 1:2 complexes with viologens, displaying a negative allosteric behavior. The first viologen guest binds
Probing the dimensions of semi-rigid inner functionalised U-shaped bis-porphyrin cavities.
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The synthesis of a series of open U-shaped bis-porphyrin cavity molecules is described, with bridged bicyclic backbones to confer rigidity, and a pendant substituted aromatic probe unit suspended on the inside of the cavity. The dimensions and flexibility of the bis-zincporphyrin cavity were probed
DABCO as a dynamic hinge between cofacial porphyrin panels and its tumbling inside a supramolecular cavity.
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The heteroleptic supramolecular double-decker porphyrin 1 was synthesized with DABCO as a guest between two cofacial porphyrin units as characterized by (1)H NMR and ESI-MS. While DABCO is not seen to tumble inside the cavity, even at higher temperatures (80 °C), such motion was triggered upon
Incoherent broadband cavity-enhanced total internal reflection spectroscopy of surface-adsorbed metallo-porphyrins.
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An improvement of conventional attenuated total reflection (ATR) spectroscopy is demonstrated by applying an incoherent broadband light source (short-arc Xe-lamp) in a cavity-enhanced evanescent-wave absorption method. With this novel approach the absorption spectra of several metallo-octaethyl
Properties of a binaphthyl-bridged porphyrin-iron complex bearing hydroxy groups inside its cavity.
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Hydrogen-bond formation with the terminal oxygen atom is considered to be the basis of dioxygen molecule activation by cytochrome P450. In order to verify the effect of this hydrogen bond, we have undertaken the synthesis of a model complex: a binaphthyl-bridged porphyrin bearing hydroxy groups at
Photo-induced electron migrations in the nano-cavities of mesoporous silica sensitized by a cationic porphyrin dye.
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Photo-induced redox reactions in a hybrid film of a cationic porphyrin dye (H2TMPyP) accommodated within a transparent mesoporous silica (MPS) film spin-coated on an FTO electrode have been investigated for such applications as the construction of efficient solar energy storage devices and novel
Chiral porphyrin dimer with a macrocyclic cavity for intercalation of aromatic guests.
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Chiral diporphyrin receptor 1, which has a macrocyclic cavity to sandwich aromatic guest molecules via double π-π stacking interactions, enabled the naked-eye detection of an aromatic explosive as well as chiral discrimination in NMR.
D3h -Symmetric Porphyrin-Based Rigid Macrocyclic Ligands for Multicofacial Multinuclear Complexes in a One-Nanometer-Sized Cavity.
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The one-step synthesis of D3h -symmetric cyclic porphyrin trimers 1 composed of three 2,2'-[4,4'-bis(methoxycarbonyl)]bipyridyl moieties and three porphyrinatozinc moieties was achieved from a nickel-mediated reductive coupling of meso-5,15-bis(6-chloro-4-methoxycarbonylpyrid-2-yl)porphyrinatozinc.
Iron porphyrins with a hydrogen bonding cavity: effect of weak interactions on their electronic structure and reactivity.
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The electronic structure and reactivity of iron porphyrin complexes bearing 2nd sphere hydrogen bonding residues have been investigated over the last few years. The presence of these weak interactions alters the spin ground state, and axial ligand bonding and provides a proton translocation pathway
Coordinative self-assembly and solution-phase X-ray structural characterization of cavity-tailored porphyrin boxes.
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Combining linear Zn porphyrin trimers with orthogonally derivatized porphyrin dimers leads rapidly and spontaneously to the formation of monodisperse, torsionally constrained boxes comprising six components and a total of 16 metalloporphyrins. In situ X-ray scattering measurements confirm the
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