Materials Literature
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The synthesis and characterization of a series of [RTt] 2 M (RTt - = tetrakis((methylthio)methyl)borate; M = Fe, Co, Ni) complexes are reported. Isostructural derivatives of the newly synthesized phenyltris((methylthio)methyl)borate (PhTt - ) also have been prepared and characterized. In each case, the ligand provides…
EPR and FTIR have been used to obtain information on the oxygen adsorption sites generated on CeO2/γ-Al2O3 samples by outgassing treatments at different temperatures. Several types of O2– species, showing EPR signals with different line shapes, have been detected depending on the type of surface sites where the radica…
Two ruthenium nitrosyl porphyrins have been synthesized and characterized by spectroscopic and electrochemical methods. The investigated compounds are represented as [(TPP)Ru(NO)(H(2)O)]BF(4) and (TPP)Ru(NO)(ONO) where TPP is the dianion of 5,10,15,20-tetraphenylporphyrin. (TPP)Ru(NO)(ONO) crystallizes in the tetragon…
Two new nickel(II) bridging-cyanate complexes of formula [{Ni(323-tet)(µ-OCN)}n][ClO4]n1[323-tet =N,N′-bis(3-aminopropyl)ethane-1,2-diamine] and [{Ni(Me6[14]aneN4)}2(µ-OCN)2][ClO4]22(Me6[14]aneN4=DL-5,5,7,12,12,14-hexamethyl-1,4,8,11-tetraazacyclotetradecane) have been synthesized and characterized. The crystal struct…
Phosphorus-containing dendrimers 1-[G'(1)]-1-[G'(4)] (generation 1 to generation 4) possessing terminal aldehyde groups reacted with a variety of hydrazino compounds. Addition of hydrazine itself to 1-[G'(1)]-1-[G'(4)] afforded the corresponding dendrimers 2-[G(1)]-2-[G(4)] with hydrazono groups at the periphery. Addi…
Both the 77 K single crystal absorption and 20 K emission spectrum of (&mgr;-1,1-dicyanoethylene-2,2-dithiolato-S,S')bis(triphenylphosphine)digold(I), (AuPPh(3))(2)[i-MNT], show resolved vibronic structure. Progressions in the 1410 cm(-)(1) C=C stretching mode of the dithiolate ligand, and in the 480 cm(-)(1) mode, wh…
beta-Mono-, tetra-, and octasubstituted tetramesitylporphyrins were prepared in good yields by Suzuki cross-coupling reactions of beta-bromotetramesitylporphyrins with aryl- and alkylboronic acids.
The synthesis and structure determinations of lanthanum, samarium, ytterbium, and lutetium complexes of 5,11,17,23-tetra-tert-butyl-25,27-bis((diethylcarbamoyl)methoxy)-26,28-dihydroxycalix[4]arene (L) are described. The four structures display similar characteristics with the trivalent lanthanide cation being encapsu…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTMolecular Recognition via Hydroquinone−Quinone Pairing: Electrochemical and Singlet Emission Behavior of [5,10,15-Triphenyl-20-(2,5-dihydroxy- phenyl)porphyrinato]zinc(II)−Quinone ComplexesFrancis D'SouzaView Author Information Department of Chemistry The Wichita State…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTSynthesis of Biomimetic Heme Precursors: The "Double Picket Fence" 5,10,15,20-Tetrakis(2',6'- dinitro-4'-tert-butylphenyl)porphyrinEric Rose, Alain Kossanyi, Mélanie Quelquejeu, Michèle Soleilhavoup, Frédéric Duwavran, Nicolas Bernard, and Alexandra LecasView Author In…
Methylviologen adsorbed on a roughened silver electrode is reduced to its cation radical upon irradiation with laser light at liquid nitrogen temperature. Surface-enhanced Raman scattering (SERS) spectra were obtained with different excitation wavelengths between 406 and 752 nm and compared to those obtained at room t…
The addition of [N(CH(3))(4)]OH to a methanolic solution of FeCl(3) and thme (thme = 1,1,1-tris(hydroxymethyl)ethane) yielded [N(CH(3))(4)](2)[OFe(6)(H(-)(3)thme)(3)(OCH(3))(3)Cl(6)].2H(2)O (1). Crystal data: C(26)H(64)Cl(6)Fe(6)N(2)O(15), trigonal space group P31c, a = 12.459(2) Å, c = 18.077(4) Å, Z = 2. The complex…
The first example of a dimer of corner sharing BO3 and PO4 units, BPO64-, occurs in the title compound. The structure is built of layers of such dimers separated by double layers of isolated PO4 tetrahedra. The cobalt atoms are 6-, 5-, and 4-coordinated by the oxygen.
In ${\mathrm{BaTiO}}_{3}$ the alkali ions Na and K, replacing Ba, lead to acceptor levels about 50 meV above the valence band edge. The structure of these defects can be studied by electron spin resonance, after light induced valence-band holes have been captured at neighboring ${\mathrm{O}}^{2\mathrm{\ensuremath{-}}}…
High-resolution crystallographic data show that Glu 168 and Glu 211 lie on opposite surfaces of the active site from Lys 345. Two different proposals for general base catalysis have emerged from these structural studies. In one scheme, the carboxylate side chains of Glu 168 and Glu 211 are proposed to ionize a trapped…
The structural and dynamic properties of a styrene−isoprene−styrene (SIS) triblock copolymer, with block molecular weights of 10 4, 10 5, and 10 4, respectively, and the matching styrene−isoprene (SI) diblock, with block molecular weights of 10 4 and 5 × 10 4, respectively, are examined in the selective solvent di- n…
A new high-performance device for Raman/absorption simultaneous determination was developed. This was combined with a newly designed microcirculating system and was successfully applied to study intermediates in the reaction of bovine oxidized cytochrome c oxidase (CcO) with hydrogen peroxide under steady state condit…
Peripherally-functionalized porphyrazines of the form M[pz(A n:B 4- n )] (inset 1), where A and B symbolize functional moieties (e.g., a−d in Table 1) fused directly to the β-positions of the pyrroles, have the potential to serve in a wide range of applications. Previously, we reported the synthesis of porphyrazinedi-…
Infiltration of alumina powder compacts by molten copper‐oxygen alloys under controlled oxygen partial pressures has been studied. Spontaneous infiltration occurred for copper alloys containing more than approximately 5 at.% oxygen. Despite supersaturation of the copper with oxygen, no Cu 2 O or interfacial reaction l…
Very low concentrations of D-galactose and D-fructose are bound to a dendrimer containing eight boronic acids and eight anthracene units; the binding events are sensitively monitored by changes in the fluorescence intensity.