The preparation, X-ray structure, and detailed physical characterization are presented for a new type of single-molecule magnet [Mn4(O2CMe)2(pdmH)6](ClO4)2 (1). Complex 1.2MeCN.Et2O crystallizes in the triclinic space group P1, with cell dimensions at 130 K = 11.914(3) A, b 15.347(4) c 9.660(3) alpha 104.58(1) degree, beta 93.42(1) gamma 106.06(1) Z 1. cation lies on an inversion center consists planar Mn4 rhombus that is mixed-valent, MnIII2MnII2. pdmH- ligands (pdmH2...

A series of Ni(4) cubane complexes with the composition [Ni(hmp)(ROH)Cl](4) 1-4 where R= -CH(3) (complex 1), -CH(2)CH(3) 2), -CH(2)CH(2)(C(4)H(9)) 3), -CH(2)CH(2)CH(2)(C(6)H(11)) 4), hmp(-) is anion 2-hydroxymethylpyridine, t-Buhmp(-) 4-tert-butyl-2-hydroxymethylpyridine, and dmb 3,3-dimethyl-1-butanol] [Ni(hmp)(dmb)Br](4) 5) [Ni(t-Buhmp)(dmb)Cl](4) 6) were prepared. All six characterized by dc magnetic susceptibility data to be ferromagnetically coupled give an S = 4 ground state...

Two-dimensional metal–organic frameworks (2D MOFs) have attracted much attention, as they are the crystalline materials that exhibit both conductivity and microporosity. Numerous efforts been made to advance their application chemiresistive sensors or electrochemical capacitors. However, intrinsic physical properties spin states of these remain poorly understood. Most 2D MOFs possess a honeycomb lattice, with Kagomé lattice arrangement metal cations. These structural characteristics suggest...

The preparations, X-ray structures, and detailed physical characterizations are presented for two new mixed-valence tetranuclear manganese complexes that function as single-molecule magnets (SMM's): [Mn4(hmp)6Br2(H2O)2]Br2-4H2O (2) [Mn4(6-me-hmp)6Cl4]-4H2O (3), where hmp(-) is the anion of 2-hydroxymethylpyridine 6-me-hmp(-) 6-methyl-2-hydroxymethylpyridine. Complex 2-4H2O crystallizes in space group P2(1)/c, with cell dimensions at -160 degrees C a = 10.907(0) A, b 15.788(0) c 13.941(0)...

In this paper we study an organic system of geometrical spin frustration. m-N-methylpyridinium \ensuremath{\alpha}-nitronyl nitroxide (m-${\mathrm{MPYNN}}^{+}$) is a spin-1/2 radical. The simple salt, m-${\mathrm{MPYNN}}^{+}$\ensuremath{\cdot}${\mathrm{ClO}}_{4}^{\mathrm{\ensuremath{-}}}$\ensuremath{\cdot}1/3 (acetone), crystallizes in trigonal P3c1 space group, where the m-${\mathrm{MPYNN}}^{+}$ molecules exist as dimer and units form two-dimensional (2D) triangular lattice. One-third...

The sulfur–nitrogen radical p-O2NC6F4CNSSN. (see packing diagram) provides a rare example of an organic that orders ferromagnetically above 1 K. It is suggested the near orthogonal nature singly occupied molecular orbitals neighboring molecules important for such behavior to be observed. Supporting information this article available on WWW under http://www.wiley-vch.de/contents/jc_2002/2003/z52194_s.pdf or from author. Please note: publisher not responsible content functionality any...

Information on the liquefaction and liquefaction-induced damage in Tohoku district during 2011 off Pacific Coast of Earthquake has been compiled. The this report was mainly identified by sand boils. It caused to earth structures residential houses, as well uplift manholes. A comparison geological maps aerial photos, before after earthquake, shows that many liquefied sites were old river beds developed areas. Liquefaction tsunami-affected areas difficult identify evidence had washed away...

The correlation between free-exciton and bound-exciton recombination has been investigated by cathodoluminescence in high-quality impurity-controlled chemical-vapor-deposited (CVD) diamond films. films are formed [CO(5%)]/[${\mathrm{H}}_{2}$] using microwave-plasma CVD doped with ${\mathrm{B}}_{2}$${\mathrm{H}}_{6}$ during deposition. In moderately (below 3\ifmmode\times\else\texttimes\fi{}${10}^{18}$ ${\mathrm{cm}}^{\mathrm{\ensuremath{-}}3}$) semiconducting diamonds, the intensity ratio...

The reaction of 2-(hydroxyethyl)pyridine (hepH) with a 2:1 molar mixture [Mn3O(O2CMe)6(py)3]ClO4 and [Mn3O(O2CMe)6(py)3] in MeCN afforded the new mixed-valent (16MnIII, 2MnII), octadecanuclear complex [Mn18O14(O2CMe)18(hep)4(hepH)2(H2O)2](ClO4)2 (1) 20% yield. Complex 1 crystallizes triclinic space group P1̄. Direct current magnetic susceptibility studies 1.0 T field 5.0−300 K range, variable-temperature variable-field dc magnetization 2.0−4.0 2.0−5.0 ranges were obtained on polycrystalline...

Among many two-dimensional (2D) high ${T}_{C}$ superconductors, graphite intercalation compounds (GICs) are the most famous family, which classified as typical electron-phonon mediated superconductors. We show unambiguous experimental facts that ${\mathrm{Ba}\mathrm{C}}_{6}$, superconductivity of has been missing for years so far among various alkaline earth metal (Ca, Sr, and Ba) intercalted GICs, exhibits at ${T}_{C}=65\text{ }\text{ }\mathrm{mK}$. By adding this finding additional point,...

Low temperature properties of the organic spin-1 Kagomé antiferromagnet, m -MPYNN·BF 4 , have been studied by measuring heat capacity and magnetic susceptibility down to 35 mK. The maximum due a short-range order was observed at 1.4 K, which is about half antiferromagnetic interaction 2| J |/ k B =3.1 K in lattice. As decreases, begins decrease below 0.24 K. susceptibilities both parallel perpendicular lattice collapse almost zero lowest temperature, indicates nonmagnetic ground state....

The reaction of 1/3 equivalent CuCl2.2H2O with MnCl2.4H2O and 5-bromo-2-salicylideneamino-1-propanol (H(2)5-Br-sap) in methanol gave dark brown crystals [MnIIICuIICl(5-Br-sap)2(MeOH)] (1). Complex 1 has an alkoxo-bridged dinuclear core MnIII CuII ions, which have elongated octahedral square-planar coordination geometries, respectively. In dc magnetic susceptibility measurements, chi(m)T values increased as the temperature was lowered, followed by a sudden decrease below 20 K. This behavior...

This study investigates the instability issue at a free surface when consistent schemes based on variable differences are applied in semi-implicit particle methods. A semi-analytical error-analysis method is proposed to clarify how incomplete/biased neighbor support triggers error accumulation and instability. Specifically, discretization models decomposed into center-variable components (CVCs) neighbor-variable (NVCs). The influence of different analyzed theoretically numerically. Based...

Abstract The petrologic and mineralogical characteristics alteration processes of the nakhlites NWA 6148 10153 were studied. Both consist augite, olivine, mesostasis. Based on each volume fraction components chemical composition olivine pyroxene, correspond to lava units crystallized at 1346–1391 Ma in nakhlite body. position body is unclear. Iron oxides/hydroxides, barite, calcite fill fractures 6148, which are terrestrial weathering products. In 10153, grains replaced by goethite,...

Magnetic measurements and X-ray crystal analyses were carried out on iodide salts of p-N-alkylpyridinium α-nitronyl nitroxides [4-(4,4,5,5-tetramethyl-1-oxido-3-oxyl-4,5-dihydro-3H-imidazol-2′-yl)-1-R-pyridinium, with R = methyl (1+), ethyl (2+), n-propyl (3+) n-butyl (4+)]. The strongly antiferromagnetic 1+·I– consists a radical dimer the ion is plane pyridinium ring. 2+·I–, which weakly antiferromagnetic, includes two crystallographically independent molecules, 2A+ 2B+, each forms...

In this study, we investigate the magnetoelectric (ME) effect of newly discovered antiferromagnetic (AFM) compound Ce$_{3}$TiBi$_{5}$ with a hexagonal structure (space group $P6_{3}$/$mcm$). system, Ce ions form zig-zag chains that extend along $c$-axis. We focus on lack local inversion symmetry at site, although crystal has an center. A theoretical study predicted magnetization can be induced by electric current in AFM ordering chain. conducted measurements under applied constant and static...

Abstract Sample return missions have provided the basis for understanding thermochemical evolution of Moon. Mare basalt sources are likely to originated from partial melting lunar magma ocean cumulates after solidification an initially molten state. Some Apollo mare basalts show evidence presence in their source a late-stage radiogenic heat-producing incompatible element-rich layer, known its enrichment potassium, rare-earth elements, and phosphorus (KREEP). Here we most depleted meteorite,...

Abstract— We have investigated 10 new specimens of the Millbillillie eucrite to study its textures and mineral compositions by electron probe microanalyser scanning microscope. Although originally described as having fine‐grained texture, show diversity texture. The (Mg/Fe ratios) host pigeonites augite lamellae are homogeneous, respectively, in spite textural variation. In addition their chemical homogeneity, pyroxenes coarse clasts partly inverted orthopyroxene. Chemical zoning plagioclase...

A layered ternary carbide Ti3AlC2 was synthesized by pressureless calcining process from the mixture of titanium, aluminum and graphite powders. Almost single-phase obtained after at 1400°C for 4 h. The microstructural evolution during formation examined temperature 900°C to 1400°C. formed through an intermediate Ti3AlC, which seldom reported in previous literatures. Based on results X-ray diffraction (XRD) energy-dispersive spectroscopy (EDS), a possible reaction mechanism proposed explain Ti3AlC2.

Learning from serendipitous assembly, we have prepared a new family of designed 3d-4f Mn6Ln complexes. The dynamics relaxation the magnetization via alternating-current magnetic susceptibility for complexes 1 (Ln = La), 2 Tb), and 4 Dy) been studied down to 0.2 K.