Flexible porous coordination polymers containing amide groups as a function origin have been synthesized and categorized "Coordination Polymer with Amide Groups". Bispyridyl ligands spacer of group afford two-dimensional (2-D) motifs deformed square grid, resulting in three-dimensional (3-D) frameworks [Co(NO3)2(3-pna)2]n (1), [Co(Br)2(3-pna)2]n (2), {[Co(NCS)2(4-peia)2]·4Me2CO}n (3 ⊃ 4Me2CO) (3-pna = N-3-pyridylnicotinamide, 4-peia N-(2-pyridin-4-yl-ethyl)-isonicotinamide), where the 2-D...

The multicomponent system of [Fe(dpp)2][Ni(mnt)2]2·MeNO2 (1; dpp = 2,6-bis(pyrazol-1-yl)pyridine and mnt maleonitriledithiolate) was prepared by the reaction [Fe(dpp)2](BF4)2 with (Bu4N)[Ni(mnt)2] in MeNO2. Variable-temperature X-ray structural analyses, magnetic susceptibility, heat capacity measurements confirmed that 1 undergoes multiple spin-state conversions both cationic anionic components. asymmetric unit crystal contains one [Fe(dpp)2]2+ cation, two [Ni(mnt)2]− anions ([Ni1]−...

Recent studies on two aspects of silica glass as a photonic material will be described. Part A this review focused structural disorder and relaxations in glass. With regard to the disorder, investigations have been made improve transparency shift optical absorption edge ultraviolet towards shorter wavelengths. Remarkable advances achieved understanding both light scattering, which is dominant factor losses fibers, edge. Freezing was observed, are found important for improving transparency,...

Nanoscale molecular rotors that can be driven in the solid state have been realized Cs2([18]crown-6)3[Ni(dmit)2]2 crystals. To provide interactions between motion of rotor and electronic system, [Ni(dmit)2]- ions, which bear one S = 1/2 spin on each molecule, were introduced into crystal. Rotation [18]crown-6 molecules within a Cs2([18]crown-6)3 supramolecule above 220 K was confirmed using X-ray diffraction, NMR, specific heat measurements. Strong correlations observed magnetic behavior...

Three new coordination polymers, [CoCl2(4-pmna)2]n (1), {[Co(NCS)2(4-pmna)2]·2Me2CO}n (2 ⊃ 2Me2CO), and {[Co(4-pmna)2(H2O)2](NO3)2·2CH3OH}n (3 2H2O·2MeOH) (4-pmna = N-(pyridin-4-ylmethyl)nicotinamide), have been synthesized characterized using single-crystal X-ray diffraction. The cobalt(II) atoms are bridged by 4-pmna ligands in all three compounds to form double-stranded one-dimensional "repeated rhomboid-type" chains with rectangular-shaped cavities. In 1, each chain slips obstructs the...

Abstract New kinds of fullerenes were separated by HPLC with benzene from carbon soot. At least four fractions well separated. Mass analysis confirmed the separation C60, C70, C84 and mixture C76 C78. Absorption spectra C76, C78, measured for first time.

It is shown that in fixing the crossed Nicols positions a systematic error must invariably be introduced caused by parasitic ellipticities of polarizer and analyzer refraction light beam specimen. A method has been derived which this can removed from original HAUP method. The improved successfully applied to measurement temperature dependence gyration-tensor component g23 [N(CH3)4]2ZnCl4, although it as small 10−7. study optical activity shows directly order parameter incommensurate phase...

Heat capacities of liquid, stable crystal, and liquid-quenched glass a room-temperature ionic liquid (RTIL), 1-hexyl-3-methylimidazolium bis(trifluromethylsulfonyl)imide were measured between 5 310 K by adiabatic calorimetry. capacity the at 298.15 was determined for an IUPAC project as (631.6 ± 0.5) J K-1 mol-1. Fusion observed Tfus = 272.10 crystalline phase, with enthalpy entropy fusion 28.34 kJ mol-1 104.2 mol-1, respectively. The purity sample estimated 99.83 mol % fractional melting...

Cyanide-bridged metal complexes of [Fe(8)M(6)(μ-CN)(14)(CN)(10)(tp)(8)(HL)(10)(CH(3)CN)(2)][PF(6)](4)⋅n CH(3)CN⋅m H(2)O (HL=3-(2-pyridyl)-5-[4-(diphenylamino)phenyl]-1H-pyrazole), tp(-) =hydrotris(pyrazolylborate), 1: M=Ni with n=11 and m=7, 2: M=Co n=14 m=5) were prepared. Complexes 1 2 are isomorphous, crystallized in the monoclinic space group P2(1)/n. They have tetradecanuclear cores composed eight low-spin (LS) Fe(III) six high-spin (HS) M(II) ions (M=Ni Co), all which bridged by...

To confirm the molten state of alkyl chain in soft crystalline phase, smectic E (SmE) thermodynamic and spectroscopic analyses were performed on 4-n-alkyl-4'-isothiocyanatobiphenyl (nTCB, n: number carbon atoms group). DSC results 11TCB 12TCB, having extra A phase besides show that their chain-length dependence entropies transition (Δ(trs)S) from ordered (OC) to SmE matches trend found for nTCB (n = 4-10), while no is observed Δ(trs)S at SmE-to-SmA SmA-to-isotropic liquid (IL) transitions...

Water is considered integral for the stabilization and function of proteins, which has recently attracted significant attention. However, microscopic aspects water ranging up to second hydration shell, including strongly weakly bound at sub-nanometer scale, are not yet well understood. Here, we combined terahertz spectroscopy, thermal measurements, infrared spectroscopy clarify how changes upon protein denaturation. With denaturation, that is, exposure hydrophobic groups in entanglement...

The roles played by the conformational disordering of alkyl chains in determining aggregation states matter are reviewed for liquid crystalline materials from a thermodynamic perspective. Entropy, which is one most macroscopic concepts but has clear microscopic meaning, provides crucial information complex systems description hard to establish. Starting structural implication absolute (third-law) entropy solids, existence successive phase transitions caused melting discotic mesogens...

Abstract We discovered a new organic superconductor, (DMET)2Au(CN)2, which is radical salt of an asymmetrical donor. The room-temperature conductivity this was very high (2500 S·cm−1) at ambient pressure. This showed metal-insulator transition about 25 K pressure, but it exhibited superconductivity below 0.80 5 kbar.

To study the relation between structural characteristics and phonon property in negative thermal expansion (NTE) compounds, heat capacities of Sc2W3O12 Sc2Mo3O12 were measured. Spectrum analysis capacity provided their effective densities states (DOS). The DOS shows three features; low-energy modes with mode-Grüneisen parameter (γi) around 5 meV, high-energy modes, separation into two regions a wide gap. relative contribution γiCi, where Ci is each vibrational mode i, reveals that γi cause...

To understand the role of intramolecular degrees freedom in forming mesophases, thermodynamic analysis was performed for 4-n-alkyl-4′-isothiocyanatobiphenyl (nTCB, n is number carbon atoms alkyl group), which exhibits crystal E (CrE) phase as a mesophase. The heat capacities 2TCB and 5TCB were measured by adiabatic calorimetry. Their entropies transition (ΔtrsS) compared with those other nTCBs (n ≤ 10). ΔtrsS from ordered to CrE increased their chain length, whereas that fusion remained...

The world of applied linguistics and the profession foreign language teaching needs to finally sweep away notion "Native Speaker" (NS) deficit perspective surrounding learners. We argue that Positive Psychology is a source inspiration for new more positive on learners users. Rather than obsessing about negative aspects life, Psychologists defend holistic perspective. By transforming view as failed "NS" target increasingly competent happy users would lift huge burden from shoulders their...

Temperature dependence of heat capacities organic superconductors, $\ensuremath{\kappa}\ensuremath{-}{(\mathrm{B}\mathrm{E}\mathrm{D}\mathrm{T}\ensuremath{-}\mathrm{T}\mathrm{T}\mathrm{F})}_{2}{\mathrm{Cu}[\mathrm{N}(\mathrm{CN})}_{2}]X (X=\mathrm{Br}$ and Cl), was measured by chopped-light ac calorimetry between 10 300 K. A small anomaly clearly detected at the superconducting transition in Br salt. For Cl salt, a slight observed 45 K where spin-density wave-like previously suggested to...