Guest-cage atomic interactions in a clathrate-based phase-change material.

New clathrate-based phase-change materials with cage-like structures incorporating Cs and Ba guest atoms, are reported as a means of altering crystallization and amorphization behavior by controlling 'guest-cage' interactions via intra-complex guest vibrational effects. Both a high resistance to spontaneous crystallization, and long retention of the amorphous phase are achieved, as well as a low melting energy. This approach provides a route for achieving cage-controlled semiconductor devices.

Bis(ethanamidinium) (1,10-phen-an-thro-line-2,9-dicarboxyl-ato)manganate(II) hepta-hydrate.

In the title complex, (C2H7N2)2[Mn(C14H6N2O4)2]·7H2O, the Mn(II) atom is coordinated by four N atoms and four O atoms from two 1,10-phenanthroline-2,9-dicarboxyl-ate ligands in a distorted dodeca-hedral geometry. The double negative charge is balanced by two ethanamidinium cations. A three-dimensional supra-molecular structure is formed through N-H⋯O and O-H⋯O hydrogen bonds and π-π stacking inter-actions [centroid-centroid distance = 3.

[Emulsion liquid membrane extraction with D2EHPA mobile carrier Hirudinaria manillensis hirudin in experimental study].

Objective: To study the extraction system of hirudin emulsion liquid membrane with the Poecilobdella manillensis as raw material, di-(2-ethylhexyl) phosphate (D2EHPA) as carrier, Span 80 as emulsifier, octane and D2EHPA mixed to constitute membrane solution, diluted HCl solutions as internal aqueous phase.

Method: Using the orthogonal experiment to optimize the extraction conditions of hirudin reference substance such as membrane phase, internal aqueous phase volume ratio (MIPVR), external aqueous phase pH, internal aqueous phase pH, mobile carrier concentration and so on, and then using hirudin crude extracts to do purifying experiment, and gaining experimental samples.

Result: The optimal conditions of hirudin extraction were as follows: MIPVR 10: 3, internal aqueous phase pH 2.

5H-Imidazo[4,5-f][1,10]phenanthroline.

The title mol-ecule, C(13)H(8)N(4), is is essentially planar [r.m.s.

5-[4-(1H-Imidazol-1-yl)phen-yl]-1H-tetra-zole.

In the title compound, C(10)H(8)N(6), the tetra-zole and benzene rings are close to being coplanar [dihedral angle = 9.90 (16)°], but the imidazole ring is rotated 37.18 (09)° out of the benzene plane.

catena-Poly[(trans-diaqua-cadmium)-bis-{μ-5-[4-(1H-imidazol-1-yl)phen-yl]tetra-zol-1-ido}].

In the title compound, [Cd(C(10)H(7)N(6))(2)(H(2)O)(2)], the Cd(II) atom lies on an inversion centre and is coordinated by four N atoms from 5-[4-(1H-imidazol-1-yl)phen-yl]tetra-zol-1-ide ligands and two O atoms from the coordinated water mol-ecules in an octa-hedral arrangement. The complex polymeric chains are inter-connected via inter-molecular water O-H⋯N hydrogen bonds into a three-dimensional network.

catena-Poly[(diaqua-strontium)-bis-{μ-5-[4-(1H-imidazol-1-yl)phen-yl]tetra-zolido}].

In the title complex polymer, [Sr(C(10)H(7)N(6))(2)(H(2)O)(2)](n), the Sr(II) atom lies on an inversion centre and is coordinated by four N atoms from two bidentate bridging trans-related 5-[4-(1H-imidazol-1-yl)phen-yl]tetra-zolide ligands [Sr-N = 2.387 (4) Å for the tetrazolide moiety and Sr-N = 2.273 (5) Å for the imidazole moiety], and by two O atoms from water mol-ecules [Sr-O = 2.

Tetra-aqua-bis-[4-(1H-imidazol-1-yl-κN(3))benzoato]cobalt(II).

In the title compound, [Co(C(10)H(7)N(2)O(2))(2)(H(2)O)(4)], the Co(II) atom lies on an inversion centre and displays a slightly distorted octa-hedral geometry. The coordination sphere is defined by two mutually trans N atoms from two 4-(imidazol-1-yl)benzoate ligands and the O atoms from four water mol-ecules. The crystal structure is stabilized by O-H⋯O hydrogen bonds.

cis-Tetra-aqua-bis-{5-[4-(1H-imidazol-1-yl-κN(3))phen-yl]tetra-zolido}manganese(II) dihydrate.

In the title compound, [Mn(C(10)H(7)N(6))(2)(H(2)O)(4)]·2H(2)O, the Mn(2+) lies on a twofold rotation axis and is six-coordinated by two N atoms from the cis-related monodentate 5-[4-(imidazol-1-yl)phen-yl]tetra-zolide ligands and four O atoms from the coordinated water mol-ecules. The complex mol-ecules are connected via water O-H⋯O and O-H⋯N hydrogen bonds and weak π-π stacking inter-actions between the benzene rings [minimum ring centroid separation = 3.750 (6) Å] into a three-dimensional polymeric structure.

Diaqua-bis-(5-carb-oxy-2-ethyl-1H-imidazole-4-carboxyl-ato-κ(2)N(3),O(4))cobalt(II) trihydrate.

In the title compound, [Co(C(7)H(7)N(2)O(4))(2)(H(2)O)(2)]·3H(2)O, the Co(II) cation, located on an inversion center, is N,O-chelated by two 5-carboxy-2-ethyl-1H-imidazole-4-carboxylate anions and further coordinated by two water mol-ecules in a distorted octa-hedral geometry. Only one carboxy group of the anion is deprotonated, and the two carboxyl groups of the same anion are linked via an intra-molecular O-H⋯O hydrogen bond. One of the lattice water mol-ecules is located on an inversion center, its H atom equally disordered over two positions.

Diaqua-bis-(5-carb-oxy-2-propyl-1H-imidazole-4-carboxyl-ato-κN,O)cadmium N,N-dimethyl-formamide disolvate.

In the title complex, [Cd(C(8)H(9)N(2)O(4))(2)(H(2)O)(2)]·2C(3)H(7)NO, the six-coordinate Cd(II) ion is in a slightly distorted octa-hedral environment, defined by two O atoms from two coordinated water mol-ecules and two carboxyl-ate O atoms and two N atoms from two N,O-bidentate 5-carb-oxy-2-propyl-1H-imidazole-4-carboxyl-ate ligands. In the crystal, complex mol-ecules and dimethyl-formamide solvent mol-ecules are linked by O-H⋯O and N-H⋯O hydrogen bonds into a two-dimensional supra-molecular structure. The propyl groups of the ligands are disordered over two conformations with refined occupancies of 0.

catena-Poly[[diaqua-strontium]-bis-(μ-quinoline-3-carboxyl-ato)].

The title compound, [Sr(C(10)H(6)NO(2))(2)(H(2)O)(2)](n), contains an eight-coordinate Sr(II) ion displaying a distorted square-anti-prismatic geometry, two quinoline-3-carboxyl-ate ligands and two terminal water mol-ecules. The Sr(II) atom is surrounded by six carboxyl-ate O atoms from four separate quinoline-3-carboxyl-ate ligands and two O atoms from two coordinated water mol-ecules. The bridging carboxyl-ate O atoms [Sr-O = 2.

3-Carb-oxy-5-(pyridinium-4-yl)benzoate: a redetermination.

The title compound, C(13)H(9)NO(4), crystallizes in a zwitterionic form with the pyridine N atom protonated and the carboxyl OH group deprotonated. The benzene and pyridinium rings are inclined with a dihedral angle of 31.42 (14)° between them.

(5,5'-Dimethyl-2,2'-bipyridine-κN,N')(1-naphthyl-acetato-κO)(1-naphthyl-acetato-κO,O')zinc hemihydrate.

In the title compound, [Zn(C(12)H(9)O(2))(2)(C(12)H(12)N(2))]·0.5H(2)O, the water mol-ecule lies on a twofold rotation axis. The Zn(II) atom is coordinated by three O atoms from two 1-naphthyl-acetate ligands, one monodentate and the other asymmetric bidentate chelate, and two N atoms from a 5,5'-dimethyl-2,2'-bipyridine ligand, giving an irregular environment.

2-Ethyl-1H-imidazole-4-carboxyl-ate monohydrate.

In the title compound, C(7)H(8)N(2)O(4)·H(2)O, the imidazole N atom is protonated and one of the carboxyl-ate groups is deprontonated, forming a zwitterion. The two carboxyl groups are are approximately coplanar with the imidazole ring [O-C-C-C torsion angles = -176.8 (2) and 2.

Bis(2,4-dichloro-phen-oxy-acetato-κO,O)(5,5'-dimethyl-2,2'-bipyridine-κN,N')cobalt(II).

In the title compound, [Co(C(8)H(5)Cl(2)O(3))(C(12)H(12)N(2))], the Co(II) atom, lying on a twofold rotation axis, is coordinated by four O atoms from two chelating 2,4-dichloro-phen-oxy-acetate ligands and two N atoms from a 5,5'-dimethyl-2,2'-bipyridine ligand, displaying a distorted octa-hedral geometry. A three-dimensional supra-molecular structure is formed through inter-molecular C-H⋯O hydrogen bonds and π-π stacking inter-actions between the pyridine and benzene rings [centroid-centroid distance = 3.779 (2) Å].

Poly[[[diaqua-sodium]-μ(3)-5-carb-oxy-2-ethyl-1H-imidazole-4-carboxyl-ato-κN,O:O:O] monohydrate].

In the title complex, {[Na(C(7)H(7)N(2)O(4))(H(2)O)(2)]·H(2)O}(n), the Na(I) atom exhibits a distorted octa-hedral geometry and is six-coordinated in an NO(5) environment. The equatorial plane is defined by three O atoms and one N atom from two distinct 5-carb-oxy-2-ethyl-1H-imidazole-4-carboxyl-ate (H(2)EIDC) ligands and one coordinated water mol-ecule, and the apical sites are occupied by one carboxyl O atom from one H(2)EIDC ligand and one O atom from the other coordinated water mol-ecule. The Na(I) atoms are linked by H(2)EIDC ligands, generating an infinite double chain along the a axis.

catena-Poly[hexaaquamagnesium(II) [bis(μ3-5-nitro-2-oxidoisophthalato)dicopper(II)] dihydrate].

In the centrosymmetric dinuclear anions of the title bimetallic complex, {[Mg(H(2)O)(6)][Cu(2)(C(8)H(2)NO(7))(2)]·2H(2)O}(n), each Cu(II) ion is strongly coordinated by four O atoms in a distorted square-planar geometry. Two of these O atoms belong to phenolate groups and the other two to carboxylate groups from 5-nitro-2-oxidoisophthalate (L1) trianions, derived from 5-nitrobenzene-1,2,3-tricarboxylic acid (O(2)N-H(3)L). The phenolate O atoms bridge the two Cu(II) ions in the anion.

Magnetic properties and phase change features in Fe-doped Ge-Sb-Te.

The relationship between magnetic property and phase change features in Fe-doped Ge-Sb-Te has been studied. Fe-doped Ge-Sb-Te is a phase change magnetic material, which exhibits a fast phase change feature and different magnetic, optical and electrical properties between amorphous and crystalline states. However, the crystallization temperature increases and crystallization rate drops with an increase of Fe doping content.

Diaqua-bis-(4-carb-oxy-2-propyl-1H-imidazole-5-carboxyl-ato-κN,O)cobalt(II) N,N-dimethyl-formamide disolvate.

In the title complex, [Co(C(8)H(9)N(2)O(4))(2)(H(2)O)(2)]·2C(3)H(7)NO, the Co(II) cation (site symmetry ) is six-coordinated by two 5-carb-oxy-2-propyl-1H-imidazole-4-carboxyl-ate ligands and two water mol-ecules in a distorted octa-hedral environment. In the crystal structure, the complex mol-ecules and dimethyl-formamide solvent mol-ecules are linked by extensive O-H⋯O and N-H⋯O hydrogen bonding into sheets lying parallel to (21).

catena-Poly[[diaqua-calcium(II)]-bis-(μ-quinoline-3-carboxyl-ato)].

In the title complex, [Ca(C(10)H(6)NO(2))(2)(H(2)O)(2)](n), the Ca(II) ion is eight-coordinated by six carboxyl-ate O atoms from four separate quinoline-3-carboxyl-ate ligands, two of which are bidentate chelate and two bridging, and two water mol-ecules in a distorted square-anti-prismatic geometry. The bridging groups form a polymeric chain substructure extending along the c axis, the chains being connected by coordinated-water O-H⋯N and O-H⋯O(carboxyl-ate) hydrogen bonds into a three-dimensional framework structure.

Hexaaqua-nickel(II) 4,4'-(1,2-dihy-droxy-ethane-1,2-di-yl)dibenzoate monohydrate.

In the title compound, [Ni(H(2)O)(6)](C(16)H(12)O(6))·H(2)O, the Ni(II) cation is located on a mirror plane and is coordinated by six water mol-ecules, two of which are also located on the mirror plane, in a distorted octa-hedral geometry. The 4,4'-(1,2-dihy-droxy-ethane-1,2-di-yl)dibenzoate anion is centrosymmetric with the mid-point of the central ethane C-C bond located on an inversion center. The uncoordinated water mol-ecule is located on a mirror plane.

Diaqua-bis-(5-carb-oxy-2-propyl-1H-imidazole-4-carboxyl-ato-κN,O)cadmium(II) 3.5-hydrate.

In the title complex, [Cd(C(8)H(9)N(2)O(4))(2)(H(2)O)(2)]·3.5H(2)O, the Cd(II) is coordinated by two water mol-ecules and N,O-chelated by two 5-carb-oxy-2-propyl-1H-imidazole-4-carboxyl-ate anions in a distorted octa-hedral geometry. The two imidazole rings are oriented to each other with a dihedral angle of 75.

Diaqua-bis-(5-carb-oxy-2-propyl-1H-imidazole-4-carboxyl-ato-κN,O)manganese(II) 3.5-hydrate.

In the title complex, [Mn(C(8)H(9)N(2)O(4))(2)(H(2)O)(2)]·3.5H(2)O, the Mn(II) cation is six-coordinated by two N,O-bidentate H(2)pimda(-) ligands (H(2)pimda(-) = 5-carb-oxy-2-propyl-1H-imidazole-4-carboxyl-ate) and two water mol-ecules in a distorted octa-hedral environment. The complete solid-state structure can be described as a three-dimensional supra-molecular framework stabilized by a wide range of O-H⋯O and N-H⋯O hydrogen bonds.

Diaqua-bis-(5-carb-oxy-2-propyl-1H-imidazole-4-carboxyl-ato-κN,O)zinc(II) 3.5-hydrate.

In the title complex, [Zn(C(8)H(9)N(2)O(4))(2)(H(2)O)(2)]·3.5H(2)O, the Zn(II) ion is coordinated by two N,O-bidentate H(2)pimda ligands (H(3)pimda = 2-propyl-1H-imidazole-4,5-dicarb-oxy-lic acid) and two water mol-ecules in a distorted octa-hedral environment. In the crystal structure, extensive inter-molecular O-H⋯O and N-H⋯O hydrogen bonds stabilize the three-dimensional supra-molecular network.