{2-Hydr­oxy-6-[(2-oxidophen­yl)imino­methyl-κ2 N,O]phenolato-κO 1}phenyl­boron

The [4.3.0]heterobicyclic title structure, C19H14BNO3, is composed of a five-membered OBNC2 ring and a six-membered OBNC3 ring, each of which has an approximate envelope conformation. The coordination geometry of the B atom is distorted tetra­hedral. In the crystal structure, centrosymmetrically related mol­ecules are associated through pairs of O—H⋯O hydrogen bonds

2,4,5-Tris(pyridin-4-yl)-4,5-dihydro-1,3-oxazole

In the title compound, C18H14N4O, the mol­ecules are disordered about a crystallographic twofold axis, leading to 50:50 disorder of the O- and N-atom sites within the oxazole ring. As a consequence, symmetry-related oxazole C—N and C—O bonds are averaged. The oxazole ring makes a dihedral angle of 6.920 (1)° with the pyridyl ring in the 2-position and 60.960 (2)° with the pyridyl rings in the 4- and 5-positions

3-Amino­phenyl­boronic acid monohydrate

In the title compound, C6H8BNO2·H2O, the almost planar boronic acid mol­ecules (r.m.s. deviation = 0.044 Å) form inversion dimers, linked by pairs of O—H⋯O hydrogen bonds. The water mol­ecules link these dimers into [100] chains by way of O—H⋯O hydrogen bonds, and N—H⋯O links generate (100) sheets

(E)-2-{[2-(2-Hy­droxy­ethyl­amino)­ethyl­imino]­meth­yl}phenol

The asymmetric unit of the title compound, C11H16N2O2, contains two independent conformational isomers which show intra­molecular aromatic–imine O—H⋯N hydrogen bonds. In the crystal, neighboring mol­ecules are linked through inter­molecular aliphatic–aliphatic O—H⋯N, aliphatic–aromatic N—H⋯O and C—H⋯O inter­actions into hydrogen-bonded layers parallel to the ab plane

Dichloridobis(methanol-κO)[cis-(±)-2,4,5-tris­(pyridin-2-yl)-2-imidazoline-κ3 N 2,N 3,N 4]ytterbium(III) chloride

In the crystal structure of the title complex, [YbCl2(C18H15N5)(CH3OH)2]Cl, the pseudo-penta­gonal–bipyramidal coordination geometry of the YbIII cation is composed of three N atoms from one cis-(±)-2,4,5-tris­(pyridin-2-yl)imidazoline (HL) ligand, two O atoms from two methanol mol­ecules and two Cl− anions. Chains are formed along [010] through N—H⋯Cl, O—H⋯Cl and O—H⋯N hydrogen bonds

2,4-Difluoro­phenyl­boronic acid

The mol­ecular structure of the title compound, C6H5BF2O2, is essentially planar (mean deviation = 0.019 Å), indicating electronic delocalization between the dihydroxy­boryl group and the aromatic ring. In the crystal structure, inversion dimers linked by two O—H⋯O hydrogen bonds arise. An intra­molecular O—H⋯F hydrogen bond reinforces the conformation and the same H atom is also involved in an inter­molecular O—H⋯F link, leading to mol­ecular sheets in the crystal

Poly[potassium-μ-2-[2-(carboxymethyl)phenyl]acetato]

In the title salt, [K(C10H9O4)]n, the K+ ions are coordinated by six O atoms from three different anions, and there is a cation–π inter­action at ca 3.14 Å. The 2-[2-(carboxymethyl)phenyl]acetate anions are stabilized by intramolecular O—H⋯O hydrogen bonds, and the K+ cations are linked into one-dimensional coordination polymers running along the b axis; these are further inter­connected by weak C—H⋯O hydrogen bonds

Poly[aqua­bis(μ-benzene-1,2-dicarboxyl­ato)ethano­ltetra­lithium]

In the crystal structure of the title compound [Li4(C8H4O4)2(C2H5OH)(H2O)]n, there are four crystallographically independent metal centers each of which is coordinated by four O atoms. The benzene-1,2-dicarboxyl­ate groups act as bidentate–bridging ligands producing a two-dimensional coordination network parallel to the ab plane. The coordination polymer is further stabilized by coordination of water and ethanol mol­ecules by the Li+ ions. Simultaneously, the water and ethanol mol­ecules are involved in O—H⋯O and C—H⋯π inter­actions

Síntesis y caracterización de dos nuevos cristales multicomponentes derivados de la 2,5-dihidroxi-1,4- benzoquinona con posibles aplicaciones electromagnéticas

En este trabajo se reporta la síntesis y caracterización de dos nuevos cristales multicomponentes derivados de la 2,5-dihidroxi-1,4-benzoquinona (H₂DHB) con bases nitrogenadas tales como el 1,4-diazabiciclo-[2.2.2]-octano (DABCO) y piridina (py). Los compuestos se obtuvieron a través de las técnicas de molienda y cristalización por evaporación lenta del disolvente. La caracterización por difracción de rayos-X de polvos y de monocristal permitió concluir que se obtuvieron 2 nuevas fases cristalinas con posibles aplicaciones electromagnéticas: DHB1, el cual cristalizó en un sistema cristalino monoclínico cuya unidad asimétrica está constituida de una media-molécula de H2DHB, una de DABCO y dos de agua, para formar el compuesto [HDABCO+]₂(DHB₂-).4H₂O; DHB2, cristalizó en un sistema cristalino triclínico y con unidad asimétrica compuesta por una molécula de H₂DHB y una de piridina, para formar el compuesto [Hpy+](HDHB-). Estos nuevos productos también se caracterizaron por espectroscopía IR.In this work we report the synthesis and characterization of two new multicomponent crystals derived from 2,5-dihydroxy-1,4-benzoquinone (H2DHB) with nitrogenous bases such as 1,4-diazabicyclo-[2.2.2]-octane (DABCO) and pyridine (py). Both compounds were obtained through the techniques of grinding and crystallization by slow evaporation of the solvent. Powder and single-crystal Xray diffraction characterization allowed us to conclude that two new crystalline phases with possible electromagnetic applications were obtained: DHB1, which crystallized in a monoclinic system whose asymmetric unit consists of one-half of H₂DHB, one DABCO and two lattice water molecules, affording a new compound with formula [HDABCO+]₂(DHB₂-).4H₂O; DHB2 crystallized in a triclinic system with an asymmetric unit composed of one H2DHB molecule and one pyridine molecule, to form the new compound [HPy+](HDHB-). These new products were also characterized by IR spectroscopy

Bis[3-(dihydroxy­boryl)anilinium] sulfate

In the title compound, 2C6H9BNO2 +·SO4 2−, the dihydroxy­boryl group of one of the two independent boronic acid mol­ecules participates in (B)O—H⋯OB and N—H⋯OB hydrogen bonds, while the second is involved mainly in the formation of the charge-assisted heterodimeric synthon –B(OH)2⋯−O2SO2 −. These aggregates are further connected through N—H⋯Osulfate inter­actions, forming a complex three-dimensional hydrogen-bonded network