Search results for "AH"

Dimensionally controlled hydrogen-bonded nanostructures: synthesis, structure, thermal and magnetic behaviour of the tris-(chelated)nickel(II) comple…

2002

Abstract Single crystals of the compound of formula [Ni(bipy)3]Cl2·5.5H2O (bipy=2,2′-bipyridine) have been prepared and structurally characterised by X-ray diffraction. The structure analysis reveals that the complex has an approximate D3 symmetry. The coordination sphere consists of six nitrogen atoms of the three-bipyridine ligands in an octahedral arrangement about the nickel. One of the chlorine ions is surrounded by twelve CH⋯Cl hydrogen bonds. Three kinds of layers are found in the crystal structure: (i) the Λ-[Ni(bipy)3]2+ cation; (ii) the water/chloride positions (O(1w)/Cl(21) to O(7w)/Cl(27)); (iii) the Δ-[Ni(bipy)3]2+ cation and a chloride ion (Cl(1)). The layers are stacked in t…

A novel series of rhenium-bipyrimidine complexes: synthesis, crystal structure and electrochemical properties

2007

Four novel rhenium complexes of formula [ReCl(4)(bpym)] (1), [ReBr(4)(bpym)] (2) PPh(4)[ReCl(4)(bpym)] (3) and NBu(4)[ReBr(4)(bpym)] (4) (bpym = 2,2'-bipyrimidine, PPh(4) = tetraphenylphosphonium cation and NBu(4) = tetrabutylammonium cation), have been synthesized and their crystal structures determined by single-crystal X-ray diffraction. The structures of 1 and 2 consist of [ReX(4)(bpym)] molecules held together by van der Waals forces. In both complexes the Re(iv) central atom is surrounded by four halide anions and two nitrogen atoms of a bpym bidentate ligand in a distorted octahedral environment. The structures of 3 and 4 consist of [ReX(4)(bpym)](-) anions and PPh(4)(+) () or NBu(4)…

Organoplatinum(II) Complexes Self-Assemble and Recognize AT-Rich Duplex DNA Sequences

2021

The specific recognition of AT-rich DNA sequences opens up the door to promising diagnostic and/or therapeutic strategies against gene-related diseases. Here, we demonstrate that amphiphilic PtII complexes of the type [Pt(dmba)(N∧N)]NO3 (dmba = N,N-dimethylbenzylamine-κN, κC; N∧N = dpq (3), dppz (4), and dppn (5)) recognize AT-rich oligonucleotides over other types of DNA, RNA, and model proteins. The crystal structure of 4 shows the presence of significant π-stacking interactions and a distorted coordination sphere of the d8 PtII atom. Complex 5, containing the largest π-conjugated ligand, forms supramolecular assemblies at high concentrations under aqueous environment. However, its aggreg…

Molecular, Supramolecular Structures Combined with Hirshfeld and DFT Studies of Centrosymmetric M(II)-azido {M=Ni(II), Fe(II) or Zn(II)} Complexes of…

2021

The supramolecular structures of the three metal (II) azido complexes [Fe(4bzpy)4(N3)2]

Formation and distortion of iodidoantimonates(III): the first isolated [SbI6]3- octahedron

2017

The ability to intentionally construct, through different types of interactions, inorganic–organic hybrid materials with desired properties is the main goal of inorganic crystal engineering. The primary deformation, related to intrinsic interactions within inorganic substructure, and the secondary deformation, mainly caused by the hydrogen bond interactions, are both responsible for polyhedral distortions of halogenidoantimonates(III) with organic cations. The evolution of structural parameters, in particular the Sb—I secondary- and O/N/C—H...I hydrogen bonds, as a function of temperature assists in understanding the contribution of those two distortion factors to the irregularity of [SbI6]…

Estudio Hidrogeoquimico De Las Áreas Termales Del Complejo Volcánico Copahue-Caviahue

2016

Hydrogeochemical study on Thermal areas of the Copahue-Caviahue Volcanic Complex The hydrothermal system hosted in the Copahue- Caviahue Volcanic Complex consists of different geothermal areas around the Copahue volcano, whose last eruptive cycle started on December 22 of 2012. This work presents new data from the samplings of November 2012 and march 2013 in Las Maquinas, Las Maquinitas, villa de Copahue and Chancho-Có areas. These acid-sulfate and steam heated waters, presented changes in their SO4-2 concentrations, especially in Las Maquinas and Las Maquinitas areas. Meanwhile, SO4-2/Cl- ratios presented a strong decrease in the samples from November 2012, regarding the samples from 2013.…

ESTRATEGIAS Y ESTILOS DE AFRONTAMIENTO PARENTAL EN FAMILIAS CON NIÑOS CON TRASTORNO DE ESPECTRO AUTISTA (TEA) CON O SIN TRASTORNO POR DÉFICIT DE ATEN…

2015

La crianza de un hijo con Trastorno del Espectro Autista (TEA) ocasiona un fuerte impacto sobre la dinámica familiar. Cuando este trastorno se presenta con otro comórbido, como el Trastorno por Déficit de Atención con Hiperactividad (TDAH), las repercusiones sobre el bienestar psicológico de los padres pueden verse considerablemente aumentadas. Conocer qué estilos y estrategias de afrontamiento se emplean con mayor frecuencia podría contribuir a diseñar intervenciones con las familias, que pudieran repercutir positivamente en la manifestación de la sintomatología autista. El objetivo de este estudio consiste en profundizar en los estilos y estrategias de afrontamiento más frecuentes de esta…

"E non disputate con la Gente del Libro altro che nel modo migliore".

2017

Corruption and managing the project cycle : the role of corrupt practices in NGO funding in Pakistan

2013

This Master’s thesis research explores the role of corrupt practices in development projects implemented by local NGOs in Pakistan. The intention is not to expose particular cases of corruption, but to study corruption risks and vulnerabilities in different phases of the project cycle and financial management (budgeting, accounting, financial reporting and auditing). It also explores other program support functions, i.e. procurement and human resources, and their vulnerability to corruption. The contribution of this study to academic literature is increasing awareness of NGO corruption and its different forms in Pakistan from the project management point of view. This is a qualitative study…

Evidence for Photoinduced Hole Coupling in BaTiO3:Co

1995

A possible photoinduced correlation mechanism in BaTiO 3 : Co is described. The underlying microscopic process is a local hole photoinjection at a Co 3+ site close to a preexisting metastable hole, The Jahn-Teller field at the Co 2+ site transfers this pair of holes in the next cell along the rhombic direction [111] before normal polaronic or band conduction. The spatial extension of this correlation depends on a characteristic «delocalization» length. This unstable conductive state appears to be possibly frozen in a permanent way below T c