1,261 research outputs found
The first dinuclear zinc(II) dithiocarbarnate complex with butyl substituent groups
The crystal structure of the title compound, bis( -N,N-
dibutyldithiocarbamato- 2S:S0)bis[(N,N-dibutyldithiocarba\-
forcelb]mato- 2S,S0)zinc(II)], [Zn2(C9H18NS2)4], has
been determined at 180 K. The structure contains two
crystallographically unique Zn2+ metal centres, showing
almost identical slightly distorted tetrahedral coordination
environments, and forming a dinuclear complex with two
skew-bridging syn-N,N-dibutyldithiocarbamate ligands. Two
other dithiocarbamate ligands are connected to the Zn2+
centres in a syn,syn-chelate coordination mode
Aerosol-assisted metallo-organic chemical vapour deposition of Bi2Se3 films using single-molecule precursors: the crystal structure of bismuth(m) dibutyldiselenocarbamate
The complexes [Bi{Se2CN(C2H5)2}3], [Bi{Se2CN(C4H9)2}3], [Bi{Se2CN(CH3)(C4H9)}3] and
[Bi{Se2CN(CH3)(C6H13)}3] have been synthesized and characterized structurally using IR, 1H and 13C NMR. In
addition, the crystal structure of [Bi{Se2CN(C4H9)2}3] was determined by single-crystal X-ray diffraction,
showing the bismuth centre coordinated to three dialkyldiselenocarbamate ligands through the selenium donor
atoms. The Bi(III) compounds were used as precursors for the deposition of Bi2Se3 films on glass substrates
through aerosol-assisted metallo-organic chemical vapour deposition (AA-MOCVD)
Synthesis of CdS and CdSe nanocrystallites using a novel single-molecule precursors approach
The synthesis of CdS and CdSe nanocrystallites using the thermolysis of several dithioor
diselenocarbamato complexes of cadmium in trioctylphosphine oxide (TOPO) is reported.
The nanodispersed materials obtained show quantum size effects in their optical spectra
and exhibit near band-edge luminescence. The influence of experimental parameters on
the properties of the nanocrystallites is discussed. HRTEM images of these materials show
well-defined, crystalline nanosized particles. Standard size fractionation procedures can
be performed in order to narrow the size dispersion of the samples. The TOPO-capped CdS
and CdSe nanocrystallites and simple organic bridging ligands, such as 2,2¢-bipyrimidine,
are used as the starting materials for the preparation of novel nanocomposites. The optical
properties shown by these new nanocomposites are compared with those of the starting
nanodispersed materials
A novel supramolecular organic-inorganic adduct containing alpha-Keggin-type [PW12O40](3-) anions and benzo-15-crown-5 molecules
The structure of the title compound, tris(hydroxonium) 12-
phosphato-tetracosa- 2-oxo-dodecaoxododecatungsten hexakis(
benzo-15-crown-5)±methanol±water (1/1/1), (H3O)3-
[PW12O40] 6C14H20O5 CH3OH H2O (where C14H20O5 is
benzo-15-crown-5), has been determined at 180 K.
[PW12O40]3ÿ
anions are typical of -Keggin structures, and
the [H3O (C14H20O5)2]+ sandwich-type moieties contain a
large number of short O O close contacts, suggesting strong
hydrogen bonding within them
La tumba hipogea de Bolores (Torres Vedras): una aproximación interdisciplinar a la comprensión del paisaje social del NeolÃtico Final/Edad del Cobre de la PenÃnsula Ibérica
To better understand the sociopolitical landscape of the Portuguese Estremadura during the Late Neolithic/Copper Age, interdisciplinary excavations were conducted at Bolores (Torres Vedras), in the Sizandro River Valley. Following a test season in 1986, a University of Iowa team conducted four campaigns between 2007 and 2012. Bolores is a rock-cut tomb used primarily between 2800-2600 cal BC for the burial of adults, adolescents, and children (MNI=36). The architectural, material cultural, and bioarchaeological evidence suggests that Bolores housed the remains of a distinctive group of local individuals who marked their difference from other burial populations in the Sizandro and Estremadura through material culture and tomb architecture. Social differences were denoted spatially and through offerings of material goods. No social stratification is evident, however, that would suggest a state-level society: there are no wealthy child burials and no significant health or dietary disparities within this population or between it and others in the region.Para comprender mejor el paisaje sociopolÃtico de la Extremadura portuguesa durante el NeolÃtico Final/Edad del Cobre se han llevado a cabo excavaciones interdisciplinares en Bolores (Torres Vedras), en el valle del rÃo Sizandro. Tras una campaña de prueba en 1986, un equipo de la Universidad de Iowa realizó cuatro campañas entre 2007 y 2012. Bolores es una tumba hipogea que fue utilizada principalmente entre 2800 y 2600 cal BCE como enterramiento colectivo para adultos, adolescentes y niños (NMI=36). Los datos arquitectónicos, bioarqueológicos y de cultura material analizados hasta la fecha sugieren que Bolores albergó los restos de un grupo social distintivo compuesto de individuos locales que marcaban sus diferencias con otras poblaciones funerarias del Sizandro y Extremadura portuguesa mediante la cultura material y la arquitectura funeraria. Las diferencias sociales en la población de Bolores fueron señaladas espacialmente y marcadas mediante las ofrendas de bienes materiales. Sin embargo, no se aprecia una estratificación social significativa que sugiera una sociedad de nivel estatal: no hay enterramientos infantiles ricos, ni disparidades en la salud o dieta de esta población funeraria o entre esta población y otras en la región de Torres Vedras
Recommendations for cardiovascular magnetic resonance in adults with congenital heart disease from the respective working groups of the European Society of Cardiology
This paper aims to provide information and explanations regarding the clinically relevant options, strengths, and limitations of cardiovascular magnetic resonance (CMR) in relation to adults with congenital heart disease (CHD). Cardiovascular magnetic resonance can provide assessments of anatomical connections, biventricular function, myocardial viability, measurements of flow, angiography, and more, without ionizing radiation. It should be regarded as a necessary facility in a centre specializing in the care of adults with CHD. Also, those using CMR to investigate acquired heart disease should be able to recognize and evaluate previously unsuspected CHD such as septal defects, anomalously connected pulmonary veins, or double-chambered right ventricle. To realize its full potential and to avoid pitfalls, however, CMR of CHD requires training and experience. Appropriate pathophysiological understanding is needed to evaluate cardiovascular function after surgery for tetralogy of Fallot, transposition of the great arteries, and after Fontan operations. For these and other complex CHD, CMR should be undertaken by specialists committed to long-term collaboration with the clinicians and surgeons managing the patients. We provide a table of CMR acquisition protocols in relation to CHD categories as a guide towards appropriate use of this uniquely versatile imaging modalit
Assessment of Chronic Illness-Related Cognitive Fusion: Preliminary Development and Validation of a New Scale with an IBD Sample
Although research recognizes the advantages of creating specific content measures, no specific measure of chronic illness-related cognitive fusion had been developed to date. The current study presents the development and validation of the Cognitive Fusion Questionnaire-Chronic Illness (CFQ-CI) in a sample of inflammatory bowel disease (IBD) patients and the analysis of the role of this construct in the psychological health of those patients. Results indicated that the 7-item CFQ-CI was a unidimensional measure of cognitive fusion in patients with chronic illnesses, and that scores had adequate/good internal consistency and construct, convergent, and discriminant validity. This study also showed that chronic illness-related cognitive fusion as assessed by the CFQ-CI acted as a mediator in the association between both IBD-related symptoms and shame with quality of life. The development of the CFQ-CI may thus contribute to a better understanding of the mechanisms influencing functional outcomes in chronic illness
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