Validity of the Maternal Antenatal Attachment Scale-Spanish Version for Mexican Pregnant Women / Validez de la Escala de Apego Prenatal Materno: versión en español para mujeres mexicanas embarazadas

During pregnancy, parents experiment emotions, thoughts, and behaviors related to their unborn child as precursors of attachment in the caretaker-infant dyad. The Maternal Antenatal Attachment Scale (MAAS) is an instrument that has shown adequate psychometric properties to evaluate this construct in developed countries. The aim of this study was to assess the reliability and concurrent validity of the Maternal Antenatal Attachment Scale-Spanish version for Mexican women (MAAS-Spanish version). A sample of 142 women in their third trimester of pregnancy who received care in a tertiary hospital was selected. The full scale of the MAAS-Spanish version obtained a Cronbach alpha of .79. A significant negative correlation was found between the global MAAS-Spanish version score (r = -.23, p ≤ .01) and the Postpartum Depression Predictors Inventory-Revised and depressive symptoms (r = -.36 , p ≤ .01). The translated and adapted scale has adequate internal consistency and concurrent validity to measure this construct in this population. ()AU)

Durante el embarazo, los padres experimentan emociones, pensamientos e ideas sobre su nonato relevantes en el estudio de precursores del apego en la díada cuidador-infante. La Escala de Apego Prenatal Materno (MAAS) es un instrumento que ha mostrado adecuadas propiedades psicométricas para evaluar este constructo en países desarrollados. El propósito de este estudio fue evaluar la confiabilidad y validez concurrente de dicha escala—versión en español para mujeres mexicanas (MAAS—versión en español). Se seleccionó a una muestra de 142 mujeres en tercer trimestre gestacional, que recibían atención en un hospital de tercer nivel. La escala total obtuvo un alfa de Cronbach de .79. Se evidenció una correlación negativa significativa de la puntuación global de la MAAS de r = -.23, (p ≤ .01) con la PDPI-R y de r = -.36, (p ≤ .01) con la sintomatología depresiva (EPDS). La escala traducida cuenta con una consistencia interna y validez concurrente adecuadas para medir este constructo en esta población. (AU)

Extended Alkenyl and Alkynyl Benzotriazoles with Enhanced Two-Photon Absorption Properties as a Promising Alternative to Benzothiadiazoles.

A series of donor-π-acceptor-π-donor (D-π-A-π-D) benzoazole dyes with 2H-benzo[d][1,2,3]triazole or BTD cores have been prepared and their photophysical properties characterized. The properties of these compounds display remarkable differences, mainly as a result of the electron-donor substituent. Dyes with the best properties have visible-light absorption over λ=400 nm, large Stokes shifts in the range of about 3500-6400 cm-1 , and good fluorescence emission with quantum yields of up to 0.78. The two-photon absorption properties were also studied to establish the relationship between structure and properties in the different compounds synthesized. These results provided cross sections of up to 1500 GM, with a predominance of S2 ←S0 transitions and a high charge-transfer character. Time-dependent DFT calculations supported the experimental results.

Cycloaddition of Nitrile Oxides to Graphene: a Theoretical and Experimental Approach.

Density functional theory (DFT) studies of the interaction between graphene sheets and nitrile oxides have proved the feasibility of the reaction through 1,3-dipolar cycloaddition. The viability of the approach has been also confirmed experimentally through the cycloaddition of few-layer exfoliated graphene and nitrile oxides containing functional organic groups with different electronic nature. The cycloaddition reaction has been successfully achieved in one-pot from the corresponding oximes under microwave (MW) irradiation. The successful formation of the isoxazoline ring has been confirmed by Raman spectroscopy, Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA) and X-ray photoelectron spectroscopy (XPS).

D-A-D 2H-benzo[d][1,2,3]triazole derivatives as p-type semiconductors in organic field-effect transistors.

A series of Donor-π-Acceptor-π-Donor compounds based on a 2H-benzo[d][1,2,3]triazole core branched with different alkynyl donor groups has been characterized and tested in organic field-effect transistors (OFETs). The electronic and molecular structures were elucidated through optical and vibrational spectroscopy in conjunction with DFT calculations. The results indicate that the planarity of the structure and the good intramolecular charge transfer from the electron-donating to the electron-withdrawing fragments play a critical role in the application of the compounds as semiconductors in OFET devices. The compounds were tested in a top-contact/bottom-gate thin film transistor architecture, and they behave as p-type semiconductors.

Modulation of the exfoliated graphene work function through cycloaddition of nitrile imines.

After the feasibility of the 1,3-dipolar cycloaddition reaction between nitrile imines and exfoliated graphene by density functional theory calculations was proved, very few-layer graphene was effectively functionalized using this procedure. Hydrazones with different electronic properties were used as precursors for the 1,3-dipoles, and microwave irradiation as an energy source enabled the reaction to be performed in a few minutes. The anchoring of organic addends on the graphene surface was confirmed by Raman spectroscopy, X-ray photoelectron spectroscopy (XPS) and thermogravimetric analysis. Ultraviolet photoelectron spectroscopy (UPS) was used to measure the work function and band gap of these new hybrids. Our results demonstrate that it is possible to modulate these important electronic valence band parameters by tailoring the electron richness of the organic addends and/or the degree of functionalization.

Optical waveguides from 4-aryl-4H-1,2,4-triazole-based supramolecular structures.

Ribbon-like supramolecular structures prepared by the organized aggregation of 4-aryl-4H-1,2,4-triazoles act as optical waveguides that propagate photoluminescence.

Influence of polarity on the scalability and reproducibility of solvent-free microwave-assisted reactions.

Organic reactions performed in the absence of solvent in domestic ovens without appropriate temperature control are generally considered as not reproducible, particularly when different instruments are used. For this reason, reproducibility has historically been one of the major issues associated with Microwave-Assisted Organic Synthesis (MAOS) especially when domestic ovens are involved. The lack of reproducibility limits the general applicability and the scale up of these reactions. In this work several solvent-free reactions previously carried out in domestic ovens have been translated into a single-mode microwave reactor and then scaled up in a multimode oven. The results show that most of these reactions, although not considered as reproducible, can be easily updated and applied in microwave reactors using temperature-controlled conditions. Furthermore, computational calculations can assist to explain and/or predict whether a reaction will be reproducible or not.