RESUMEN
The synthesis of a terbium-based 2D metal-organic framework (MOF), of formula [Tb(MeCOO)(PhCOO)2] (1), a crystalline material formed by neutral nanosheets held together by Van der Waals interactions, is presented. The material can be easily exfoliated by sonication and deposited onto different substrates. Uniform distributions of Tb-2D MOF flakes onto silicon were obtained by spin-coating. We report the luminescent and magnetic properties of the deposited flakes compared with those of the bulk. Complex 1 is luminescent in the visible and has a sizeable quantum yield of QY = 61% upon excitation at 280 nm. Photoluminescence measurements performed using a micro-Raman set up allowed us to characterize the luminescent spectra of individual flakes on silicon. Magnetization measurements of flakes-on-silicon with the applied magnetic field in-plane and out-of-plane display anisotropy. Ac susceptibility measurements show that 1 in bulk exhibits field-induced slow relaxation of the magnetization through two relaxation paths and the slowest one, with a relaxation time of τlf ≈ 0.5 s, is assigned to a direct process mechanism. The reported exfoliation of lanthanide 2D-MOFs onto substrates is an attractive approach for the development of multifunctional materials and devices for different applications.
RESUMEN
We report the microwave assisted synthesis of a bidimensional (2D) MOF of formula [Dy(MeCOO)(PhCOO)2 ]n (1) and its magnetically diluted analogue [La0.9 Dy0.1 (MeCOO)(PhCOO)2 ] (1 d). 1 is a 2D material with single-ion-magnet (SIM) behaviour and 1 d is a multifunctional, magnetic and luminescent 2D material. 1 can be exfoliated into stable nanosheets by sonication.
RESUMEN
Introducción: A pesar de los avances en la reproducción asistida sigue habiendo pacientes infértiles con problemas para lograr un niño sano en casa. De entre todas las causas de infertilidad, las alteraciones cromosómicas, y en particular las translocaciones afectan al 0,2% de la población humana. Objetivos: Valorar las repercusiones sobre la calidad seminal del hecho de ser portador de una translocación cromosómica y comparar con un grupo control de varones infértiles con cariotipo normal. Material y métodos: Estudio retrospectivo sobre una población de 973 varones con cariotipo realizado entre enero de 2008 y diciembre de 2016 en la Unidad de Reproducción Humana del CHUC. De ellos 19 varones fueron portadores de translocaciones y se tomó un grupo de 93 pacientes 46XY como grupo control. Resultados: Se encontraron diferencias significativas en: edad, diagnóstico del seminograma, volumen seminal y concentración de espermatozoides en fresco. Discusión: El diagnóstico de patología seminal como la Oligozoospermia o Azoospermia hace necesario indicar un cariotipo, realización de FISH en espermatozoides y en caso de alteración realización de un consejo genético y DGP
Introduction: Beside the advances in assisted reproduction, steel are infertile patients with problems to have a healthy baby at home. One of the causes of infertility is the chromosomal alterations, and in particular are the chromosomal translocations that affects at 0.2% of human population. Objectives: To value the repercussions on the seminal quality the fact of having a chromosomal translocation compared with a control group of infertile men with normal cariotype. Material and Methods: Retrospective study of a population of 973 males cariotype between January 2008 and December 2016 at the Unit of Human Reproduction of the CHUC. 19 of them had a chromosomal translocation and a group of 93 was taken as a control group 46XY. Results: Differences were founded on: age, semiformal diagnostic, seminal volume and sperm concentration in fresh. Discussion: The diagnosis of seminal pathology as Oligozoospermia or Azoospermia makes necessary to indicate a cariotype, a FISH of spermatozoa and if it is pathologic, a genetic counselling and PGD