Very high titanium content mesoporous silicas

Titanium content in mesoporous titanosilicate catalysts has been modulated up to a minimum Si/Ti value of 1.9 by using complexing agents able to coordinate both Si and Ti atoms and harmonize the reactivity of the resulting precursors avoiding subsequent phase segregation and leading to chemically very homogeneous materials.El Haskouri, Jamal, [email protected] ; Beltran Porter, Aurelio, [email protected] ; Beltran Porter, Daniel, [email protected] ; Amoros del Toro, Pedro Jose, [email protected]

Large monolithic silica-based macrocellular foams with trimodal pore system

Silica-based materials with hierarchical pore systems at three different length scales (small mesopores–large mesopores–macropores) have been prepared through a nanotectonic approach by using mesoporous nanoparticles as building blocks; the resulting materials present a highly accessible foam-like architecture and can be prepared as large monoliths.Huerta Morillo, Lenin Jose, [email protected] ; Latorre Saborit, Julio, [email protected] ; Beltran Porter, Aurelio, [email protected] ; Beltran Porter, Daniel, [email protected] ; Amoros del Toro, Pedro Jose, [email protected]

Supramolecular self-assembling in mesostructured materials through charge tuning in the inorganic phase

Supramolecular self-assembling of organic CTA+ micelles and inorganic [VO(H2O)PO4]n^q-2 2D-anions for the isolation of hexagonal mesostructured materials can be reached by charge tuning in the inorganic phase through the adjustment of the vanadium mean oxidation state.El Haskouri, Jamal, [email protected] ; Cabrera Medina, Saul, [email protected] ; Beltran Porter, Aurelio, [email protected] ; Alamo Serrano, Jaime, [email protected] ; Beltran Porter, Daniel, [email protected] ; Amoros del Toro, Pedro Jose, [email protected]

Tuning the pore size from micro- to meso-porous in thermally stable aluminophosphates

Thermally stable porous aluminophosphates (ICMUV-3) with P/Al molar ratios in the range 0.15 <= P/Al <= 0.75 and showing continuously adjustable pore sizes from 13 to 37 Å have been prepared through a surfactant-assisted procedure without changing the surfactant length and/or addition of organic expansors.Cabrera Medina, Saul, [email protected] ; El Haskouri, Jamal, [email protected] ; Beltran Porter, Aurelio, [email protected] ; Beltran Porter, Daniel, [email protected] ; Amoros del Toro, Pedro Jose, [email protected]

Crystal structure and magnetism of Co(HPO3)⋅H2O: A novel layered compound of Co(II)

Under the terms of the Creative Commons Attribution (CC BY) license to their work.-- et al.The crystal structure and magnetic properties of Co(HPO3)⋅H2O have been determined. The solid crystallizes in space group P c a21, a=8.984(2) Å, b=7.918(2) Å, c=10.139(8) Å, V=721.2 Å3. Z=4 d calc =2.89 g/cm3. The structure consists of layers only connected by hydrogen bonds. These layers can be viewed as formed by zigzag chains of edge‐sharing Co(II)O6 octahedra interconnected by a three atom bridge (O‐P‐O) and a single oxygen bridge. ac magnetic susceptibility measurements show a sharp peak at T c =(10.8±0.1) K, and are consistent with a transition from one‐ to two‐dimensional magnetic order, in agreement with the structure. An analysis of the χT/C vs ε=(1−T c /T) data in the critical region, for T>T c , using a double‐logarithmic plot, yields a critical exponent γ=1.75 for 0.01<ε<0.1, which correspond to a two‐dimensional Ising model.The financial support of the Spanish Commission Interministerial de Cienda yTecnologia (C.I.C.Y.T. No. BP086-0187) is acknowledged. M. D. M., P. A. and F. S. thank the Spanish Ministerio de Educacion y Ciencia for predoctoral fellowships and P. G. R. for a postdoctoral fellowship.Peer Reviewe

Towards the Loewenstein limit (Si/Al = 1) in thermally stable mesoporous aluminosilicates

The use of complexing agents to generate polynuclear precursor species containing both Al and Si allows the synthesis of thermally stable mesoporous aluminosilicates including solely tetrahedrally coordinated aluminium, in which the Si/Al ratio can be modulated down to a minimum Si/Al value of 1.06(4).Cabrera Medina, Saul, [email protected] ; El Haskouri, Jamal, [email protected] ; Latorre Saborit, Julio, [email protected] ; Beltran Porter, Aurelio, [email protected] ; Beltran Porter, Daniel, [email protected] ; Amoros del Toro, Pedro Jose, [email protected]

The ferrimagnetic compounds CoM[M'(EDTA)]2.4H2O (M,M'=Co,Ni): Magnetic characterization of CoCo[Ni(EDTA)]2.4H2O

Under the terms of the Creative Commons Attribution (CC BY) license to their work.We report on the magnetic properties of the ordered bimetallic compound CoCo(NiEDTA)2⋅4H2O (abbreviated as [CoCoNi]). The structure consists of ordered bimetallic layers formed by alternating octahedral sites of Co and Ni(II); tetrahedral Co sites connect different Co‐Ni layers. We discuss the low‐dimensional ferrimagnetic behavior of this compound in terms of a model that assumes three spin sublattices exchange coupled by an Ising interaction.This work was supported by the Comision Interministerial en Ciencia y Tecnologia (Grant No. PB 85-OI06-C02-02), the Iustitucio Valenciana d'Estudis i Investigació, and the National Science Foundation (Grant No. DMR-8515224). F. S. andP. G. R. thank the Spanish Ministerio de Educacion y Ciencia for a predoctoral and postdoctoral fellowship, respectively.Peer Reviewe

Silica-based powders and monoliths with bimodal pore systems

Porous pure and doped silicas with pore sizes at two length scales (meso/macroporous) have been prepared and shaped both as powders and monoliths through a one-pot surfactant assisted procedure by using a simple template agent and starting from atrane complexes as inorganic precursors.El Haskouri, Jamal, [email protected] ; Latorre Saborit, Julio, [email protected] ; Beltran Porter, Aurelio, [email protected] ; Beltran Porter, Daniel, [email protected] ; Amoros del Toro, Pedro Jose, [email protected]

A new method for fluoride determination by using fluorophores and dyes anchored onto MCM-41

A new colourimetric and fluorimetric method for fluoride determination in aqueous samples based on the specific reaction between fluoride and silica has been developed and applied on real samples.Descalzo Lopez, Ana Belen, [email protected] ; El Haskouri, Jamal, [email protected] ; Beltran Porter, Daniel, [email protected] ; Amoros del Toro, Pedro Jose, [email protected]

A new intermediate intercalate in superconducting sodium-doped hafnium nitride chloride

Anew phase has been observed during the sodiumintercalation of hafnium nitride chloride as intermediate between the host β-HfNCl and the already reported Na 0.29 HfNCl with Tc of 24 K; the new intermediate shows interlayer spacings ranging from 9.48 to 9.67 A°, corresponds to a second stage intercalate of HfNCl and is superconducting with a critical temperature of 20 K.Beltran Porter, Daniel, [email protected]