Mixed-Metal d-f Phosphonate Frameworks - Photoluminescence and Magnetic Properties
authors Rocha, J; Paz, FAA; Shi, FN; Ananias, D; Silva, NJO; Carlos, LD; Trindade, T
nationality International
journal EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
author keywords Metal-organic frameworks; Lanthanides; Iron; Photoluminescence; Magnetic properties
keywords ORGANIC FRAMEWORK; COORDINATION POLYMERS; LANTHANIDE PHOSPHONATES; HYDROTHERMAL SYNTHESIS; CRYSTAL-STRUCTURES; HYBRID FRAMEWORK; ADSORPTION; N-(PHOSPHONOMETHYL)IMINODIACETATE; CHEMISTRY; HYDROGEN
abstract The synthesis and structural characterisation of a novel family of highly symmetric (rhombohedral crystal system) frameworks, incorporating d- and f-block elements formulated as [LnFe(III)Fe(6)(II)(Hpmida)(6)]center dot nH(2)O [Ln = Nd3+ (1), Gd3+ (2), Tb3+ (3), Er3+ (4)] is reported. This is the second example of a family of porous mixed d-f MOFs containing high-spin Fe2+ centres. These materials were prepared from an eutectic mixture (1:1 molar ratio, choline chloride/malonic acid) with a small amount of added water and isolated directly in large amounts as single crystalline phases. The structural details were revealed by single-crystal X-ray diffraction, variable-temperature powder X-ray diffraction, thermogravimetry, vibrational and Mossbauer spectroscopy and electron microscopy (SEM and EDS). Networks are assembled by unusual [Fe-2(Hpmida)(2)](2-) dimeric units, which connect to each other and to the lanthanide centres to form a 3D porous framework. The empty voids of this framework accommodate charge-balancing Fe3+ cations and uncoordinated water molecules, which are readily released without structural collapse at temperatures below 250 degrees C. The photoluminescence and magnetic properties of the compounds were studied at ambient and low temperature.
publisher WILEY-V C H VERLAG GMBH
issn 1434-1948
year published 2011
issue 13
beginning page 2035
ending page 2044
digital object identifier (doi) 10.1002/ejic.201001145
web of science category Chemistry, Inorganic & Nuclear
subject category Chemistry
unique article identifier WOS:000290232700003
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journal impact factor 2.529
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