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Open‐Framework Polar Compounds: Synthesis and Characterization ofRare‐Earth Polyoxometalates (C 6 NO 2 H 5 ) 2 [Ln(H 2 O) 5 (CrMo 6 H 6 O 24 )]·0.5H 2 O (Ln = Ce and La)
Author(s) -
An Haiyan,
Xiao Dongrong,
Wang Enbo,
Li Yangguang,
Wang Xinlong,
Xu Lin
Publication year - 2005
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.200400696
Subject(s) - chemistry , crystallography , raman spectroscopy , pyridine , molecule , antiferromagnetism , lanthanide , magnetic susceptibility , infrared spectroscopy , polar , rare earth , chemical polarity , hydrothermal synthesis , crystal structure , stereochemistry , inorganic chemistry , hydrothermal circulation , medicinal chemistry , mineralogy , ion , organic chemistry , physics , astronomy , seismology , geology , optics , condensed matter physics
Two unprecedented open‐framework polar compounds (C 6 NO 2 H 5 ) 2 [Ln(H 2 O) 5 (CrMo 6 H 6 O 24 )] · 0.5H 2 O [Ln = Ce ( 1 ), La ( 2 ); C 6 NO 2 H 5 = pyridine‐3‐carboxylic acid], constructed from Anderson‐type polyoxo anions and rare‐earth cations, have been synthesized for the first time and characterized by elemental analysis, IR and Raman spectroscopy, TG analysis, and single‐crystal X‐ray diffraction. Both compounds crystallize in the polar space group Pmn 2 1 and are made up of [CrMo 6 H 6 O 24 ] 3– polyoxo anions linked by rare‐earth cations to form a fascinating 3D open framework with “guest” pyridine‐3‐carboxylic acid molecules and free water molecules residing in the channels. To the best of our knowledge, this represents the first example of an open‐framework polar compound constructed from rare‐earth polyoxometalates. The magnetic properties of compound 1 have been studied by measuring its magnetic susceptibility in the temperature range 2.0–300.0 K, indicating the existence of antiferromagnetic interactions. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005)