In:
European Journal of Inorganic Chemistry, Wiley, Vol. 2016, No. 34 ( 2016-12), p. 5356-5365
Abstract:
A family of lanthanide‐based inorganic–organic hybrids, [Ce 4 (PDA) 4 (H 2 O) 9 (SiW 12 O 40 )] · 6H 2 O ( 1 , PDA = 1,10‐phenanthroline‐2,9‐dicarboxylic acid), [Nd 5 (PDA) 5 (H 2 O) 13 (OH)(SiW 12 O 40 )] · 8H 2 O ( 2 ), [Sm 3 (PDA) 2 (H 2 O) 13 (OH)(SiW 12 O 40 )] · 16.5H 2 O ( 3 ), and [Dy 4 (PDA) 4 (H 2 O) 11 (SiW 12 O 40 )] · 7H 2 O ( 4 ), has been hydrothermally synthesized with the [SiW 12 O 40 ] 4– Keggin‐type anion as a building block. Characterization by IR spectroscopy, elemental analysis, thermogravimetric analysis (TGA), and single‐crystal X‐ray diffraction revealed that 1 – 4 are all coordination polymers with different structural features owing to the lanthanide‐contraction effect. Compound 1 is composed of cationic layers interconnected by Keggin anions in three dimensions. Compounds 2 and 3 are 1D rectangular tubelike and 1D ladderlike coordination polymers, respectively. The Keggin anion appears to play a different role in each of these hybrid structures, as its coordination mode varies between mono‐, bi‐, and tetradentate in 3 , 1 , and 2 , respectively. In 4 , the Keggin anions only reside in the interspace between two adjacent 2D cationic layers as discrete counterions. Magnetic measurements indicate that 4 exhibits frequency‐dependent alternating‐current (ac) magnetic susceptibilities indicative of slow relaxation of the magnetization.
Type of Medium:
Online Resource
ISSN:
1434-1948
,
1099-0682
DOI:
10.1002/ejic.v2016.34
DOI:
10.1002/ejic.201600936
Language:
English
Publisher:
Wiley
Publication Date:
2016
detail.hit.zdb_id:
1475009-0