Syntheses, structures and properties of a series of photochromic hybrids based on Keggin tungstophosphates

✍ Scribed by Li-Zhi Zhang; Wen Gu; Zhili Dong; Xin Liu; Bing Li; Mei-Ling Liu

• Publisher: Elsevier Science
• Year: 2009
• Tongue: English
• Weight: 833 KB
• Volume: 182
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1016/j.jssc.2009.01.037

✦ Synopsis

Three inorganic-organic hybrids based on Keggin tungstophosphates and lanthanides, [Pr(NMP) 6 (PW 12 O 40 )] n (1), [Eu(NMP) 6 (PW 12 O 40 )] n (2), and [Er 2 (NMP) 12 (PW 12 O 40 )][PW 12 O 40 ]

(3) (NMP ¼ N-methyl-2-pyrrolidone), have been synthesized and characterized by elemental analysis, IR, UV-vis, and single-crystal X-ray diffraction. Compounds 1 and 2 exhibit 1D infinite zigzag chain structures, while compound 3 exhibits an ionic asymmetric structure due to lanthanide contraction. The three compounds are all photochromic. The magnetic susceptibility for 1 measured over the range 2-300 K shows that there is the dominant antiferromagnetic interaction in the compound. The results of luminescent properties show that compound 2 displays an interesting selectivity for Zn 2+ ions.