Photoluminescent calcium azolium carboxylates with diversified calcium coordination geometry and thermal stability

Dalton Transactions : an International Journal of Inorganic Chemistry
Paladugu SureshGanesan Prabusankar

Abstract

Despite the popularity and versatility of transition-metal–azolium carboxylate coordination polymers, there are very few examples of group 2 complexes supported by azolium carboxylate ligands in the literature, and there are none featuring luminescent calcium azolium carboxylates. New ionic calcium coordination networks, {[Ca2(L(1))2(H2O)4](Br)4·6H2O}∞ (1), {[(L(3))2Ca(H2O)2]2(Br)2}∞ (3), {[(L(4))2Ca(H2O)2]2(Br)2}∞ (4), and {[(L(5))2Ca3(Na)(H2O)9(Cl)](Br)6·2H2O}∞ (5) along with binuclear {[Ca2(L(2))2(H2O)9](Br)4·4H2O} (2), and trinuclear {[(L(6))2Ca3(H2O)9](Br)6} (6) were isolated from the reaction between the corresponding azolium carboxylates and calcium carbonate in aqueous solution. 1–6 were characterized by FT-IR, NMR, TGA, UV-vis, fluorescence and single crystal X-ray diffraction techniques. Interestingly, the first tetra-cationic binuclear calcium 2 was isolated using L(2)H2Br2 and hexa-cationic trinuclear calcium 6 was isolated using L(6)H3Br3. The 3D coordination polymers 1 and 4 were derived with the help of L(1)H2Br2 and L(4)H2Br2, respectively, through Br···H hydrogen bonding. The 3D MOF 3 with rhomboidal channels was constructed using L(3)H2Br2, where the channel size is about 4.8 × 2.9 nm. 5 was isolated as a rare...Continue Reading

References

Apr 23, 2009·Chemical Society Reviews·Jeffrey R Long, Omar M Yaghi
Sep 14, 2011·Chemical Communications : Chem Comm·Guo-Qiang KongChuan-De Wu
Sep 24, 2011·Chemical Reviews·Jie-Peng ZhangXiao-Ming Chen
Nov 21, 2012·Journal of the American Chemical Society·Guo-Qiang KongChuan-De Wu
May 28, 2013·Dalton Transactions : an International Journal of Inorganic Chemistry·Xuan WangEn-Qing Gao
Jun 21, 2013·Dalton Transactions : an International Journal of Inorganic Chemistry·Paladugu SureshGanesan Prabusankar
Aug 31, 2013·Science·Hiroyasu FurukawaOmar M Yaghi

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