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Syntheses of Alkaline Earth and Lanthanide Cryptates with Pyridine-Based Group
Author(s): 
Pages: 674-678
Year: Issue:  6
Journal: JOURNAL OF RARE EARTHS

Keyword:  alkaline earth metallanthanidecryptatesynthesiscrystal structurerare earths;
Abstract: New alkaline earth metal cryptates [ML](NO3)2·2H2O (M=Ca2+, Sr2+, Ba2+; L=1, 4, 12, 15, 18, 26, 31, 39, 42, 43, 44-undecaazapentacyclo-[13.13.13.16, 10.120, 24.133, 37]-tetratetraconta -4, 6, 8, 10(44), 11, 18, 20, 22, 24(43), 25, 31, 33, 35, 37(42), 38-pentadecaene) were synthesized by [2+3] template condensation of tris(2-aminoethyl) amine with 2, 6-diformylpyridine, and then by transmetallation reactions of the calcium cryptate [CaL](NO3)2·2H2O with corresponding lanthanide ions; three lanthanide cryptates [LnL](NO)3·3H2O (Ln=Eu, Gd, Tb) were synthesized and characterized by physical methods.The crystal structure of the terbium cryptate [TbL](NO)3·3H2O was studied by X-ray analysis.The central atom was coordinated by three pyridyl and six imino nitrogen atoms and exhibited a distorted tricapped trigonal prismatic coordination geometry.
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