Synthesis and crystal structure of alkaline-earth metal cryptates of a ligand derived from 2,6-diformyl-pyridine
2007
New alkaline-earth metal cryptates [ML](ClO4)2 · solvent (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 characterized by physical methods. The crystal structure of the calcium cryptate was determined. The central atom is nine coordinate with three pyridyl and six imino nitrogen atoms. The coordination polyhedron can be described as slightly distorted tricapped trigonal prism.
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