An expression is derived from first principles that indicates a 104 improvement in the detection limit for trace metal analyses by use of crystalline energy transfer instead of normal luminescence methods. These calculations were experimentally verified by examining a crystal
comprised of tris-(2,2'-bipyridine) zinc (II) dichloride [Zn(bipyr)3Cl2] as the host and tris-(2,2'-bipyridine) ruthenium (II) dichloride [Ru(bipyr)3Cl2] as the emitting guest. With this system subnanogram levels of ruthenium could be measured. To
verify the possibility of crystalline energy transfer quenching analysis a three component crystal was examined that had a fixed concentration of the ruthenium chelate and a varying amount of tris-(2,2'-bipyridine) iron (II) dichloride [Fe(bipyr)3Cl2] as the quenching
agent. With this system nanogram levels of iron could be measured.
Department of Chemistry, Purdue University, Lafayette, Indiana 47907
Publication date: September 1, 1971
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