Abstract: STUDY ON THE CONDITIONS FOR STABILIZING TRIGONALPRISM COORDINATION COMPOUNDSLiu Guozheng Wu Junnan Liu Boli(Department of Chemistry,Beijing Normal University,Beijing 100875)ABSTRACTA new calculating method has been proposed for the elongation and twist of trigonalprism.The calculations show that the calculated and determined values of the bite for bidentate trigonalprism complexes are similar and that rigidity of the bite favors the stabilization of the trigonalprism configuration.The structural characteristics of the bidentate ligands and central atoms are further discussed based on the structural data of trigonalprism compounds.The discussion provides a guide for the preparation of new trigonalprism labelled compounds.Key words Trigonalprism Configuration Technetium Rhenium