I-127 MOSSBAUER-SPECTRA AND X-RAY CRYSTAL-STRUCTURES FOR HYPERVALENT IODINE(III) COMPLEX OF HEXAFLUOROCUMYL ALCOHOL AND RELATED 10-I-3 COMPOUNDS

The crystal structures of 1-chloro-3,3-bis(trifluoromethyl-1 lambda(3) ,2(1H)-benzoiodoxole (I(hfpp)Cl) and 1-chloro-1 lambda(3), 2-benzoiodo xole-3(1H)-one (I(ba)Cl) are determined, Although the T-shaped molecul ar structure for I(hfpp)Cl is quite similar to that for I(ba)Cl, the i ntermolecular interactions including the secondary bondings are signif icantly different; I(ba)Cl adopts an infinite chain structure with two longer I ... O' interactions, whereas I(hfpp)Cl has a dimeric structu re with one I ... O' secondary bonding. The I-127 Mossbauer spectrum f or I(hfpp)Cl is quite similar to those of hypervalent iodine(III) comp ounds having carboxylic and sulfonic ligands and chloride. This shows that the 5p electrons of the iodine(III) atom in I(hfpp)Cl are markedl y withdrawn by apical oxygen and chlorine atoms almost equally, sugges ting that the alcoholic oxygen atom of the ligand is quite electronega tive.