Structural implications of the 115In nuclear quadrupole resonance spectrum of CH 3 InI 2

Abstract

Based on its vibrational spectrum, CH 3InI 2 has been proposed to contain linear In(CH 3) + 2 ions rather than being a bridged halogen dimer as is found for most other compounds of this type. The 115In nuclear quadrupole resonance spectrum observed here for CH 3InI 2 yields a coupling constant of 1270.6 MHz and an asymmetry parameter of 0.051 ± 0.006. The small asymmetry parameter is additional evidence of an axially symmetric environment for indium, such as In(CH 3) + 2, and by comparison to In 2I 6 strongly suggests that the dimeric structure is not present.