THE ANOMALOUS HIGH REACTIVITY OF CA-8 IN THE GAS-PHASE - [CAS3](+) AND [CAS11](+)( WITH S)

The ion Ca+(g) reacts more rapidly than any other M(+)(g) with S-8(g), first forming [CaS3](+), which undergoes reversible addition of S-8 t o [CaS11](+), with slower formation of a second more stable isomer of [CaS11](+) believed from density functional calculations to have the s tructure (eta(2)-S-3)Ca(eta(4) 1,3,5,7-Cyclo-S-8).