Metallheteroborane chemistry. Part 8.—NMR study of some arsena‐ and stibaboranes and of the rhodadiarsenaboranes [3,3‐(PPh₃)₂‐3‐(H)‐<i>closo</i>‐3,1,2‐RhAs₂B₉H₉] and [3‐(η⁵‐<i>C</i>₅Me₅)‐<i>closo</i>‐3,1,2‐RhAs₂B₉H₉]

Abstract

Abstract The cluster 11 B and 1 H NMR chemical shifts of the known arsenaborane species [7‐Me‐ nido ‐7‐AsB 10 H 12 ], [7‐Me‐ nido ‐7‐AsB 10 H 11 ] − , [ nido ‐7‐AsB 10 H 12 ] − , [ closo ‐1,2‐As 2 B 10 H 10 ] and [ nido ‐7,8‐As 2 B 9 H 10 ] − , of the known stibaborane species [ closo ‐1,2‐Sb 2 B 10 H 10 ] and [ closo ‐1,2‐CSbB 10 H 11 ], and of the previously unreported metalladiarsenaboranes [3,3‐(PPh 3 ) 2 ‐3‐(H)‐ closo ‐3,1,2‐RhAs 2 B 9 H 9 ] and [3‐(η 5 ‐C 5 Me 5 )‐ closo ‐3,1,2‐RhAs 2 B 9 H 9 ] were measured and assigned by [ 11 B– 11 B]‐COSY, [ 1 H– 1 H]‐COSY‐{ 11 B}, and 1 H–{ 11 B} NMR experiments. Similarities and trends in the cluster shielding patterns were examined in order to assess changes in supposed electronic structures.