The BH2 and CH−2 radicals have been generated and trapped in rare gas matrices for ESR (electron spin resonance) investigation. Theoretical calculations were conducted on these radicals and the CH+2 cation for detailed comparison with the experimental results. The observed magnetic parameters (MHz) for 13 CH−2 in neon matrices at 4 K were: giso =2.0027(3); 13 C; ‖Aiso‖=59(1) and H; ‖Aiso‖=45(1). For 11 BH2 in argon at 4 K the results were: giso =2.0016(3); 11 B; Aiso=358(2) and H; ‖Aiso‖=38(1). The electronic structure information obtained for these small radicals from theoretical and experimental results is discussed and compared with other related molecules.
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