7-Azaindol-7-ylborate: A Novel Bidentate N^BH₃ Chelating Ligand

7-Azaindole (H-azain) reacts with sodium borohydride (NaBH4) to yield the sodium salt of the novel 7-azaindol-7-ylborate anion (7-azain-7)BH3−, two rhodium derivatives of which reveal distinct coordination modes  [Rh{κ2N,H-H3B(7-azain-7)}(CO)(PPh3)2] and [Rh{κ3N,H,H′-H3B(7-azain-7)}(PPh3)2]thereby demonstrating how the variable denticity of the ligand may accommodate the varying electronic requirements of the metal center.7-氮杂吲哚（7-Azaindole，简称H-azain）与硼氢化钠（sodium borohydride，NaBH₄）反应，生成新型7-氮杂吲哚-7-基硼酸根阴离子（7-azain-7）BH₃⁻的钠盐。该阴离子的两种铑衍生物展现出截然不同的配位模式——分别为[Rh{κ²N,H-H₃B(7-azain-7)}(CO)(PPh₃)₂]与[Rh{κ³N,H,H′-H₃B(7-azain-7)}(PPh₃)₂]，由此证明该配体的可变齿合度可适配金属中心不同的电子需求。