Addition of BH 3 to 1,3,5-triaza-7-phosphaadamantane (PTA) leads to the formation of the first coordination complex of PTA in which a nitrogen and not the phosphorus of PTA is involved in the bonding. Multinuclear NMR spectroscopy, Xray crystallography, and computational chemistry are utilized in the characterization of the products. Crystal structures of PTA-BH 3 (1) and O=PTA-BH 3 (2) adducts are described. In addition a coordination polymer, [CpRu(PTA) 2 Cl(Ph 3 B 3 O 3 )] n