Luminescent Tris(3-ethyl-1,5-diaza-3-azonia-7-phosphatricyclo[3.3.1.1^3,7]decane-P)gold(I) Tetraiodide Trihydrate, [(EtTPA)₃Au]I₄.3H₂O

The title complex, [Au(C₈H₁₇N₃P)₃]I₄.3H₂O, has the complex cation lying with its Au and associated I atom on a crystallographic threefold axis. The AuP₃ moiety has distorted trigonal-planar geometry [the Au atom is 0.336 (3) Å from the P₃ plane], with Au—P 2.334 (3), Au...I 2.9129 (12) Å and P—Au—P 117.97 (3)°. The asymmetric unit also has one iodide ion and one water molecule in general positions, with O...I distances [3.516 (2) and 3.576 (2) Å] consistent with O—H...I hydrogen bonding.

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