Tris(pyrazolyl)methane and 1,8-naphthalimide-functionalized dialkynylgold(I) anionic complexes.

The reaction of tetrapropylammonium bis(acetylacetonato)gold(I) with alkyne derivatives of the tris(pyrazolyl)methane and 1,8-naphthalimide functional groups yielded two new compounds, both bridged by the linear C[triple-bond]C-Au-C[triple-bond]C spacer, namely tetrapropylammonium bis{3-[2,2,2-tris(1H-pyrazol-1-yl)ethoxy]prop-1-yn-1-yl}aurate(I), (C16H28N)[Au(C14H13N6O)2], and tetrapropylammonium {η(2)-μ-3-[2,4-dioxo-3-azatricyclo[7.3.1.0(5,13)]trideca-1(12),5,7,9(13),10-pentaen-3-yl]prop-1-yn-yl}bis{3-[2,4-dioxo-3-azatricyclo[7.3.1.0(5,13)]trideca-1(12),5,7,9(13),10-pentaen-3-yl]prop-1-yn-1-yl}digold(I) deuterochloroform disolvate, (C16H28N)[Au2(C15H8NO2)3]·2CDCl3. The alkyne-functionalized scorpionate ligand [Au{C[triple-bond]CCH2OCH2C(pz)3}2](-) features two potentially tridentate tris(pyrazolyl)methane donor groups oriented in a `trans' position relative to the C[triple-bond]C-Au-C[triple-bond]C spacer. The naphthalimide-containing compound comprises a σ-bonded NI-CH2-C[triple-bond]C-Au-C[triple-bond]C-CH2-NI unit (NI is the naphthalimide group) π-coordinated to an NI-CH2-C[triple-bond]C-Au neutral fragment. The crystal packing of this compound is supported by π-π stacking interactions of the NI unit, generating a three-dimensional network containing channels accommodating the tetrapropylammonium cations and deuterated chloroform solvent molecules.