Synthesis, crystal structures and Hirshfeld analyses of phosphonothioamidates (EtO)2P(=O)C(=S)N(H)R (R = Cy, Bz) and their coordination on CuI and HgX2 (X = Br, I)

Abstract

The phosphonothioamidates (EtO)2P(=O)C(=S)N(H)R (L1 R = Cy; L2 R = Bz) have been prepared by nucleophilic addition of K[(EtO)2P(=O)] to R–N = C=S and crystallographically analyzed. Both compounds are associated pairwise through strong intermolecular N–H···O bonding giving rise to 10-membered supramolecular macrocycles. This intermolecular bonding has also been studied by Hirshfeld analysis of L1 and L2. Complexation of L on CuI in MeCN solution affords the dinuclear rhomboid-shaped thione complexes [{Cu(μ2-I)2Cu}(η1-L)2] (1a,b). Crystallographic characterization of 1a reveals that L1 is ligated exclusively via the thione function to the trigonal Cu(I) centers, which are interconnected through a short Cu–Cu bond of 2.6207(4) Å. In the solid state, individual dimeric complexes are associated through intermolecular N–H···O bonding generating a supramolecular 1D ribbon. The dinuclear complexes [{XHg(μ2-X)2HgX}(η1-L)2] (2a X = Br, L = Cy; 2b X = Br, L = Bz; 2c X = I, L = Bz) were formed by stoichiometric addition of L to HgX2. The molecular structures of 2b and 2c have been elucidated by X-ray diffraction studies, which show that individual complexes are connected through intermolecular N–H···O bonding generating a supramolecular 1D ribbon. Treatment of L1 with two equivalents of HgBr2 produces the tetranuclear compound [Hg4Br8(κ1-L1)2] 3, whose unusual bromide-bridged architecture has been elucidated by X-ray crystallography.