Soft scorpionate coordination at alkali metals

Abstract

Reported here are the single-crystal X-ray structure analyses of bis-μ-methanol-κ4 O:O-bis{[hydrotris(3-phenyl-2-sulfanylidene-2,3-dihydro-1H-1,3-imidazol-1-yl)borato-κ3 H,S,S′](methanol-κO)sodium(I)}, [Na2(C27H22BN6S3)2(CH4O)4] (NaTmPh), bis-μ-methanol-κ4 O:O-bis{[hydrotris(3-isopropyl-2-sulfanylidene-2,3-dihydro-1H-1,3-imidazol-1-yl)borato-κ3 H,S,S′](methanol-κO)sodium(I)}–diethyl ether–methanol (1/0.3333/0.0833), [Na2(C18H28BN6S3)2(CH4O)4]·0.3333C4H10O·0.0833CH3OH (NaTmiPr), and a novel anhydrous form of sodium hydrotris(methylthioimidazolyl)borate, poly[[μ-hydrotris(3-methyl-2-sulfanylidene-2,3-dihydro-1H-1,3-imidazol-1-yl)borato]sodium(I)], [Na(C12H16BN6S3)] ([NaTmMe] n ). NaTmiPr and NaTmPh have similar dimeric molecular structures with κ3 H,S,S′-bonding, but they differ in that NaTmPh is crystallographically centrosymmetric (Z′ = 0.5) while NaTmiPr contains one crystallographically centrosymmetric dimer and one dimer positioned on a general position (Z′ = 1.5). [NaTmMe] n is a one-dimensional coordination polymer that extends along the a direction and which contains a hitherto unseen side-on η2-C=S-to-Na bond type. An overview of the structural preferences of alkali metal soft scorpionate complexes is presented. This analysis suggests that these thione-based ligands will continue to be a rich source of interesting alkali metal motifs worthy of isolation and characterization.