The coordination chemistry of two symmetric fluorene-based organic ligands with cuprous chloride.

摘要: Two novel symmetric fluorene-based ligands, namely, 2,7-bis­(1H-imidazol-1-yl)-9,9-dimethyl-9H-fluorene [L1 or (I), C21H18N4] and 2,7-bis­(1H-imidazol-1-yl)-9,9-dipropyl-9H-fluorene (L2), have been used to construct the coordination polymers catena-poly[[di­chlorido­dicopper(I)(Cu—Cu)]-μ-2,7-bis­(1H-imid­azol-1-yl)-9,9-dimethyl-9H-fluorene], [Cu2Cl2(C21H18N4)]n, (II), catena-poly[[tetra-μ2-chlorido-tetra­copper(I)]-bis­[μ-2,7-bis­(1H-imidazol-1-yl)-9,9-dipropyl-9H-fluorene]], [Cu4Cl4(C25H26N4)2]n, (III). There are three types of C—H⋯N hydrogen bonds in resulting a two-dimensional network ab plane, including chiral helical chain along b axis. Compounds (II) (III) related one-dimensional polymers. In both, CuI atoms connect ligands (L1 L2) into chain. {[CuICl2]−} unit, acting as co-anion, adheres through weak Cu⋯Cu inter­action. However, (III), {[CuI2Cl4]2−} unit links two different chains rope-ladder-type addition, there C—H⋯Cl π–π inter­actions extended structures difference is that linked while stacked three-dimensional framework.