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

• Published in: Acta crystallographica. Section C, Crystal structure communications Crystal structure communications, 2013-12, Vol.69 (12), p.1488-1493
• Main Authors: Liu, Yan-Fei, Zhao, Chao-Wei, Ma, Jian-Ping, Liu, Qi-Kui, Dong, Yu-Bin
• Format: Article
• Language: English
• Subjects: CHAINS; Chemistry; Coordination Complexes - chemistry; coordination polymers; Copper - chemistry; copper(I) complexes; crystal structure; Crystallography, X-Ray; fluorene-based ligands; Fluorenes - chemistry; Hydrogen Bonding; Ligands; Molecular Structure; Organic chemicals
• ISSN: 0108-2701; 1600-5759
• DOI: 10.1107/S0108270113030163

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), and 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 (I), resulting a two‐dimensional network in the ab plane, including a chiral helical chain along the b axis. Compounds (II) and (III) are related one‐dimensional polymers. In both, CuI atoms connect the symmetric ligands (L1 or L2) into a one‐dimensional chain. In (II), the {[CuICl2]−} unit, acting as a co‐anion, adheres to the one‐dimensional chain through a weak Cu...Cu interaction. However, in (III), the {[CuI2Cl4]2−} unit links two different chains into a one‐dimensional rope‐ladder‐type chain. In addition, there are C—H...Cl hydrogen bonds and π–π interactions in the extended structures of (II) and (III), the difference is that the chains in (II) are linked into a two‐dimensional network while the chains in (III) are stacked into a three‐dimensional framework.