1D and 2D supramolecular structures of silver carborane dicyclohexylphosphine complexes constructed by C–H⋯H–B dihydrogen bonding interactions

Five new carborane dicyclohexylphosphine complexes, [Ag2(μ-I)2{1,2-(P Cy2)2-1,2-C2B10H10}2] (1), [Ag2(SCN)2{1,2-(PCy2)2-1,2-C2B10H10}2]n·CH2Cl2 (2), [Ag(ClO4){1,2-(PCy2)2-1,2-C2B10H10}]·CH2Cl2 (3), [Ag2(μ-NO3)2{1,2-(PCy2)2-1,2-C2B10H10}2]·CH2Cl2 (4) and [Ag(SC6H4COOH){1,2-(PCy2)2-1,2-C2B10H10}2]·CH2Cl2 (5), have been synthesized by the reactions of 1,2-bis(dicyclohexylphosphino)-1,2-dicarba-closo-dodecaborane with AgX (X = I, SCN, ClO4, NO3 and SC6H4COOH) in CH2Cl2. The structures of the five complexes were characterized by elemental analysis, FT-IR, 1H, 13C, 11B and 31P NMR spectroscopy. X-ray structure analysis revealed that the structures of the complexes can be classified into three types. Complexes 1 and 4 are di-μ-X-bridged structures and complexes 3 and 5 are mononuclear structures, while complex 2 is a chain-like polymer. Complexes 1 and 2 form 2D supramolecular networks and complexes 3, 4 and 5 form 1D chains via C–H⋯H–B dihydrogen bonding interactions.

Graphical abstractFive new silver(I) complexes, [Ag2(μ-I)2{1,2-(PCycl2)2-1,2-C2B10H10}2] (1), [Ag2(SCN)2{1,2-(PCycl2)2-1,2-C2B10H10}2]n·CH2Cl2 (2), [Ag(ClO4){1,2-(PCycl2)2-1,2-C2B10H10}]·CH2Cl2 (3), [Ag2(μ-NO3)2{1,2-(PCycl2)2-1,2-C2B10H10}2]·CH2Cl2 (4) and [Ag(S C6H4COOH){1,2-(PCycl2)2-1,2-C2B10H10}2]·CH2Cl2 (5), have been synthesized and characterized by elemental analysis, FT-IR, 1H, 13C, 11B and 31P NMR spectroscopy.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► The C–H···H–B contacts were found in the five complexes. ► The C–H⋯H–B dihydrogen bonded system was investigated. ► The 1D and 2D supramolecular structures were discussed.