Heterotapes: A Persistent,Dual‐Synthon Hydrogen‐Bonding Motif |
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| Authors: | David R Turner Dr Sze Nee Pek Stuart R Batten Dr |
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| Institution: | School of Chemistry, Monash University, Clayton, Vic 3800, Australia, Fax: (+61)?03‐9905 4597 |
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| Abstract: | The small dinitrile anion carbamoyldicyanomethanide, C(CN)2‐(CONH2)]? (cdm), reproducibly forms a hydrogen‐bonded tape containing two different supramolecular synthons: a “heterotape”. The tape incorporates both an amide dimer and a nitrile‐containing ring. The robustness of the motif is confirmed by its persistence from an isolated tape in a separated ion‐pair structure, K(15c5)2](cdm)? H2O, to its incorporation into coordination complexes of octahedral metals, thus facilitating the formation of 2D sheets. Complexes containing coligands that occupy the equatorial coordination sites, Cu(2,2′‐py2NH)2(cdm)2]? 2MeOH, Ni(cyclam)(cdm)2], and Cu(cyclam)(cdm)2]?2MeOH (cyclam=1,4,8,11‐tetraazacyclotetradecane, 2,2′‐py2NH=di(2‐pyridyl)amine), show retention of the heterotape motif, whilst the ethylene diamine complex Cu‐(en)2(cdm)2] (en=ethylene diamine) displays an alternative hydrogen‐bonding motif due to interference from the diamine ligands. |
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| Keywords: | crystal engineering hydrogen bonds self‐assembly supramolecular synthons tape structures |
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