Spontaneous assembly of a hinged coordination network
Article Abstract:
Crystals of (Ag(TCB)(CF3SO3)) and (Ag(TEB)CF3SO3) were prepared using AlB2 or ThSi2 crystals in which the atoms were replaced by ligands and metal ions whose bond geometry was trigonal. The molecular blocks used to assemble spontaneously into open hinged networks. Crystals of the AlB2 family with large and open voids, have negative coefficients of thermal expansion and show auxetic behaviour. The structure of [Ag(TCB)(CF3SO3)] is similar to that of CaCuP crystals but has no open channels. However, [Ag(TEB)CF3SO3] resembles LaPtSi crystals and has open channels which makes it porous to benzene exchange.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1995
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Carborod molecular scaffolding
Article Abstract:
Two research groups have invented a new form of rigid molecular scaffolding called carborods. M. Frederick Hawthorne and colleagues devised a carborod based on a 12-vertex carborane monomer with icosahedral symmetry. Josef Michl and colleagues achieved the same as well as an additional carborod developed from a 10-vertex carborane monomer with bicapped square antiprism geometry. These findings may open the way to a molecular construction kit that will enable chemists to build molecules by assembling individual atoms.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1993
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Biasing reaction pathways with mechanical force
Article Abstract:
The 'Constrained Geometries simulate External Force' method was used computationally to determine the effects of molecular deformation on trans and cis 1,2-dimethoxybenzocyclobutenes. It was found that when placed within long polymer strands, the trans and cis isomers of a 1,2-disubstituted benzocyclobutene undergo an ultrasound-induced electrocyclic ring opening in a formally conrotatory and formally disrotatory process respectively that yield identical products.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2007
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