Outputs (4)

Unusual variations in the incidence of Z ' > 1 in oxo-anion structures (2006)
Journal Article
Anderson, K., Goeta, A., Hancock, K., & Steed, J. (2006). Unusual variations in the incidence of Z ' > 1 in oxo-anion structures. Chemical Communications, 2006(20), 2138-2140. https://doi.org/10.1039/b602492k

A series of Cambridge Structural Database studies show that ionic species generally form low Z′ structures, even in those cases where charge assisted hydrogen bonding is a key feature, e.g. oxo-anion complexes. By introducing a competing π–π stacking... Read More about Unusual variations in the incidence of Z ' > 1 in oxo-anion structures.

When Z '=2 is better than Z '=1-supramolecular centrosymmetric hydrogen-bonded dimers in chiral systems (2006)
Journal Article
Anderson, K., Afarinkia, K., Yu, H., Goeta, A., & Steed, J. (2006). When Z '=2 is better than Z '=1-supramolecular centrosymmetric hydrogen-bonded dimers in chiral systems. Crystal Growth and Design, 6(9), 2109-2113. https://doi.org/10.1021/cg0603265

High Z‘ structures can be engineered by combining a molecule with one (or more) resolved chiral center(s) with a strongly directional supramolecular synthon with a preference for centrosymmetry because, in order to preserve the dimer motif, one or mo... Read More about When Z '=2 is better than Z '=1-supramolecular centrosymmetric hydrogen-bonded dimers in chiral systems.

Crystal engineering with ethynylbenzenes Part 2. Structures of 4-trimethylsilylethynyl-N,N-dimethylaniline, and 4-ethynyl-N,N-dimethylaniline with Z '=12 and a single-crystal to single-crystal phase transition at 122.5 +/- 2 K (2006)
Journal Article
Batsanov, A., Collings, J., Ward, R., Goeta, A., Porres, L., Beeby, A., …Marder, T. (2006). Crystal engineering with ethynylbenzenes Part 2. Structures of 4-trimethylsilylethynyl-N,N-dimethylaniline, and 4-ethynyl-N,N-dimethylaniline with Z '=12 and a single-crystal to single-crystal phase transition at 122.5 +/- 2 K. CrystEngComm, 8, 622-628. https://doi.org/10.1039/b606327f

The crystal and molecular structures of 4-ethynyl-N,N-dimethylaniline (1), and 4-(trimethylsilylethynyl)-N,N-dimethylaniline (2), have been obtained from X-ray diffraction data. Crystals of 1 exhibit a phase transition at 122.5 ± 2 K. Both polymorphs... Read More about Crystal engineering with ethynylbenzenes Part 2. Structures of 4-trimethylsilylethynyl-N,N-dimethylaniline, and 4-ethynyl-N,N-dimethylaniline with Z '=12 and a single-crystal to single-crystal phase transition at 122.5 +/- 2 K.

Helical or polar guest-dependent Z‘ = 1.5 or Z‘ = 2 forms of a sterically hindered bis(urea) clathrate. (2006)
Journal Article
Todd, A., Anderson, K., Byrne, P., Goeta, A., & Steed, J. (2006). Helical or polar guest-dependent Z‘ = 1.5 or Z‘ = 2 forms of a sterically hindered bis(urea) clathrate. Crystal Growth and Design, 6(8), 1750-1752. https://doi.org/10.1021/cg060318o

A sterically hindered bis(pyridylurea) species forms clathrates with water, methanol, and ethanol, all exhibiting unusual polar structures with Z‘ > 1. This crystal packing is due to the hindered geometry about the urea oxygen acceptor atoms.