Novel Capsular Aggregates from Flexible Tripodal Triureas with Cs Symmetry (2012)
Journal Article
Alajarin, M., Orenes, R., Howard, J. A., Spencer, E. C., Steed, J. W., & Pastor, A. (2012). Novel Capsular Aggregates from Flexible Tripodal Triureas with Cs Symmetry. Chemistry - A European Journal, 18(8), 2389-2397. https://doi.org/10.1002/chem.201102246

Tris(2‐ and 3‐ureidobenzyl)amines with Cs symmetry self‐assemble in solution forming mixtures of regioisomeric capsular aggregates, one of which is chiral and the other centrosymmetric. Under certain conditions, a predominance of the centrosymmetric... Read More about Novel Capsular Aggregates from Flexible Tripodal Triureas with Cs Symmetry.

Anion-binding mode in a sulfanylphenyl urea complex : solid state symmetry breaking and solution chelation. (2006)
Journal Article
Russell, J., Parker, A., Radosavljevic-Evans, I., Howard, J., & Steed, J. (2006). Anion-binding mode in a sulfanylphenyl urea complex : solid state symmetry breaking and solution chelation. CrystEngComm, 8(2), 119-122. https://doi.org/10.1039/b516962c

An anion-bridged, hydrogen bonded coordination polymer apparently adapts its symmetry to form a Z′ = 1 or 2 structure according to the hydrogen bonding demands of the anion, and in solution there is evidence for a discrete anion-binding coordination... Read More about Anion-binding mode in a sulfanylphenyl urea complex : solid state symmetry breaking and solution chelation..

Simultaneous anion and cation binding by a simple polymer-bound ureidopyridyl ligand. (2006)
Journal Article
Russell, J., Parker, A., Radosavljevie-Evans, I., Howard, J., & Steed, J. (2006). Simultaneous anion and cation binding by a simple polymer-bound ureidopyridyl ligand. Chemical Communications, 2006(3), 269-271. https://doi.org/10.1039/b513820e

A polymer-supported ligand capable of simultaneous anion and cation binding is reported along with X-ray crystallographic data showing potential binding modes.

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.

Anion binding by Ag(I) complexes of urea-substituted pyridyl ligands (2005)
Journal Article
Turner, D., Smith, B., Spencer, E., Goeta, A., Evans, I., Tocher, D., …Steed, J. (2005). Anion binding by Ag(I) complexes of urea-substituted pyridyl ligands. New Journal of Chemistry, 29(1), 90-98

A series of Ag(I) complexes of ureidopyridyl ligands 1 and 2 have been prepared from oxo-anion salts. In all cases the new materials contain the AgL2+ cation interacting with oxo-anions via the urea moiety. The complexes containing the para ligand 2:... Read More about Anion binding by Ag(I) complexes of urea-substituted pyridyl ligands.

Modular nanometer-scale structuring of gel fibres by sequential self-organization (2005)
Journal Article
Applegarth, L., Clark, N., Richardson, A., Parker, A., Radosavljevic-Evans, I., Goeta, A., …Steed, J. (2005). Modular nanometer-scale structuring of gel fibres by sequential self-organization. Chemical Communications, 5423-5425

Ag(I) and Cu(II) complexes of a series of simple bis( urea) ligands form soft metallogels. X-ray crystallographic results suggests that the gels' structure is based on hydrogen bonding to counter anions and thus suggests a route to tunable gel rheolo... Read More about Modular nanometer-scale structuring of gel fibres by sequential self-organization.

The R-1(2)(6) hydrogen-bonded synthon in neutral urea and metal-bound halide systems (2004)
Journal Article
Turner, D., Smith, B., Goeta, A., Evans, I., Tocher, D., Howard, J., & Steed, J. (2004). The R-1(2)(6) hydrogen-bonded synthon in neutral urea and metal-bound halide systems. CrystEngComm, 6, 633-641

The recurrence of the R-1(2)(6) motif between urea and metal bound halides is explored through studies in the CSD, including examples of the closely related thiourea and guanidine-based structures. A series of compounds containing the isomeric pyridy... Read More about The R-1(2)(6) hydrogen-bonded synthon in neutral urea and metal-bound halide systems.

A modular, self-assembled, separated ion pair binding system (2004)
Journal Article
Turner, D., Spencer, E., Howard, J., Tocher, D., & Steed, J. (2004). A modular, self-assembled, separated ion pair binding system. Chemical Communications, 1352-1353

Assembly of a silver(I) complex of a simple pyridyl ligand containing a urea derivative is templated by nitrate; analogous complexes of Ag2SO4 and AgCF3SO3 exhibit radically different geometries.