Alexandra L. Pickering

The importance of π–π, π–CH and N–CH interactions in the crystal packing of Schiff-base derivatives of cis,cis- and cis,trans-1,3,5-triaminocyclohexane

The crystal structures of cis,trans-1,3,5-tris-benzaldimino-cyclohexane (trans-tbc, 1), cis,trans-1,3,5-tris-(pyridine-2-carboxaldimino)-cyclohexane (trans-ttop, 2), cis,cis-1,3,5-tris-(pyridine-3-carboxaldimino)-cyclohexane (cis-mttop, 3) and cis,trans-1,3,5-tris-(pyridine-4-carboxaldimino)-cyclohexane (trans-pttop, 4) are reported. The arrangements of the molecules forming the packed arrays are controlled by the interplay of several different weak intermolecular interactions: π–π stacking, C–H⋯π and C–H⋯N interactions, and these are in turn related to differences in the stereochemistry around the cyclohexane backbone, as well as the positioning of the pyridyl–nitrogen to determine the overall supramolecular arrangement of these molecules in the solid state.

Monitoring the formation of coordination complexes using electrospray mass spectrometry.

cis,trans-1,3,5-Triaminocyclohexane (trans-tach) has been shown to be an excellent ligand in the synthesis of discrete complexes, molecular clusters, and infinite architectures. Herein, we report the Schiff-base derivitization of trans-tach to form cis,trans-1,3,5-tris (pyridine-2-carboxaldimino) cyclohexane (ttop), and the complexation of this ligand with copper(II) salts. The complexation reaction leads to the crystallization of transition-metal complexes with nuclearities of 1, 2, and 4, and the formation of the complexes can be followed stepwise, in real time, using electrospray mass spectrometry.

Polymeric silver(I) coordination tubes

Isolated polymeric Ag(I) coordination tubes are self-assembled from the rigid triamino ligands cis,cis-1,3,5-triaminocyclohexane (cis-tach) and cis,trans-1,3,5-triaminocyclohexane (trans-tach), forming two topologically equivalent framework motifs.