ABSTRACT
Hydrolysis of 'tris(aryl or alkyl)gallium(III)' species results in the formation of spheroidal dodecameric galloxane mixed oxide-hydroxide clusters, and shows that the gallium centres and associated residual alkyl/aryl groups are arranged at the polyhedral vertices of pseudo-icosahedra.
Subject(s)
Gallium/chemistry , Hydrogen Bonding , Models, Molecular , X-Ray DiffractionABSTRACT
A template-directed strategy to forming a bis(diimide) macrocycle through an intermediate asymmetric [2]catenane is reported. Saponification of the ester linkages within the crown ether component is much slower in the mechanically interlocked structure when compared to the free crown. The predominance of a single translational isomer leads to a dimeric structure, resulting in the generation of infinite channels within the crystal lattice. [structure: see text]
ABSTRACT
A mixture of a Ni(TMTAA) grafted crown ether and Cs[Co(C2B9H11)2] in toluene-CH2Cl2 affords a 1:1 complex, comprised of layers of infinite two-dimensional polymeric arrays separated by layers of the cobalticarborane anion which themselves form two B-H...Cs+ hydrogen interactions.
ABSTRACT
[reaction: see text] The crystal and molecular structures of two six-coordinate tin(IV)porphyrin phenolate complexes show that infinite cylindrical channels of uniform pore dimension are formed along the crystallographic c-direction. The underlying recognition event responsible for the porosity is an extremely tight intermeshing of the meso-tolyl units between layers which is a result of Sn-O...H interactions. Thermogravimetric analysis and differential scanning calorimetry have been used to characterize the sieve-like materials.
