Supramolecular dynamics: Synthesis, structure and novel properties of silver(I) benzamido pyridine complexes and copper(II) cubane assemblies
The synthesis and characterization of 17 crystal structures containing a new molecular scaffolds based on bis[L] silver (I), namely [Ag(L)2]X, where L = N-(4-pyridyl)benzamide (NPBA) and N-Phenyl-isonicotinamide (NPI), X = NO3−, PF6−, BF4−, ClO4−, CF3SO3 −, and p-toluenesulfonate was studied that result in molecular solids with 1-, 2- and 3-D non-covalent networks. These molecular solids provided a library from which one was discovered to exhibit single-crystal to single-crystal transformations and revealed information about supramolecular dynamics in the solid-state. We demonstrated that crystal systems that do not maximize their supramolecular contacts in the solid-state may exhibit reversible phase change behavior at higher temperatures. We proposed that this results will have an impact in the area of crystal polymorphism that procures the generation of new crystal systems with higher stability in order to increase % yield in the bulk manufacture of fine chemicals. ^ We also report the synthesis and structural characterization of molecular magnets based on copper(II) cubane clusters. They magnetic properties were studied from 300 to 4 K. We observed that a set of hydrogen bonds stabilized the cubane structure. We designed experiments that showed that this supramolecular stabilization was key to the isolation and characterization of the Cu system. ^
Lopez-Cruz, Nazario, "Supramolecular dynamics: Synthesis, structure and novel properties of silver(I) benzamido pyridine complexes and copper(II) cubane assemblies" (2004). ETD Collection for University of Texas, El Paso. AAIEP10800.