Friday, October 31, 2014; 3:00 p.m.; LSci 175
Department of Chemistry & Biochemistry Welcomes:
Dr. Milan Balaz
Assistant Professor of Chemistry, University of Wyoming
“DNA-Templated Porphyrin Nanoassemblies with Tunable Structural and Electronic Properties”
Chiroptical organometallic nanomaterials have great potential for applications in chiral memory, data storage, biological sensing, and optical communication. Porphyrins are among the most frequently utilized building blocks in supramolecular engineering owing to their modular photophysical and structural properties, high stability, and accessible synthetic routes. Short DNA sequences gained prominence in templated bottom-up nanofabrication of supramolecular polymers, as their structure can be easily translated into linear helical multichromophoric nanoladders via complementary hydrogen bonding. This lecture will present synthesis, self-assembly, stability, optical and chiroptical properties of left-handed and right-handed porphyrin and metalloporphyrin nanoassemblies formed on a single stranded DNA (ssDNA) template via directional hydrogen bonding.[1,2] High resolution transition electron microscopy has confirmed formation of DNA-templated metalloporphyrin nanoassemblies and their self-assembly into helical fibrils with micrometer lengths. The lecture will also describe how the helicity of ssDNA-templated porphyrin and metalloporphyrin nanoarrays can be controlled and switched using external stimuli.