Laser techniques and photochemistry find elusive molecular building block

Laser techniques and photochemistry find elusive molecular building block
Molecule and scheme courtesy of Cheng Zhu and Ralf I. Kaiser. Credit: Gerd Altmann

A key molecular building block in phosphorus chemistry has been elusive, until now. University of Hawaiʻi at Mānoa researchers have discovered a simple and versatile way to identify the Hückel aromatic cyclotriphosphazene molecule along with its isomer (which has the same molecular formula, but differs structurally).

According to the research team and authors—UH Mānoa Department of Chemistry Professor Ralf I. Kaiser, postdoctoral fellow Cheng Zhu, visiting researcher André K. Eckhardt, postdoctoral fellow Alexandre Bergantini, postdoctoral fellow Santosh K. Singh, and Professor Peter R. Schreiner from Justus Liebig University Giessen in Germany—the study published in Science Advances represents fundamental chemistry research on and . It highlights the differences and similarities between aromatic inorganic and .

Researchers said dendrimers (repetitively branched ) based on the cyclotriphosphazene molecule detected in this study can be used in nanomaterials, biomolecule carriers, chemical sensors, antibacterial agents, reusable catalysts, and medical imaging agents.

Key discovery

Kaiser and Zhu outlined that the cyclotriphosphazene molecule and its Dewar-benzene-type isomer were prepared within low temperature matrices of ammonia and phosphine ices exposed to ionizing radiation. Using UH Mānoa W.M. Keck Research Laboratory in Astrochemistry's advanced photoionization, mass spectrometric devices, both species were identified, observed, and analyzed. This cannot be achieved currently with traditional synthetic techniques.

"The finding helps to understand the and chemical bonding of exotic inorganic molecules and how they relate to their classical organic counterparts," Zhu said.

Next steps

Kaiser and Zhu said they are planning to identify more exotic isomers such as high energy density, hexaatomic prismatic molecules containing phosphorus and nitrogen. Researchers said these have been predicted computationally, but have not yet been detected experimentally.

More information: Cheng Zhu et al. The elusive cyclotriphosphazene molecule and its Dewar benzene–type valence isomer (P3N3), Science Advances (2020). DOI: 10.1126/sciadv.aba6934

Journal information: Science Advances

Citation: Laser techniques and photochemistry find elusive molecular building block (2020, July 23) retrieved 13 April 2024 from
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