Investigation of Two Zr-p-NO 2 Bn-DOTA Isomers via NMR and Quantum Chemical Studies

A combination of NMR studies and quantum chemical calculations were employed to investigate the structure and energetics of Zr chelates of pNO Bn-DOTA. We have demonstrated that two discrete regioisomeric chelates are generated during the complex formation. The nitrobenzyl substituent can adopt eith...

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Bibliographic Details
Published in:European journal of inorganic chemistry 2023-11, Vol.26 (32)
Main Authors: Lee, Yong Sok, O'Connor, Robert D, Vasalatiy, Olga
Format: Article
Language:English
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Summary:A combination of NMR studies and quantum chemical calculations were employed to investigate the structure and energetics of Zr chelates of pNO Bn-DOTA. We have demonstrated that two discrete regioisomeric chelates are generated during the complex formation. The nitrobenzyl substituent can adopt either an equatorial corner or side position on the macrocyclic ring. These regioisomers are incapable of interconversion and were isolated by HPLC. The corner isomer is more stable than the side, and the SAP conformer of both regioisomers is energetically more favorable than the corresponding TSAP conformer.
ISSN:1434-1948
1099-0682
DOI:10.1002/ejic.202300439