Effect of the Nature of Donor Atoms on the Thermodynamic, Kinetic and Relaxation Properties of Mn(II) Complexes Formed With Some Trisubstituted 12-Membered Macrocyclic Ligands

Frontiers in Chemistry
Zoltán GardaGyula Tircsó

Abstract

During the past few years increasing attention has been devoted to Mn(II) complexes as possible substitutes for Gd(III) complexes as contrast agents in MRI. Equilibrium (log KMnL or pMn value), kinetic parameters (rates and half-lives of dissociation) and relaxivity of the Mn(II) complexes formed with 12-membered macrocyclic ligands were studied. The ligands were selected in a way to gain information on how the ligand rigidity, the nature of the donor atoms in the macrocycle (pyridine N, amine N, and etheric O atom), the nature of the pendant arms (carboxylates, phosphonates, primary, secondary and tertiary amides) affect the physicochemical parameters of the Mn(II) complexes. As expected, decreasing the denticity of DOTA (to afford DO3A) resulted in a drop in the stability and inertness of [Mn(DO3A)]- compared to [Mn(DOTA)]2-. This decrease can be compensated partially by incorporating the fourth nitrogen atom into a pyridine ring (e.g., PCTA) or by replacement with an etheric oxygen atom (ODO3A). Moreover, the substitution of primary amides for acetates resulted in a noticeable drop in the stability constant (PC3AMH), but it increased as the primary amides (PC3AMH) were replaced by secondary (PC3AMGly) or tertiary amide (PC3A...Continue Reading

References

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Citations

Dec 29, 2020·Dalton Transactions : an International Journal of Inorganic Chemistry·Oriol Porcar-TostRosa M Ortuño
Jul 28, 2020·Inorganic Chemistry·Kristof PotaKayla N Green
May 7, 2020·Journal of Medicinal Chemistry·Ferenc K KalmanGyula Tircso
Jan 14, 2020·Journal of the American Chemical Society·Richárd BotárGyula Tircsó
Jan 7, 2022·Dalton Transactions : an International Journal of Inorganic Chemistry·Paulo Pérez-LouridoLaura Valencia

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Methods Mentioned

BETA
NMR
X-ray

Software Mentioned

Micromath Scientist
PSEQUAD

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