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Cadmium(II) and zinc(II) complexes based on 2-morpholine-pyridine-4-carboxylic acid: syntheses and structures

  • Hong-Hong Lan and Shao-Bin Miao EMAIL logo
Published/Copyright: September 5, 2025
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Zeitschrift für Naturforschung B
From the journal Zeitschrift für Naturforschung B

Abstract

The complexes [Cd(mpca·H)Cl2] · H2O (1) and [Zn(mpca·H)Cl2] (2) have been synthesized and characterized by single-crystal and IR spectroscopya (mpcaH = 2-morpholine-pyridine-4-carboxylic acid). Both complexes crystallize in the triclinic space group P 1 ‾ , and the cadmium and zinc ions exhibit distorted trigonal bipyramidal and tetrahedral coordination geometries, respectively. In compound 1, the carboxylate moieties show different μ1-η1:η1 and μ1-η1:η0 coordination modes, while in 2, only the μ1-η1:η0 mode is observed.

Keywords: cadmium; zinc; coordination complexes; 2-morpholine-pyridine-4-carboxylic acid; crystal structure
Corresponding author: Shao-Bin Miao, Henan Key Laboratory of Function-Oriented Porous Materials, College of Chemistry and Chemical Engineering, Luoyang Normal University, Luoyang, Henan Province, 471934, P.R. China, E-mail:

Acknowledgments

The authors thank Dr. J.-G. Wang for recording the single-crystal data.

  1. Research ethics: Not applicable.

  2. Informed consent: Not applicable.

  3. Author contributions: The authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.

  4. Use of Large Language Models, AI and Machine Learning Tools: None declared.

  5. Conflict of interest: The authors declare no conflicts of interest regarding this article.

  6. Research funding: None declared.

  7. Data availability: The raw data can be obtained on request from the corresponding author.

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Received: 2025-03-20
Accepted: 2025-07-15
Published Online: 2025-09-05

© 2025 Walter de Gruyter GmbH, Berlin/Boston

https://doi.org/10.1515/znb-2025-0026
Keywords for this article
cadmium; zinc; coordination complexes; 2-morpholine-pyridine-4-carboxylic acid; crystal structure
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