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Article

Structural and Antimicrobial Characterization of Co-Crystal [Ni(bpy)(acr)2(H2O)]·MA

by
Rodica Olar
1,
Constantin G. Daniliuc
2,
Gina Vasile Scăețeanu
3,
Romana Cerc Korosec
4,
Nataša Čelan Korošin
4,
Mariana Carmen Chifiriuc
5,6 and
Mihaela Badea
1,*
1
Department of Inorganic Chemistry, Faculty of Chemistry, University of Bucharest, 90–92 Panduri Str., 050663 Bucharest, Romania
2
Organisch-Chemisches Institut, Westfälische Wilhelms-Universität Münster, Corrensstrasse 40, 48149 Munich, Germany
3
Department of Soil Sciences, University of Agronomical Sciences and Veterinary Medicine, 59 Mărăști Str., 011464 Bucharest, Romania
4
Department of Inorganic Chemistry, Faculty of Chemistry and Chemical Technology, University of Ljubljana, Večna pot 113, 1000 Ljubljana, Slovenia
5
Department of Microbiology, Faculty of Biology, University of Bucharest, 1–3 Aleea Portocalelor Str., 060101 Bucharest, Romania
6
Academy of Romanian Scientists, 010071 Bucharest, Romania
*
Author to whom correspondence should be addressed.
Crystals 2022, 12(8), 1078; https://doi.org/10.3390/cryst12081078
Submission received: 29 June 2022 / Revised: 26 July 2022 / Accepted: 29 July 2022 / Published: 1 August 2022
(This article belongs to the Section Hybrid and Composite Crystalline Materials)
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Abstract

A new co-crystal with the formula [Ni(bpy)(acr)2(H2O)]·MA (bpy = 2,2′-bipyridine, acr = acrylate and MA = melamine) has been synthesized and characterized using IR, UV-Vis, thermogravimetric analysis and single crystal X-ray diffraction. The complex contains discrete unities of [Ni(bpy)(acr)2(H2O)] and melamine linked in a complex network by both hydrogen bonds and π-π stacking interactions. Structural characterization revealed that Ni(II) adopts an octahedral distorted stereochemistry, and acrylate ions present both unidentate and chelate coordination modes. Thermal decomposition occurs in four steps, the ligands being stepwise released in the order of water, acrylate, bipyridine and melamine. The antimicrobial activity of the obtained complex, its precursor ([Ni(bpy)(acr)2(H2O)]) and melamine were assessed against planktonic (minimal inhibitory concentration—MIC) and biofilm-embedded (minimal biofilm eradication concentration—MBEC) Gram-positive and Gram-negative bacterial strains. The obtained results revealed that the new complex and its precursor exhibited a superior activity compared to MA, the highest susceptibility being recorded for the Staphylococcus aureus strain. The MIC and MBEC ranges were very similar, indicating the potential of this complex and its precursor to develop novel anti-biofilm agents.
Keywords: nickel complex; melamine; co-crystal; antimicrobial activity; anti-biofilm nickel complex; melamine; co-crystal; antimicrobial activity; anti-biofilm

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MDPI and ACS Style

Olar, R.; Daniliuc, C.G.; Vasile Scăețeanu, G.; Cerc Korosec, R.; Čelan Korošin, N.; Chifiriuc, M.C.; Badea, M. Structural and Antimicrobial Characterization of Co-Crystal [Ni(bpy)(acr)2(H2O)]·MA. Crystals 2022, 12, 1078. https://doi.org/10.3390/cryst12081078

AMA Style

Olar R, Daniliuc CG, Vasile Scăețeanu G, Cerc Korosec R, Čelan Korošin N, Chifiriuc MC, Badea M. Structural and Antimicrobial Characterization of Co-Crystal [Ni(bpy)(acr)2(H2O)]·MA. Crystals. 2022; 12(8):1078. https://doi.org/10.3390/cryst12081078

Chicago/Turabian Style

Olar, Rodica, Constantin G. Daniliuc, Gina Vasile Scăețeanu, Romana Cerc Korosec, Nataša Čelan Korošin, Mariana Carmen Chifiriuc, and Mihaela Badea. 2022. "Structural and Antimicrobial Characterization of Co-Crystal [Ni(bpy)(acr)2(H2O)]·MA" Crystals 12, no. 8: 1078. https://doi.org/10.3390/cryst12081078

APA Style

Olar, R., Daniliuc, C. G., Vasile Scăețeanu, G., Cerc Korosec, R., Čelan Korošin, N., Chifiriuc, M. C., & Badea, M. (2022). Structural and Antimicrobial Characterization of Co-Crystal [Ni(bpy)(acr)2(H2O)]·MA. Crystals, 12(8), 1078. https://doi.org/10.3390/cryst12081078

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