Toxic metal complexes of macrocyclic cyclen molecule - synthesis, structure and complexing properties

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11310%2F17%3A10360085" target="_blank" >RIV/00216208:11310/17:10360085 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.1080/00958972.2017.1305493" target="_blank" >https://doi.org/10.1080/00958972.2017.1305493</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1080/00958972.2017.1305493" target="_blank" >10.1080/00958972.2017.1305493</a>

Result language
angličtina
Original language name
Toxic metal complexes of macrocyclic cyclen molecule - synthesis, structure and complexing properties
Original language description
Toxic metal (Cd2+, Hg2+, Pb2+, and Ag+) complexes with the tetradentate macrocyclic ligand - cyclen (1,4,7,10-tetraazacyclododecane, [12]aneN(4), L) were prepared and studied in the solid state by IR, X-ray diffraction, elemental and thermal analysis. Diffraction results have yielded three molecular structures, [Cd([12]ane-N-4(1,4,7,10))(NO3)(2))] (1), [Hg([12]ane-N-4(1,4,7,10))(NO3-O-2,O')]NO3 (2), [Pb-2([12]ane-N-4(1,4,7,10))(2)][Pb(NO3)(6)] (3) and one polymeric structure {[Ag-2([12]ane-N-3(1,4,7))((2)-[12]aneN(10))](NO3)(2).2H(2)O)}(n) (4) featuring a unique coordination mode not observed before with cyclen as a ligand. The monodentate (1) and chelate (with small bite angle 50.3(3)degrees, (2) coordination modes of nitrate ligands were confirmed. Stereochemically active 6s(2) lone pair was suggested in 3 and DFT results confirmed no significant metal-metal covalent bond. The stability constants of the complexes with Cd2+ and Pb2+ ions were determined by potentiometric methods in aqueous solutions. Additionally, the structures of complexes in solution were observed by H-1 NMR. Both methods confirm similar cyclen complexing properties toward Zn2+ biometal and Cd2+, Pb2+ toxic metals.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10402 - Inorganic and nuclear chemistry

Project
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2017
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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