Interpretation of the mechanisms of chromatographic separation on CN-silica. Part I: TLC of metal complexes
Abstract
The chromatographic behavior of four mixed tris(beta-diketonato) complexes of the type [Co(acac)(3-n)(phacphac)(n)] (n = 0-3), three (beta-ketoiminato)-Cu(II) complexes, two tris(alkylxanthato)-Co(III) complexes, and five bis(alkylxanthato)-Ni(II) complexes has been studied on thin layers of CN-silica gel with fifteen mobile phases, thirteen of which resulted in normal-phase systems. Linear relationships were established between the R, values of tris(beta-diketonato) complexes and the amount [% nu/nu] of acetone in hexane-acetone mobile phases, and between the R-M values of these complexes and the number of acac ligands substituted by phacphac ligands. The results obtained were compared with previously observed chromatographic behavior of the same substances on thin layers of silica gel and polyacrylonitrile. The corresponding separation mechanisms were also considered. It was assumed that under conditions of normal-phase chromatography with solvents of low polarity the retention behav...ior of complexes containing aromatic rings in the molecule is mainly determined by donor-acceptor interactions of the cyano groups of the adsorbent with the pi-electron systems of the substances being separated.
Keywords:
thin-layer chromatography / separation mechanisms / CN-modified silica / alkylxanthato complexes / (beta-ketoiminato)-Cu(II) complexes / (beta-diketonato)-Co(III) complexesSource:
JPC-Journal of Planar Chromatography-Modern TLC, 2002, 15, 5, 341-344Publisher:
- Springer Heidelberg, Heidelberg
DOI: 10.1556/JPC.15.2002.5.4
ISSN: 0933-4173
WoS: 000180118300004
Scopus: 2-s2.0-0842326775
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Institution/Community
Istraživačko razvojni institut TAMIŠTY - JOUR AU - Majstorović, Helena AU - Tešić, Živoslav AU - Milojković-Opsenica, Dušanka PY - 2002 UR - https://intam.institut-tamis.rs/handle/123456789/136 AB - The chromatographic behavior of four mixed tris(beta-diketonato) complexes of the type [Co(acac)(3-n)(phacphac)(n)] (n = 0-3), three (beta-ketoiminato)-Cu(II) complexes, two tris(alkylxanthato)-Co(III) complexes, and five bis(alkylxanthato)-Ni(II) complexes has been studied on thin layers of CN-silica gel with fifteen mobile phases, thirteen of which resulted in normal-phase systems. Linear relationships were established between the R, values of tris(beta-diketonato) complexes and the amount [% nu/nu] of acetone in hexane-acetone mobile phases, and between the R-M values of these complexes and the number of acac ligands substituted by phacphac ligands. The results obtained were compared with previously observed chromatographic behavior of the same substances on thin layers of silica gel and polyacrylonitrile. The corresponding separation mechanisms were also considered. It was assumed that under conditions of normal-phase chromatography with solvents of low polarity the retention behavior of complexes containing aromatic rings in the molecule is mainly determined by donor-acceptor interactions of the cyano groups of the adsorbent with the pi-electron systems of the substances being separated. PB - Springer Heidelberg, Heidelberg T2 - JPC-Journal of Planar Chromatography-Modern TLC T1 - Interpretation of the mechanisms of chromatographic separation on CN-silica. Part I: TLC of metal complexes EP - 344 IS - 5 SP - 341 VL - 15 DO - 10.1556/JPC.15.2002.5.4 UR - conv_144 ER -
@article{ author = "Majstorović, Helena and Tešić, Živoslav and Milojković-Opsenica, Dušanka", year = "2002", abstract = "The chromatographic behavior of four mixed tris(beta-diketonato) complexes of the type [Co(acac)(3-n)(phacphac)(n)] (n = 0-3), three (beta-ketoiminato)-Cu(II) complexes, two tris(alkylxanthato)-Co(III) complexes, and five bis(alkylxanthato)-Ni(II) complexes has been studied on thin layers of CN-silica gel with fifteen mobile phases, thirteen of which resulted in normal-phase systems. Linear relationships were established between the R, values of tris(beta-diketonato) complexes and the amount [% nu/nu] of acetone in hexane-acetone mobile phases, and between the R-M values of these complexes and the number of acac ligands substituted by phacphac ligands. The results obtained were compared with previously observed chromatographic behavior of the same substances on thin layers of silica gel and polyacrylonitrile. The corresponding separation mechanisms were also considered. It was assumed that under conditions of normal-phase chromatography with solvents of low polarity the retention behavior of complexes containing aromatic rings in the molecule is mainly determined by donor-acceptor interactions of the cyano groups of the adsorbent with the pi-electron systems of the substances being separated.", publisher = "Springer Heidelberg, Heidelberg", journal = "JPC-Journal of Planar Chromatography-Modern TLC", title = "Interpretation of the mechanisms of chromatographic separation on CN-silica. Part I: TLC of metal complexes", pages = "344-341", number = "5", volume = "15", doi = "10.1556/JPC.15.2002.5.4", url = "conv_144" }
Majstorović, H., Tešić, Ž.,& Milojković-Opsenica, D.. (2002). Interpretation of the mechanisms of chromatographic separation on CN-silica. Part I: TLC of metal complexes. in JPC-Journal of Planar Chromatography-Modern TLC Springer Heidelberg, Heidelberg., 15(5), 341-344. https://doi.org/10.1556/JPC.15.2002.5.4 conv_144
Majstorović H, Tešić Ž, Milojković-Opsenica D. Interpretation of the mechanisms of chromatographic separation on CN-silica. Part I: TLC of metal complexes. in JPC-Journal of Planar Chromatography-Modern TLC. 2002;15(5):341-344. doi:10.1556/JPC.15.2002.5.4 conv_144 .
Majstorović, Helena, Tešić, Živoslav, Milojković-Opsenica, Dušanka, "Interpretation of the mechanisms of chromatographic separation on CN-silica. Part I: TLC of metal complexes" in JPC-Journal of Planar Chromatography-Modern TLC, 15, no. 5 (2002):341-344, https://doi.org/10.1556/JPC.15.2002.5.4 ., conv_144 .