Supramolecular diversity in metal–organic hybrids with $[VO_2(2,6-pydc)]^−$ anion and piperazine and its derivatives

Hozjan, Mišel (author), Perdih, Franc (author)

Ten compounds have been prepared among them six different dioxido(pyridine-2,6-dicarboxylato)vanadate(V) compounds with piperazinium (H$_2$pip$^{2+}$) (1·6H$_2$O), methylpiperazinium (H$_2$mepip$^{2+}$) (2·5H$_2$O), ethylpiperazinium (H$_2$etpip$^{2+}$) (3·3H$_2$O), isopropylpiperazinium (H$_2$isopip$^{2+}$) (4·H$_2$O), phenylpiperazinium (Hphepip$^+$) (5∙H$_2$O) and thiomorpholinium 1-oxide (HtmorO$^+$) (6·2,6-H$_2$pydc·2H$_2$O) cations as counterions as well as methylpiperazinium (H$_2$mepip$^{2+}$) salt of a mixed valence vanadium [VO(2,6-pydc)-(μ-O)-VO(H$_2$O)(2,6-pydc)]$^−$ complex (7), thiomorpholin-4-ium vanadate (Htmor)VO$_3$ (8), hexa(thiomorpholin-4-ium) decavanadate hexahydrate (Htmor)$_6$[V$_{10}$O$_{28}$]·6H$_2$O (9·6H$_2$O) and organic salt cocrystal thiomorpholin-4-ium 6-carboxypicolinate pyridine-2,6-dicarboxylic acid (Htmor)$^+$(2,6-Hpydc)$^−$∙(2,6-H$_2$pydc)·2H$_2$O (10·2H$_2$O) via different pathways starting either from pyridine-2,6-dicarboxylic acid or its esters, and were structurally characterized by single-crystal X-ray diffraction. Extended hydrogen bonding interactions are present due to the presence of organic cations as well as due to the diverse roles of water molecules in the hydrogen bonding network. Centrosymmetric hydrogen bonding was found to be an important motif, and diverse supramolecular patterns were also observed due to a wide variety of C–H···O and π···π interactions stabilizing the crystal lattices.

• Language: English
• Keywords: vanadium, metal complexes, supramolecular interactions, crystal structure
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: FKKT - Faculty of Chemistry and Chemical Technology
• Publication status: Published
• Publication version: Version of Record
• Year: 2026
• Number of pages: 21 str.
• Numbering: Vol. 18, iss. 4, art. 679
• PID: 20.500.12556/RUL-182366
• UDC: 546.881:547.82:544.1
• ISSN on article: 2073-8994
• DOI: 10.3390/sym18040679
• COBISS.SI-ID: 277401091
• Publication date in RUL: 08.05.2026

Record is a part of a journal

• Title: Symmetry
• Shortened title: Symmetry
• Publisher: MDPI
• ISSN: 2073-8994
• COBISS.SI-ID: 517592345

Licences

• License: CC BY 4.0, Creative Commons Attribution 4.0 International
• Link: http://creativecommons.org/licenses/by/4.0/
• Description: This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.

Secondary language

• Language: Slovenian
• Keywords: vanadij, kovinski kompleksi, supramolekularne interakcije, kristalna struktura

Projects

• Funder: ARIS - Slovenian Research and Innovation Agency
• Project number: P1-0175
• Name: Napredna anorganska kemija