Synthesis, structural characterization and optical properties of two-dimensional Zn2+and Co2+coordination polymers based on 2,2-dimethylpentanedioic acid and bis(imidazole) ligands

KÖSE P., DEMİR S., ERER H., OĞUZLAR S., YEŞİLEL O. Z.

Journal of Molecular Structure, cilt.1367, 2026 (SCI-Expanded, Scopus) identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 1367
  • Basım Tarihi: 2026
  • Doi Numarası: 10.1016/j.molstruc.2026.146163
  • Dergi Adı: Journal of Molecular Structure
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Chemical Abstracts Core, Chimica, Compendex, INSPEC
  • Anahtar Kelimeler: 1,4-Bis(1H-imidazole-1-yl)butane, 1,4-Bis(1H-imidazole-1-ylmethyl)benzene, 2,2-Dimethylpentanedioic acid, Coordination polymers, Optical characterization
  • Eskişehir Osmangazi Üniversitesi Adresli: Evet

Özet

Three new coordination polymers were synthesized via hydrothermal reactions of Zn2+ and Co2+ salts with 2,2‑dimethylpentanedioic acid (H2dmpda) and bis(imidazole) ligands (pbix=1,4-bis(1H-imidazole-1-ylmethyl)benzene and bib=1,4-bis(1H-imidazole-1-yl)butane), resulting in {[Zn(µ‑dmpda)(µ‑pbix)]·1.5H₂O}n (1), {[Co(µ‑dmpda)(µ‑pbix)]·1.5H₂O}n (2), and [Zn(µ‑dmpda)(µ‑bib)]n (3). The compounds were characterized by elemental analysis, FT‑IR, SCXRD, PXRD, thermal analysis, and XPS, while their optical properties were examined using solid‑state diffuse reflectance and photoluminescence spectroscopy. SCXRD results show that 1 and 2 are isomorphous 2D frameworks with 3‑connected hcb topology, whereas 3 forms a distinct 2D sql‑type network. All metal centers adopt distorted tetrahedral geometries, as supported by τ4 analysis. The materials exhibit ligand‑based photoluminescence, with Zn2+ compounds showing stronger emission than the Co2+ analogue. Band‑gap evaluations indicate wide band‑gap semiconducting behavior for all frameworks. These findings demonstrate that combining flexible bis(imidazole) (pbix and bib) linkers with dmpda enables the construction of structurally robust 2D coordination polymers with tunable optical and electronic properties.