Abstract: We present a series of Zn(II) and Co(II) coordination polymers containing two types of ligands: sterically rigid terephthalate derivatives (bdc-NO22- and bdc-Br2-) and flexible bis(2-methylimidazolyl)propane (bmip). The combination of two types of ligands possessed to obtain and characterize both single and mixed-metal compounds by single crystal and powder X-Ray diffraction, FT-IR, and elemental analysis. These 4-fold interpenetrated frameworks have a diamond topology and do not reveal any structural transformations despite the presence of flexible ligand. Luminescence spectra for all Zn-containing compounds were recorded. All compounds exhibit a strong dependence of emission maxima on excitation wavelength, which is characteristic for bmip ligand and is enhanced in coordination polymers. Compound [Zn(bdc-Br)(bmip)] demonstrate bright luminescence with high quantum yield of 39 %. Mixed-metal Zn(II)/Co(II) compounds have redshifted luminescence in comparison to [Zn(bdc-NO2)(bmip)] and compound [Zn0.6Co0.4(bdc-NO2)(bmip)] is characterized by near white emission under 460~nm excitation.

Cite: Burlak P.V. , Samsonenko D.G. , Kovalenko K.A. , Fedin V.P.
Structural polymorphism and luminescence properties of zinc(II) and cobalt(II) MOFs with rigid and flexible ligands
CrystEngComm. 2024. V.26. P.5039-5045. DOI: 10.1039/d4ce00573b WOS Scopus РИНЦ OpenAlex

Dates:

Submitted:	Jun 7, 2024
Accepted:	Jul 23, 2024
Published print:	Jul 28, 2024
Published online:	Jul 28, 2024

Identifiers:

Web of science:	WOS:001296355700001
Scopus:	2-s2.0-85201913561
Elibrary:	74059745
OpenAlex:	W4401064074

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