A novel three dimensional samarium(III) coordination polymer with an unprecedented coordination mode of the 2,5-pyridinedicarboxylic acid ligand: Hydrothermal synthesis, crystal structure and luminescence property

A Series of Lanthanide-Based Metal–Organic Frameworks Derived from Furan-2,5-dicarboxylate and Glutarate: Structure-Corroborated Density Functional Theory Study, Magnetocaloric Effect, Slow Relaxation of Magnetization, and Luminescent Properties

“…The vibrational bands in the 1275–1058 cm –1 region are assigned to ring vibrations of the rigid 2,5-FDA 2– ligand. The Ln III –O bonds in assembled Ln-MOFs can be ascertained by IR spectral bands ranging from 920 to 450 cm –1 . − The weaker-intensity IR spectral bands in the 2989–2830 cm –1 region are assigned to the asymmetric stretching vibrational modes of the furan ring and characteristic ν C–H vibrational modes of −CH 2 – groups within the carbon chain of glutaric acid.…”

“…The 4f → 4f transitions are Laporte-forbidden transitions and, hence, display weaker molar absorptivities, so it is hard to excite them . To overcome this difficulty, Ln-MOFs are designed by using photoluminescent π-conjugated di/polycarboxylates ligands such as thiophenedicarboxylic, − pyridinedicarboxylic, − furan-2,5-dicarboxylic, − isophthalic, , terephthalic, − and naphthalenedicarboxylic − acids. These organic linkers display an “antenna effect”, thereby harvesting quanta of photoenergy, followed by transfer of the harvested light to the Ln III ion centers in assembled Ln-MOFs.…”

“…Reports on MOFs or coordination polymers (CPs) with Ln ions are limited compared with transition metals. − Ln ions have unique electronic properties by virtue of which they show high and versatile coordination numbers. The strong spin–orbit coupling and large magnetic moments endow their potential applications in magnetic resonance imaging and luminescent sensing in particular. − Ln-MOFs show special optical features with characteristic sharp lines, optical color purity, and luminescent properties usually unaffected by the ligand field. , Also, trivalent Ln III -MOFs can be considered to be promising molecular magnetic materials because they have large magnetic anisotropy and strong spin–orbit coupling except for gadolinium­(III)-based MOFs. , Among the organic linkers used for the construction of Ln-MOFs, rigid polycarboxylates such as furandicarboxylic, − thiophenedicarboxylic, − pyridinedicarboxylic, − isophthalic, , terephthalic, − 2,6-naphthalenedicarboxylic, − and trimesic − acids are of special interest. They have been widely exploited for the synthesis of Ln-MOFs.…”

In situ surface film evolution during Mg aqueous corrosion in presence of selected carboxylates

“…However, formation of a specific network of the organic molecules which contains a chain of alternating double and single bonds, called conjugation, or π-electron delocalization can cause fluorescence [79,80]. It was reported that PDC can form so-called coordination polymer with different dimensionality, consisting of the long chains of PDC molecules bonded due to the electrostatic interaction with metal ions [80][81][82]. Many of reported coordination polymers have fluorescent properties [46,80,83].…”

Electrochemical DNA biosensor based on poly(2,6-pyridinedicarboxylic acid) modified glassy carbon electrode for the determination of anticancer drug gemcitabine

“…In the spectrum of P(PDCA), the characteristic bands between 1728 and 1644 cm −1 were assigned to the stretching vibration of the C=O group [28]. The band observed at 1611 cm −1 was attributed to the C=C/C-C and C-N/C=N stretching vibrations of the pyridine ring [29][30][31]. The band at approximately 1553 cm −1 may be ascribed to the C=C, C=N and asymmetric COO − stretching vibrations in the PDCA unit [32,33].…”