Synthesis, molecular weights and infrared spectra of some scandium(III) higher carboxylates

Parashar, G. K.; K., A.

doi:10.1007/bf01393505

Cited by 6 publications

(7 citation statements)

References 10 publications

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“…Figure b reveals the presence of two bands at 827 and 840 cm –1 . According to the literature, the first band corresponds to the Sc–O stretching mode. − Despite the lack of literature on comprehensive FTIR experimental characterization of the Sc(III)–N interactions, we assigned the second band at 840 cm –1 to the Sc(III)–N rocking vibrational mode by analogy with previous FTIR investigations on hexa-coordinated ammine-trivalent metal complexes including [Rh(NH 3 ) 6 ]Cl 3 , [Os(NH 3 )]Br 3 , [Ir(NH 3 ) 6 ]Cl 3 , [Cr(NH 3 ) 6 ] 3+ , and [Co(NH 3 ) 6 ]Cl 3 as reported by Griffith, Quagliano, and Gupta . These authors demonstrated that the M(III)–N rocking vibrational mode appears in the range of 740–860 cm –1 .…”

Section: Resultsmentioning

confidence: 99%

Ammonia Capture via an Unconventional Reversible Guest-Induced Metal-Linker Bond Dynamics in a Highly Stable Metal–Organic Framework

et al. 2021

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An unprecedented reversible guest-induced metallinker bond rearrangement in metal−organic framework (MOFs) was revealed by quantum-calculations and DRIFT experiments. As a showcase, the prototypical MOF-type MFM-300(Sc) was demonstrated to undergo a substantial Sc-carboxylate bond dynamics upon ammonia adsorption to enable a strong metal− guest binding mode, a key feature to ensure a highly efficient capture of this toxic molecule. Decisively, we evidenced this adsorption mechanism to be fully reversible, preserving the ammonia capture performance and structure integrity over multiple cycles. Such an unconventional mechanism in MOFs can open up new avenues to design novel materials for an efficient capture of highly corrosive molecules.

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Section: Resultsmentioning

confidence: 99%

Ammonia Capture via an Unconventional Reversible Guest-Induced Metal-Linker Bond Dynamics in a Highly Stable Metal–Organic Framework

et al. 2021

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“…Additional characterization techniques were used to gain a better understanding of the complexation between CL and Sc 3+ . The infrared (IR) spectra show a notable alteration in the −CO stretching vibrations (∼1700 cm –1 ), −C–O stretching vibrations (∼1250 cm –1 ), and −OH out-of-plane bending vibration (∼ 950 cm –1 ) following the addition of Sc 3+ (Figure a) . Furthermore, the −CO group of CL exists in four locations (Figure S1): one is substituted on benzene (site c), two are on tertiary amine (sites a and b), and site d is on xanthene.…”

Section: Resultsmentioning

confidence: 99%

“…The infrared (IR) spectra show a notable alteration in the −C�O stretching vibrations (∼1700 cm −1 ), −C−O stretching vibrations (∼1250 cm −1 ), and −OH out-of-plane bending vibration (∼ 950 cm −1 ) following the addition of Sc 3+ (Figure 2a). 43 Furthermore, the −C�O group of CL exists in four locations (Figure S1): one is substituted on benzene (site c), two are on tertiary amine (sites a and b), and site d is on xanthene. It is necessary to determine on which site the −C� O group complexes with Sc 3+ .…”

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confidence: 99%

Highly Selective and Portable Fluorescence Turn-On Detection of Sc³⁺ in Ore and Water Based on Strong Lewis Acid–Base Coordination

Chen,

Zhang,

et al. 2024

Anal. Chem.

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Detecting scandium (Sc) with high selectivity and sensitivity is a challenging task due to its chemical similarity to other rare earth ions. Our findings show that the fluorescence of the complex fluorescent indicator calcein (CL) is quenched under acidic conditions (pH = 2), and Sc 3+ strongly inhibits this process. The results demonstrate that CL forms multimers and precipitates out of the solution under acidic conditions, while Sc 3+ causes a significant decrease in the scattering intensity of the solution. Additional experiments revealed that the strong Lewis acid nature of Sc 3+ complexes with the carboxyl groups of CL leads to increased dispersion of CL even under acidic conditions, thus enhancing its absorption and fluorescence. The complexation ratio of Sc 3+ and CL was investigated through spectral titrations and theoretical calculations. The interaction between Sc 3+ and CL is the strongest among rare earth and common metal ions due to the smallest ionic radius, resulting in high selectivity. The fluorescence turn-on strategy had a linear range of 0.04 to 2.25 μM under optimal conditions, with a detection limit of 20 nM for Sc 3+ . The combination of 3D printing and a smartphone program allows for portable on-site analysis of Sc 3+ . Mineral and water samples were used to demonstrate the potential of this strategy for the rapid, selective, and sensitive analysis of low levels of Sc 3+ .

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“…1a). We identi ed 4aminophenylacetate as a suitable ligand for the scandium-containing secondary building units, given that Sc 3+ readily forms trigonally-symmetric complexes with carboxylates 29 , and further that energy minimization calculations indicated Sc(C 8 H 8 NO 2 ) 3 to be approximately the same size as the TpPa-1 repeat unit with pendant amine groups suitable for the formation of an extended TpPa-1-type structure (Fig. 1c).…”

Section: Resultsmentioning

confidence: 99%

Selective scandium ion capture through coordination templating in a covalent organic framework

et al. 2023

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The use of coordination complexes as building units within covalent organic frameworks (COFs) has signi cant potential to diversify the structures and properties of this class of materials. Here, we present a synergistic coordination and reticular chemistry approach to the design of a series of crystalline scandium-covalent organic frameworks (Sc-COFs), featuring tunable levels of metal incorporation.Removal of scandium from the material with the highest metal content results in a metal-imprinted COF (MICOF) that exhibits high a nity and capacity for Sc 3+ ions in acidic environments and in the presence of competing metal ions. In particular, the selectivity of this MICOF for Sc 3+ over common impurity ions such as La 3+ and Fe 3+ surpasses that of all reported scandium adsorbents. Importantly, analogous materials can be prepared starting from earth-abundant transition metals, highlighting the versatility of this approach for the development of tailor-made metal-COFs and MICOFs for applications involving selective metal ion capture.

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Synthesis, molecular weights and infrared spectra of some scandium(III) higher carboxylates

Cited by 6 publications

References 10 publications

Ammonia Capture via an Unconventional Reversible Guest-Induced Metal-Linker Bond Dynamics in a Highly Stable Metal–Organic Framework

Ammonia Capture via an Unconventional Reversible Guest-Induced Metal-Linker Bond Dynamics in a Highly Stable Metal–Organic Framework

Highly Selective and Portable Fluorescence Turn-On Detection of Sc³⁺ in Ore and Water Based on Strong Lewis Acid–Base Coordination

Selective scandium ion capture through coordination templating in a covalent organic framework

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Synthesis, molecular weights and infrared spectra of some scandium(III) higher carboxylates

Cited by 6 publications

References 10 publications

Ammonia Capture via an Unconventional Reversible Guest-Induced Metal-Linker Bond Dynamics in a Highly Stable Metal–Organic Framework

Ammonia Capture via an Unconventional Reversible Guest-Induced Metal-Linker Bond Dynamics in a Highly Stable Metal–Organic Framework

Highly Selective and Portable Fluorescence Turn-On Detection of Sc3+ in Ore and Water Based on Strong Lewis Acid–Base Coordination

Selective scandium ion capture through coordination templating in a covalent organic framework

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Highly Selective and Portable Fluorescence Turn-On Detection of Sc³⁺ in Ore and Water Based on Strong Lewis Acid–Base Coordination