Raman spectral characterization of silver metal-based complexes of different benzimidazolium ligands

Ali, Saqib; Riaz, Ayesha; Nawaz, Haq; Majeed, Muhammad Irfan; Iqbal, Muhammad Adnan; Bhatti, Haq Nawaz; Rashid, Nosheen; Kashif, Mohammad; Tahir, Muhammad; Nasir, Saira; Ullah, Saif; Farooq, Sidra; Naseem, Ammara

doi:10.1016/j.saa.2020.118162

Cited by 16 publications

(8 citation statements)

References 64 publications

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“…For each case, the Raman signal was attenuated at high potentials without any shift in the peak position (Fig. 4a ~ b), for example, the C-H out of plane bending benzimidazole in tPBA (769 cm -1 ), 47 and asymmetric stretches of the carboxylate anion (COO -) in BTC (1591 cm -1 ). 48 The result indicates that Ni-tPBA 3 differs from the traditional CCs undergoing drastic ligand dissolution/decomposition and reconstruction, attributed to the robust binding of the nickel center to the ligand molecules with high stability.…”

Section: Resultsmentioning

confidence: 98%

Identifying and tuning coordinated water molecules for efficient electrocatalytic water oxidation

Zhang,

Guo

et al. 2024

Preprint

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Coordination complexes are promising candidates for powerful electrocatalytic oxygen evolution reaction (OER) but challenges remain in favoring the kinetics behaviors through local coordination regulation. Herein, by refining the synergy of carboxylate anions and multiconjugated tripodal benzimidazole ligands, we tailor a series of well-defined and stable coordination complexes (CCs), Ni-tPBA0~3, with three-dimensional (3D) supramolecular/coordinated structures. The coordinated water as potential open coordination sites (OCSs) can directly become intermediates, while the metal center easily achieves re-coordination with water molecules in the pores to resist lattice oxygen dissolution. Specifically, nickel centers with mono-coordinated water undergo the intermolecular oxygen coupling while those with neighboring coordinated water molecules follow an intramolecular oxygen coupling mechanism (IOM) with a low thermodynamic energy barrier. With more coordinated water introduced, an optimized IOM process appears with the synergy of potential OCSs, enabling fast generation of –Ni–(OH)x intermediate and synchronizing the re-coordination of water molecules with the deprotonation of active –OH for enhanced kinetics. As such, a low overpotential of 265 mV at 10 mA cm–2 and long-term stability of 150 h at 100 mA cm–2 was achieved, superior to most single transition metal-based molecular electrocatalysts. This study underscores the potential of crafting the coordinated water molecules for efficient electrocatalysis applications.

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Section: Resultsmentioning

confidence: 98%

Identifying and tuning coordinated water molecules for efficient electrocatalytic water oxidation

Zhang,

Guo

et al. 2024

Preprint

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“…Using the Raman spectra, the presence of chemical bonds in the prepared composite is shown in Figure B. The peaks at 243, 779, 1011, 1263, and 1360 cm –1 were attributed to the C–C–C out of plane bending, C–H out of plane bending, C–C–C trigonal bending, C–H in plane bending, and C–N stretching vibrations of the benzimidazole organic framework, respectively. , The sharp peak at 307 cm –1 may be attributed to the Co–N vibration, which suggests the presence of cobalt in ZIF-12 . In Pec, the peaks around 330, 441, 853, and 1700 cm –1 correspond to the dominant bands, α-glycosidic bonds, and CO stretching vibration of the ester carbonyl group. , The composite Pec@ZIF-12 exhibits a high intense peak around 680 cm –1 , while the other peaks of ZIF-12 have less intensity, thereby strongly suggesting the interaction of both materials.…”

Section: Resultsmentioning

confidence: 99%

“…The peaks at 243, 779, 1011, 1263, and 1360 cm −1 were attributed to the C−C−C out of plane bending, C−H out of plane bending, C−C−C trigonal bending, C−H in plane bending, and C−N stretching vibrations of the benzimidazole organic framework, respectively. 42,43 The sharp peak at 307 cm −1 may be attributed to the Co−N vibration, which suggests the presence of cobalt in ZIF-12. 44 In Pec, the peaks around 330, 441, 853, and 1700 cm −1 correspond to the dominant bands, α-glycosidic bonds, and C� O stretching vibration of the ester carbonyl group.…”

Section: Resultsmentioning

confidence: 99%

Natural Polymer Encapsulated Zeolitic Imidazolate Framework-12 Composite toward Electrochemical Sensing of Antitumor Agent

Thenrajan,

Madhu Malar,

Wilson

2024

ACS Appl. Bio Mater.

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Encapsulation of natural polymer pectin (Pec) into a zeolitic imidazolate framework-12 (ZIF-12) matrix via a simple chemical method toward anticancer agent gallic acid (GA) detection is reported in this work. GA, a natural phenol found in many food sources, has gained attention by its biological effects on the human body, such as an antioxidant and anti-inflammatory. Therefore, it is crucial to accurately and rapidly determine the GA level in humans. The encapsulation of Pec inside the ZIF-12 has been successfully confirmed from the physiochemical studies such as XRD, Raman, FTIR, and XPS spectroscopy along with morphological FESEM, BET, and HRTEM characterization. Under optimized conditions, the Pec@ZIF-12 composite exhibits wide linear range of 20 nM−250 μM with a detection limit of 2.2 nM; also, it showed excellent selectivity, stability, and reproducibility. Furthermore, the real sample analysis of food samples including tea, coffee, grape, and pomegranate samples shows exceptional recovery percentage in an unspiked manner. So far, there is little literature for encapsulating proteins, enzymes, metals, etc., that have been reported; here, we successfully encapsulated a natural polymer Pec inside the ZIF-12 cage. This encapsulation significantly enhanced the composite electrochemical performance, which could be seen from the overall results. All of these strongly suggest that the proposed Pec@ZIF-12 composite could be used for miniaturized device fabrication for the evaluation of GA in both home and industrial applications.

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“…The Raman spectrum of 1 (Figure S4) contained peaks at 504 and 1227 cm −1 that were attributed to the C−N bending and stretching vibrations of the NHC group, while that at 1300 cm −1 could be assigned to the C− Au−C and N−C−N stretching vibrations. 47,59 The positive electrospray ionization mass spectra (ESI-MS) of 1 in MeOH Photophysical Properties of 1. The photoluminescent responses of compound 1 in the solid state and in the MeOH solution were recorded at ambient temperature.…”

Section: ■ Introductionmentioning

confidence: 99%

Aggregation-Induced Emission Phosphorescence Featured Au–Ag Coordination Polymer with a Diphosphine N-Heterocyclic Carbene Ligand for Highly Sensitive Detection of Cr(VI)

Yan,

Hu,

Cui

et al. 2024

Inorg. Chem.

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Luminescent materials with aggregation-induced emission (AIE) characteristics have been recognized as highly selective and sensitive probes for the detection of toxic metal ions in recent years. In this paper, a Au−Ag cluster-based coordination polymerwas prepared by in situ generation of the diphosphine N-heterocyclic carbene (PC NHC P)-type ligand L in the presence of the corresponding metal salts. Compound 1 exhibited 530 nm phosphorescence under 380 nm excitation with a QY of 6.30% and a lifetime (τ) of 7.14 μs in the solid state. 1 showed good AIE behavior in the mixture of MeOH/H 2 O while the best aggregation state (f water = 90%, QY = 6.79%, τ = 6.70 μs) exhibited selective and sensitive emission quenching toward Cr(VI) ions. Ultralow detection limits of 9.7 ppb (w/ w) for Cr 2 O 7 2− and 17.9 ppb (w/w) for CrO 4 2− were achieved.

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Raman spectral characterization of silver metal-based complexes of different benzimidazolium ligands

Cited by 16 publications

References 64 publications

Identifying and tuning coordinated water molecules for efficient electrocatalytic water oxidation

Identifying and tuning coordinated water molecules for efficient electrocatalytic water oxidation

Natural Polymer Encapsulated Zeolitic Imidazolate Framework-12 Composite toward Electrochemical Sensing of Antitumor Agent

Aggregation-Induced Emission Phosphorescence Featured Au–Ag Coordination Polymer with a Diphosphine N-Heterocyclic Carbene Ligand for Highly Sensitive Detection of Cr(VI)

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