Optical and vibrational properties of nickel integrated germanium Zintl ion clusters

Date

2019-05-01

Author

Ogun, Esra
Esentürk, Okan
Nalbant Esentürk, Emren

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

185
views

0
downloads

Vibrational and optical properties of Ni-Ge clusters ([Ni2Ge9(PPh3)](2-), [Ni6Ge13(CO)(5)](4-)) have been investigated via UV-Vis, FTIR, and Fluorescence spectroscopies. Moreover, frequency and time-dependent (TD) electronic transition calculations have been performed to better characterize experimental findings, due to the scarcity of vibrational and optical spectroscopic studies on these type of clusters in the literature. UV-Vis spectroscopic analyses demonstrate a broad absorption band, with a maximum at 270 nm for both Ni-Ge clusters. [Ni6Ge13(CO)(5)](4-) cluster band is broader and has a shoulder around 320 nm. Vibrational modes associated with the clusters appear at low-frequency region of FTIR spectra. [Ni6Ge13(CO)(5)](4-) cluster spectrum is very rich as expected due to higher number of atoms in the cluster structure. Main vibrational modes of [Ni2Ge9(PPh3)](2-) are observed at 318(m) cm(-1) and 130(w) cm(-1), and those of [Ni6Ge13(CO)(5)](4-) appear at 232(s) cm(-1) and 155(s) cm(-1). Similarities observed between simulated and experimental spectra strongly support a stable, isolated cluster behavior in the crystal structure. Fluorescence spectroscopic analysis demonstrates that excitation of [Ni2Ge9(PPh3)(2-) and [Ni6Ge13(CO)(5)](4-) clusters at 260 nm has resulted relatively strong and broad emissions at 400 nm and 410 nm, respectively. [Ni2Ge9(PPh3)](2-) and [Ni6Ge13(CO)(5)](4-) clusters are two of the very few examples of Zintl ion clusters that have been characterized with UV-Vis and FTIR spectroscopic analyses, and the only ones that have been studied with fluorescence spectroscopy.

Subject Keywords

Physical and Theoretical Chemistry, Inorganic Chemistry, Materials Chemistry

URI

https://hdl.handle.net/11511/42325

Journal

INORGANICA CHIMICA ACTA

DOI

https://doi.org/10.1016/j.ica.2019.02.041

Collections

Department of Chemistry, Article

Suggestions

OpenMETU
Core

Optical and Vibrational Properties of [Pt@Pb-12](2-), [Ni@Pb-12](2-), and [Ni@Pb-10](2-) Zintl Ion Clusters Çetin, Asude; Esentürk, Okan; Nalbant Esentürk, Emren (Wiley, 2017-05-10) The optical and vibrational properties of Pt- and Ni-centered Pb-Zintl-ion clusters have been investigated by UV/Vis and FTIR spectroscopy. Computational studies have been performed to better interpret the experimental data, due to a lack of any FTIR and UV/Vis spectroscopic studies on these clusters or similar ones in the literature. UV/Vis spectroscopic analyses show an asymmetric broad absorption band, with a maximum at 265 nm for both Pt- and Ni-centered Pb clusters. FTIR spectroscopic analysis demonstr...
Optical properties of Meloxicam in the far-infrared spectral region Aytekin, Yusuf Samet; Zaczek, Adam; Korter, Timothy M.; Heilweil, Edwin J.; Esentürk, Okan (Elsevier BV, 2018-08-17) One of the most commonly used nonsteroidal anti-inflammatory active pharmaceutical ingredient called Meloxicam has been characterized spectroscopically both by Terahertz (THz) time domain spectroscopy (THz-TDS) and by Fourier Transform Infrared (FTIR) spectroscopy in far-IR regions of electromagnetic spectrum; 0.2 THz-20 THz. While many relatively sharp features are observed in the far-IR range between 2 THz-20 THz as expected for being an organic substance, very distinct and relatively strong absorption ba...
Concise synthesis, electrochemistry and spectroelectrochemistry of phthalocyanines having triazole functionality KARACA, Huseyin; SEZER, Serdar; Ozalp-Yaman, Seniz; Tanyeli, Cihangir (Elsevier BV, 2014-04-10) The synthesis of novel metallophthalocyanines (M = Zn, Ni) bearing substituted benzyl protected 1,2,3-triazole moieties at peripheral positions is described for the first time via direct cyclotetramerization. These complexes have been characterized by a combination of FT-IR, H-1 NMR, HRMS and UVVis spectroscopy techniques and all the new compounds are highly soluble in most common organic solvents. In addition, the electrochemical and electrochromic behaviors of the complexes are investigated. Cyclic voltam...
Nonlinear effects in proline-thiourea host-guest complex catalyzed aldol reactions in nonpolar solvents Demir, Ayhan Sıtkı; Eymur, Serkan (Elsevier BV, 2010-03-16) An aldol reaction catalyzed by a proline-thiourea host-guest complex in a nonpolar solvent shows excellent nonlinear effects. This proline-thiourea system has the ability to form a hydrogen-bonding network. The enantiomeric excess of proline in a solution can be significantly enhanced by its incorporation with a urea molecule into its solid racemate. This suggests a general and facile route to homochirality, which may be involved in the origin of chirality on earth.
ELECTRONIC-STRUCTURE AND SPECTRA FOR SQUARE COMPLEXES CONTAINING SULFUR-DONOR LIGANDS - M(DTO)2(2+) (M = PT(II), PD(II) - DTO = 3,6-DITHIAOCTANE), M(SCN)4(2-) (M = PT(II), PD(II), AND M(ET-XAN)(2) (M = PT(II), PD(II), NI(II) - ET-XAN- = C2H5OCS2-) ISCI, HY; DAG, O; MASON, WR (American Chemical Society (ACS), 1993-09-01) Electronic absorption and magnetic circular dichroism (MCD) spectra in the UV visible region are reported for acetonitrile-solutions of [M(dto)2](ClO4)2, dto=3,6-dithiaoctane, M=Pt(II) and Pd(II); [(n-C4H9)4N]2[M(SCN)4], M = Pt(II) and Pd(II); and M(Et-Xan)2, Et-Xan =ethylxanthate, M=Pt(II), Pd(II), and Ni(II). The intense bands and the MCD B terms observed for the Pd(II) and Ni(II) complexes are generally assigned to ligand to metal charge transfer (LMCT) from orbitals of the S donor to the empty metal dsi...

Citation Formats

E. Ogun, O. Esentürk, and E. Nalbant Esentürk, “Optical and vibrational properties of nickel integrated germanium Zintl ion clusters,” INORGANICA CHIMICA ACTA, pp. 16–23, 2019, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/42325.