Comparative Crystal Field Studies of Some Ligand of Cr3+ Complexes
DOI:
https://doi.org/10.23918/eajse.v3i1sip109Keywords:
Crystal Field Theory, Ligand, Cr+3, UV-Visible Spectrum, Tanabe-Sugano DiagramsAbstract
Chromium (III) complexes of nominate ligands are well recognized for their biological significance along with their anti-carcinogenic, anti-bacterial, and anti-fungal properties. In this investigation a range of Cr+3 complexes with diverse ligands were examined; and categorized with ultraviolet-visible, UV-Vis, spectrometer. Crystal field theory is an electrostatic method, utilized to characterize the fragmentation in d-orbital metal energies. It offers an expected explanation of the electronic energy levels that control the UV-Vis spectra. Accordingly, complexes’ crystal field splitting parameters (Δo) are measured through the transition-band using the maximum wavelength. Similarly an additional method, comprising Tanabe-Sugano (TS) diagrams, has been utilized to compute crystal field splitting parameters for assessment. Thus, good agreement was found between both techniques. The configuration of the ligands in increasing order is found to be (H2O) Cl < urea < H2O < OX < NCS < OX H2O < acac < en Cl < NH3 NCS < en which coordinate mostly with the spectro-chemical series. Therefore (H2O) Cl is the weakest ligand, while ethylenediamine (en) is the strongest one among the investigated ligands of Cr3+ complexes. Clearly strong ligands such as; ethylenediamine is considerably influences the coordination geometry of the metal complexes which effect on the deposit morphology and other physical and chemical properties.
References
Atkins, P. (2010). Shriver and Atkins’ Inorganic Chemistry: OUP Oxford.
Bersuker, I. B. (2010). Electronic Structure and Properties of Transition Metal Compounds:
Introduction to the Theory: Wiley.
Burger, K., Belcher, R., & Freiser, H. (2013). Organic Reagents in Metal Analysis: International
Series of Monographs in Analytical Chemistry: Elsevier Science.
Drickamer, H. G., & Frank, C. W. (2013). Electronic Transitions and the High Pressure Chemistry
and Physics of Solids: Springer Netherlands.
Neuss, G. (2001). Chemistry for the IB Diploma: Oxford University Press.
Newman, D. J., & Ng, B. (2007). Crystal Field Handbook: Cambridge University Press.
Öztürk, Ö. F., Zümreoglu‐Karan, B., & Can, M. M. (2008). Synthetic, Structural and Magnetic
Studies on Chromium Orthoborate. Zeitschrift für anorganische und allgemeine Chemie,
634(6‐7), 1127-1132.
Pavia, D., Lampman, G., Kriz, G., & Vyvyan, J. (2008). Introduction to spectroscopy: Cengage
Learning.
Racah, G. (1942). Theory of complex spectra. II. Physical Review, 62(9-10), 438.
Reddy, S. L., Reddy, G. S., & Endo, T. (2012). Electronic (Absorption) Spectra of 3d Transition
Metal Complexes: INTECH Open Access Publisher.
Sharpe, A. G. (1976). The Chemistry of Cyano Complexes of the Transition Metals: Academic Press.
Sugano, S., Tanabe, Y., & Kamimura, H. (1970). Multiplets of Transition-Metal Ions in Crystals,
Acad. Press, New York.
Tanabe, Y., & Sugano, S. (1954a). On the absorption spectra of complex ions II. Journal of the
Physical Society of Japan, 9(5), 766-779.
Tanabe, Y., & Sugano, S. (1954b). On the absorption spectra of complex ions. I. Journal of the
Physical Society of Japan, 9(5), 753-766.
Van den Heuvel, W., Hendrickx, M. F., & Ceulemans, A. (2007). A CASPT2 study of the electronic
spectrum of hexacyanoosmate (III). Inorganic chemistry, 46(19), 8032-8037.
Weller, M., Overton, T., Rourke, J., & Armstrong, F. (2014). Inorganic Chemistry: OUP Oxford.
Winter, M. J. (2015). D-block Chemistry: Oxford University Press.
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