A Structural and Vibrational Study of the Chromyl by Silvia A. Brandán

By Silvia A. Brandán

A Structural and Vibrational research of the Chromyl Chlorosulfate, Fluorosulfate and Nitrate Compounds provides vital experiences regarding the structural and vibrational homes at the chromyl compounds according to Ab-initio calculations. The synthesis and the examine of such homes are of chemical significance as the stereo-chemistries and reactivities of those compounds are strongly depending on the coordination modes that undertake different ligands associated with the chromyl workforce.
In this ebook, the geometries of all good constructions in gasoline part for chromyl chlorosulfate, fluorosulfate, and nitrate are optimized by utilizing Density practical idea (DFT). Then, the total assignments of all saw bands within the infrared and Raman spectra are played combining DFT calculations with Pulay´s Scaled Quantum Mechanics strength box (SQMFF) technique and considering the kind of coordination followed via the chlorosulfate, fluorosulfate and nitrate ligands as monodentate and bidentate. furthermore, the strength constants for every compound on the similar degrees of thought are calculated. therefore, the bond orders calculated and the topological homes of digital cost density display the features and nature of different bonds in each one structure.

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Extra info for A Structural and Vibrational Study of the Chromyl Chlorosulfate, Fluorosulfate, and Nitrate Compounds

Example text

A. L. Roldan, C. Socolsky, A. Ben Altabef, 1027-1043, Copyright 2008, with permission from Elsevier S. A. 1007/978-94-007-5763-9_3, Ó The Author(s) 2013 45 46 3 Structural and Vibrational Study of Chromyl Nitrate mode of coordination adopted by nitrate groups and the stereochemistry of this compound are important in relation to the vibrational properties and chemical reactivity [7–9]. The chromyl nitrate, CrO2(NO3)2, compound presents vibrational properties imperfectly described and only the main characteristics of the infrared (IR) spectrum were published in the liquid phase [10] and in previous studies we have assigned some bands observed in the vibrational spectra of the chromyl nitrate [1].

B). 8). One important observation is that the CrO2 bending (O=Cr=O) mode appears at the same wavenumbers that in the monodentate case. 11 Experimental and calculated frequencies (cm-1), potential energy distribution and assignment for C2(1) Structure of chromyl fluorosulfate C2(1) Structure bidentate coordination Modes Observeda Calculatedb SQMc PED (C10 %) A symmetry 1 1329 s 2 1178 sh 3 1055 sh 4 1026 s 5 794 m 6 666 sh 7 580 sh 8 534 w 9 476 sh 1387 1127 1109 931 826 657 557 556 478 1394 1179 1010 961 850 679 562 509 475 10 11 12 436 347 270 445 341 274 13 14 15 16 235 155 143 98 220 148 136 93 17 B symmetry 18 1233 sh 19 1209 vs 20 1026 s 21 989 sh 22 871 w 23 734 m 24 611 sh 57 56 1374 1149 1091 895 826 657 557 1379 1191 979 946 853 684 578 25 26 506 449 506 462 361 355 336 257 214 132 75 10 334 240 204 128 74 10 514 w 450d 27 28 29 30 31 32 33 a b c d 330d ms S=O (51) ?

This leads to the conclusion that any analysis based on the Mulliken atomic charges must be made with care as it is apparent that a satisfactory explanation based on electronegativity criteria is not affordable [3]. A somewhat different but related explanation might be tried on the basis of the delocalized and/or bonding characters of the relevant molecular orbitals (MO), as observed in the series of the VO2X2- anions [3]. After a careful inspection of the atomic orbital coefficients (AO) appearing in the different MO it is possible to note 1 1.

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