8.39 How many possible isomers are there of the ion IO2F3²¯? Sketch these, and indicate the point group for each. The observed ion has IR-active iodine-oxygen stretches at 802 and 834 cm-1. What does this indicate about the most likely structure? (See J. P. Mack, J. A. Boatz, M. Gerken, Inorg. Chem., 2008, 47, 3243.
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- Structural isomers can have very different point groups. There are three isomers of dichlorobenzene. Identify the point groups of the three isomers.Determine the point groups of the following molecules. a Fe(CO)5, which has a trigonal bipyramidal structure, b CO32, which has three resonance structures that contribute to its overall shape, c The perfectly staggered conformation of ethane, d The perfectly eclipsed conformer of ethane.Structural isomers can have very different point groups. Determine the point groups of 1,4cyclohexadiene and 1,3cyclohexadiene, which both have the molecular formula C6H8.
- 4.30 The structure of 1,1,2,2-tetraiododisilane is shown here. (Reference: T. H. Johansen, K. Hassler, G. Tekautz, K. Hagen, J. Mol. Struct., 2001, 598, 171.) H I- Si -Si I H a. What is the point group of this molecule? b. Predict the number of IR-active Si-I stretching vibrations. c. Predict the number of Raman-active Si-I stretching vibrations.To what point group does the square - pyramidal ion [NI(CN)s] belong? Select one: A. C5v B. D5h С. СAV D. Dad E. D4h8.21 1,2-Diiododisilane has been observed in both anti and gauche conformations. (See K. Hassler, W. Koell, K. Schenzel, J. Mol. Struct., 1995, 348, 353.) For the anti con- formation, shown here, I H H Si-Si H H a. What is the point group? b. Predict the number of infrared-active silicon-hydrogen stretching vibrations.
- The staggered ethane molecule C,Hg has D3d symmetry a. Derive the reducible representation G for the ligand group orbitals (LGO) of H. b. Which irreducible representations can produce the O derived in part a c. Derive the LGO's and draw them.Ims.uop.ed Which of the following point groups would make a molecule to be polar? Select one: O D4h O C3v OTa The "group-theoretical" criterion of chirality in a molecule is: Select one:Assign the point group of the following coordination compounds: a) Cl. b) d) CI-Hg-Hg-ci 3- 2- 2+ ÇN NH3 H3N., Co* 'NH3 NH3 g) NC-Ni..iCN CN ČN h) Cu.."Br e) f) H3N Br Br CO j) H3N-Ag-NH3 i) OC-FeNO ON CO
- ( A 19. Find the point groups of the following molecules: Bri Br CI G W CI Br Br B Br.... Br CI Br F CI Br C Br... Br Br W CI CI CI D Brassymetric CI Cli Chu..... Br W Br CISquare planar Ir complexes have been widely studied in organometallic catalysis. Provided the following isomers answer the following questions: CN CN .... CI CN NC CI Isomer A Isomer B What is the point group of each isomer? C2v D2h Isomer A: Isomer B: а. Determine the reducible and irreducible representations corresponding to the CN stretching of Isomer A. b. Determine the reducible and irreducible representations corresponding to the CN stretching of Isomer B. With the information learned, can these 2 isomers be distinguished with IR spectroscopy? с.State the point group for the following compounds. Explain your answe. (i) Trans-tetrakarbonildikloromangan(II). Trans-tetracarbonyldichloromanganese(). (ii) Tetrakloronikelat(1). Tetrachloronickelate(1I)