One of the more striking hydride complexes is enneahye tricapped trigonal-pyramidal geometry. What is the point group of this ion? Construct a representation using the hydrogen orbitals as a basis. Reduce this to its component irreducible representations, and determine which orbitals of Re are of suitable symmetry to interact with the hydrogen group orbitals.
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- What is the name of the following coordination complexes and state their point groups. (Justify your answer)One of the more striking hydride complexes is [ReH9]2-, which has tricapped trigonal prismatic geometry. Construct a representation using the hydrogen orbitals as a basis. Reduce this to its component irreducible representations, and indicate which orbitals of Re are of suitable symmetry to interact with the hydrogen orbitals.2. Draw the MO diagram for the hypothetical square planar PtH42- ion. Consider only the s-interactions. Label all orbitals with the appropriate symmetry label. Include the 5d, 6s, and 6p orbitals on the metal. Plot roughly to scale. What is the point group? Use the following SALCs for the H 1s orbitals:
- Find the point groups of all the possible geometrical isomers for the complex MA2B2C2 in which there is ‘octahedral’ coordination around the central atom M and where the ligands A, B, and C are treated as structureless points. Which of the isomers are chiral?Work out the stoichiometries and structures of the neutral complexes, chromium carbonyl, rhenium carbonyl, and nickel carbonyl using the 18-electron rule. Then use valence bond theory to determine the hybridizations of the orbitals in each complex?The two egorbitals are identical in energy in an octahedralcomplex but have different energies in a square planar complex,with the dz2orbital being much lower in energy than the dx2-y2 .Explain with orbital sketches.
- CFT is applicable to molecules in geometries other than octahedral. In octahedral complexes, remember that the lobes of the eg set point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place,but now we have only four ligands located between the axes (as given). None of the orbitals points directly at the tetrahedral ligands. However, the eg set (along the Cartesian axes) overlaps with the ligands less than does the t2g set. By analogy with the octahedral case, predict the energy diagram for the d orbitals in a tetrahedral crystal field. To avoid confusion, the octahedral eg set becomes a tetrahedral e set, and the octahedral t2g set becomes a t2 set.Tetrahedral complexes such as [FeF4]2- possess a Td symmetry, as indicated in the picture below. Use group theory and symmetry operations to determine the reducible representation resulting from the combination of y vectors. Break the reducible into irreducible and decide which metal orbitals are likely used to form σ bonds.Please provide the POINT GROUPS of the following objects and explain why.
- Determine the symmetry point groups of the mer- and fac- isomers of the complex [Re(CO)3(NCMe)3] and deduce the irreducible symmetry representations generated by the three stretching vibrations of the C triple bond to N ligands in each of the isomers. [Regard NCMe as a linear ligand.] Also for each isomer discussed, state with reasoning which vibrations are IR active, and which are Raman active and how many bands will be observable in IR and Raman spectra. How can you distinguish the two isomers using their vibrational spectra?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.What are the number of classes and the order of the following point groups? a C2v b D2h c D6h d S4 e Cs.