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Metal clusters are present in biocatalysts, enzymes. Explain briefly.
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- 1.What are the dominant energy terms that are responsible for cesium fluoride occurring as an ionic solid and hydrogen fluoride occurring as a diatomic gas at standard conditions? 2.Explain why the energy separation between the t2g and eg d molecular orbitals in Mo(OCH3)6 is smaller than the value for Mo(CO)6 even though the average Mo-OCH3 bond dissociation enthalpy is more than twice the M-COWhile d-electrons in many transition metal compounds may not be involved directly in bond formation, they nevertheless exert a considerable influence on structure. Explain.1. Below is a molecular orbital diagram for a generic metallocene. Based on this, contrast the metal carbon bond lengths in chromocene [Cr(CsHs)2], ferrocene [Fe(CsHs)2] and nickelocene [Ni(CsHs)2]. Which would you expect to be a reductant, which is an oxidant and which is stable? Justify your answer. M MCP 2 Cp equ ezg 4p azu ezgi ezu azu etu ezu 45 aig 3d alg eig 20 equ 19 ezg 19 1gazu
- why crystal structure is important at coordination chemistry3. Please provide a justification for the following statement: lithium chloride dissolves in polar organic solvents. What would you expect for other group I metal halides?In CrBr2, which crystallizes with a distorted CdI2 structure, four Cr-Br distances are 254 pm and two are 300 pm. Explain the origin of the different Cr-Br bond lengths in this extended ionic or network covalent solid.
- “Mango-globin” is a hemoglobin variant in which the iron atoms in each subunit have been substituted with manganese atoms. Mango-globin binds to oxygen at very high partial pressures, but does not exhibit any cooperativity. Propose an explanation for this observation. (Hint: the ionic radius of Fe2+ is 77 pm; the ionic radius of Mn2+ is 82 pm.) The free energy change for a chemical reaction is defined as follows: ∆?!= ∆? ̊!+ RT ln [products] / [reactants] When a reaction is at equilibrium, ∆G’ = 0, and this expression simplifies to: ∆? ̊!= −RT ln [products] / [reactants] At equilibrium, the ratio of product to reactant concentrations is nothing more than the equilibrium constant, Keq, for the reaction. Under these conditions: ∆G ̊’ = -RT ln KeqWhich would have a higher CO stretching frequency, Cr(CO)6 or V(CO)6–? Explain why in detail using molecular orbital arguments.Calculate the energy for vacancy formation in silver, given that the equilibriumnumber of vacancies at 800°C is 3.6x1023 m-3 . The atomic weight and density(at 800°C) for silver are, respectively, 107.9 g/mol and 9.5 g/cm3. (NA= 6.023x1023 atoms/mol)
- Give the electron configuration and the number of unpaired electrons for (a) Sc3+; (b) Cu2+; (c) Fe3+; (d) Nb3+.Using Wade's rules, derive the structure of a hypothetical heteroborane with the molecular formula B3Si2GaH5MeEt2. What kind of borane is this? What is the 3D geometry.Give the number of delectrons (nof dn) for the centralmetal ion in (a) [TiCl6]2-; (b) K[AuCl4]; (c) [RhCl6]3-