Coordination Chem, Spectroscopic/Magnetic Properties

    Cards (20)

    • What is a coordination sphere?
      central metal plus the ligands coordination to it
    • What is the coordination number?
      number of donor atoms bonded to the central metal
    • What are the characteristics of coordination number 2:
      180 degrees, shape is linear
    • What are the characteristics of the coordination number 4:
      low oxidation number (0,+1) or d0/d10, 109.5 degrees = tetrahedral 90 degrees and d8 = square planner
    • What are the characteristics of coordination number 6:

      90 degrees, octahedral
    • For anionic (-) complexes, you replace the metal name with the stem/root with "ate" ending
    • What is crystal field theory?
      A theory that explains the splitting of d orbitals in a metal complex due to the presence of ligands.
    • Distance (energy) between the eg and the t2g is the octahedral spliting (delta o)
    • weak field ligands leads to smaller delta(o) splitting
    • Stronger field ligands lead to a large delta(o) splitting
    • What is a spectro-chemical series?
      Order of ligands based on their ability to split d-orbitals in a complex.
    • What is Hund's rule?
      Electrons fill orbitals of the same energy level one at a time before pairing up.
    • Tetrahedral complexes exhibit tetrahedral splitting (delta o)
    • Unpaired spins are paramagnetic (attracted to magnets)
    • All paired spins are called diamagnetic (slightly repelled by magnets)
    • Interaction strengths with magnet increases with the number of spins
    • High spins have small delta(o)
    • Low spins have large delta(o)
    • A high spin has more unpaired electrons than low spin
    • What's the Spectro series from weakest to strongest ligand
      I- < Br- < Cl- < OH- < F- < H2O < NH3 < en < CN- < CO
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