Lecture_4_20_09 - energy d orbital rather than pair up with...

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  1 Chapter 22:  The Transition Elements and  Coordination Compounds 
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2 Valence Bond Theory of  Complexes Valence bond theory  gave the earliest  theoretical description of the electronic  structure of a complex. According to this theory, a complex forms when double occupied ligand orbitals overlap unoccupied orbitals of the metal atom.
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3 Crystal Field Theory Crystal field theory  treats the ligands  as electric charge points that affect the  energy of the d orbitals of the metal ion. In an octahedral complex, two of the d orbitals have higher energy than the other three.
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4 Crystal Field Theory Crystal field theory  treats the ligands  as electric charge points that affect the  energy of the d orbitals of the metal ion. A high-spin complex forms when the pairing energy is greater than the crystal field splitting, so that electrons would “prefer” to occupy a higher-
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Unformatted text preview: energy d orbital rather than pair up with an electron in a lower-energy orbital. 5 Crystal Field Theory Crystal field theory treats the ligands as electric charge points that affect the energy of the d orbitals of the metal ion. When the pairing energy is smaller than the crystal field splitting, the d orbitals are occupied in the normal fashion, giving a low-spin complex. 6 Crystal Field Theory Crystal field theory treats the ligands as electric charge points that affect the energy of the d orbitals of the metal ion. The spectrochemical series is an arrangement of ligands according to the relative magnitudes of the crystal field splittings they induce. I-< Br-< Cl-< F-< OH-< H 2 O < NH 3 < en < NO 2-< CN-< CO weak-bonding ligands strong-bonding ligands Increasing...
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This note was uploaded on 02/26/2012 for the course CHEM 108 taught by Professor Dr.brennan during the Spring '09 term at Binghamton University.

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Lecture_4_20_09 - energy d orbital rather than pair up with...

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