Similarity Transform A, B and X are elements of a group, if BEX-1AX We say B is conjugate with A Class-A complete set ofelements which are conjugate to one another 20218/21 Chemistry Departme nt of Fudan University
Physical ChemistryI Chemistry Department of Fudan University Chapter IV Molecular Symmetry and Point Group 2021/8/21 26 A, B and X are elements of a group, if B=X-1AX We say B is conjugate with A. Similarity Transform Class---A complete set of elements which are conjugate to one another
84-2-2. Molecular Point Groups Point group-----All symmetry elements in a molecule intersect at a common point which is not shifted by any of the symmetry operations Schoenflies symbols 20218/21 Chemistry Departme nt of Fudan University
Physical ChemistryI Chemistry Department of Fudan University Chapter IV Molecular Symmetry and Point Group 2021/8/21 27 §4-2-2. Molecular Point Groups Point group-----All symmetry elements in a molecule intersect at a common point, which is not shifted by any of the symmetry operations. Schoenflies Symbols
1. Cn groups---only one Cn Axis n Cn symmetry operations, g=n F CFCIBrl 20218/21 Chemistry Departme nt of Fudan University
Physical ChemistryI Chemistry Department of Fudan University Chapter IV Molecular Symmetry and Point Group 2021/8/21 28 1. Cn groups---only one Cn Axis n Cn symmetry operations, g=n Br I F Cl C1 CFClBrI
C2(E,C2) 2 C-I-C Fe 20218/21 Chemistry Departme nt of Fudan University
Physical ChemistryI Chemistry Department of Fudan University Chapter IV Molecular Symmetry and Point Group 2021/8/21 29 Cl Fe Cl C2 (E, C2 ) U O O C C C2
3,(E,C3,C32) Cl C2H3Cl3 20218/21 Chemistry Departme nt of Fudan University
Physical ChemistryI Chemistry Department of Fudan University Chapter IV Molecular Symmetry and Point Group 2021/8/21 30 C3 , (E, C3 , C3 2 ) O O O C3 C3 C2H3Cl3 H Cl H H Cl Cl