CARTESIAN AXIS AND PLANE CONVENTIONS IN Cnv SYMMETRY GROUPS

In this work, we call the attention to ambiguity found in literature when labeling vibrations and molecular orbitals as B1 B2 for molecules belonging C2v point group as, example, water molecule. A survey of several books some articles shows that comes from a long time ago persists today, being source misunderstanding waste students teachers. It means that, case groups Cnv, Dn, Dnh (n = 2, 4, 6), it is very important draw students’ exists literature. unfortunate recommendation made by Mulliken, more than sixty years ago, always place molecule yz plane, has not been followed.