Question

Divide the following 4 molecules among group members: carbon monoxide, water, dinitrogen oxide, and bitrate ion. Does the molecule have a permanent dipole moment? Examine the vibrational modes for the molecule on the Chemical Education Digital Library website. Is there a change in the dipole moment when the molecule undergoes a vibrational motion? Will a vibrational mode result in an IR active absorption? Answer these questions in appropriate table below and share answers among group members. co CO Molecule Permanent Dipole? Vibrations (frequency) Change in Dipole IR Active? HO Molecule Permanent Dipole? Vibrations (frequency) Change in Dipole IR Active? NO Molecule Permanent Dipole? Vibrations (frequency) Change in Dipole IR Active? NO Molecule Permanent Dipole? Vibrations (frequency) Change in Dipole IR Active?

Answer 1

the molecules which show change in dipole moment during vibratory motion are I.R active. only those vibrations will show peak absorption in IR spectrum which lead to change in dipole moment.

MOLECULE Co Cor point group Permanent Dipole: yes czo 0.0599 Debye SG 2208.632 vibration frequency change in dipole: yes CEO stretching O IR active : yes - Molecule 420 CAV point group Permanent Dipole yes 2.0967 Debye uibration frequency A 1713.182 A1 3729.281 B2 3850-656 + change in dipole yes Yes IR Active yo yes . دعلا

NENO coor point group N₂0 Molecule Permanent Dipole : yes 0.0161 Debye P1 604.472 PZ 604.472 SG 1343-855 SG 2312.05 vibration frequency NENO ENEN NEN- O- NEN-0- yes change in defole 1 yes ye IR yes Active yo - yes yes group Molecule NOš ono Permanent Dipole : No D3h point (osebye) racon E' 706.26 E' 706-27 A2" 837.4 Al" 1076.57 E'1469.716 E' 1469.739 frequency No No yo yes change in dipole NO No No Vs ye yes IR Active