Frequencies (cm⁻¹)

Experimental

DFT Calculation (present study)

${\nu }_{\text{anyisym}}$

^a1515

1526, 1525 (^b1510 - 1527)

${\nu }_{\text{sym}}$

^a1455

1494 (^b1452 - 1464)

$\Delta {\nu }_{a-s}$

~60

~32 (~^b60)