The OH bond stretching mode is sensitive to the specific coordination environment in which the molecule resides. Three-coordinated water molecules have a wide and flat absorption at 3000-3600 cm -1 , while the four-coordinated water molecules absorb the IR signal at 3200-3500 cm -1 . Lastly, the free OH frequency corresponds to 3700 cm -1 . As a result, the inhomogeneous hydrogen bond environment in water broadens the OH stretching mode covering a range of 3000 cm -1 to 3700 cm -1 . Therefore, the distinction in band broadening between the SPC/Fw and DPMD models holds significant importance. This disparity serves as evidence indicating whether the molecules within the model can effectively adapt to varied coordination environments.