Classical molecular dynamics is applied to the rotation of a dipolar molecular rotor mounted on a square grid and driven by rotating electric field E (ν) at T ≃ 150 K. The rotor is a complex of Re with two substituted o -phenanthrolines, one positively and one negatively charged, attached to an axial position of Rh \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \setlength{\oddsidemargin}{-69pt} \begin{equation*}{\mathrm{_{2}^{4+}}}\end{equation*} in a [2]staffanedicarboxylate grid through 2-(3-cyanobicyclo[1.1.1]pent-1-yl)malonic dialdehyde. Four regimes are characterized by a , the average lag per turn: ( i ) synchronous ( a < 1/ e ) at E (ν) = | E (ν)| > E _c (ν) [ E _c (ν) is the critical field strength], ( ii ) asynchronous (1/ e < a < 1) at E _c (ν) > E (ν) > E _bo (ν) > kT /μ, [ E _bo (ν) is the break-off field strength], ( iii ) random driven ( a ≃ 1) at E _bo (ν) > E (ν) > kT /μ, and ( iv ) random thermal ( a ≃ 1) at kT /μ > E (ν). A fifth regime, (v) strongly hindered, W > kT , Eμ , ( W is the rotational barrier), has not been examined. We find E _bo (ν)/kVcm ⁻¹ ≃ ( kT /μ)/kVcm ⁻¹ + 0.13(ν/GHz) ^1.9 and E _c (ν)/kVcm ⁻¹ ≃ (2.3 kT /μ)/kVcm ⁻¹ + 0.87(ν/GHz) ^1.6 . For ν > 40 GHz, the rotor behaves as a macroscopic body with a friction constant proportional to frequency, η/eVps ≃ 1.14 ν/THz, and for ν < 20 GHz, it exhibits a uniquely molecular behavior.