Magnetization measurements reveal that dominant antiferromagnetic interactions are mediated between the manganese(II) centers for both structures through oxovanadate bridges. Magnetic data of compound 1 were fitted with the analytical expression for a regular chain model, estimating a J value of 鈭?.30 cm^鈭?. The DAVE code was use to fit experimental data and calculate the values of the super exchange constants for 2, assuming four different exchange pathways, J₁₂ = 鈭?.17 cm^鈭?; J₂₃ = 鈭?.12 cm^鈭?; J₁₃ = 鈭?.08 cm^鈭?; J₂₄ = 鈭?.05 cm^鈭?. DFT calculations on a tetranuclear fragment of 2, using diamagnetic substitutions, gave super exchange values of J₁₂ = 鈭?7.5 cm^鈭? and J₂₃ = 鈭?.5 cm^鈭?, corroborating the antiferromagnetic nature of the interactions as observed experimentally.