The syntheses, structural characterization, and magnetic behavior of five new 2D manganese(II) complexes with empirical formulas [Mn(N₃)₂(2,6-DiMepyz)(H₂O)]_n (1), [Mn(N₃)₂(Etpyz)(H₂O)]_n (2), [Mn(N₃)₂(H₂O)₂]_n(2,3-DiMepyz)_n (3), [Mn(N₃)₂(Clpyz)₂]_n (4), and [Mn(N₃)₂(Ipyz)₂]_n (5) (pyz = pyrazine (1,4-diazine)) are reported. 1 crystallizes in the monoclinic system, space group P2₁/c, with unit cell parameters a = 7.513(4) Å, b = 17.438(7) Å, c = 8.404(4) Å, β = 94.53(4)°, and Z = 4. 2 crystallizes in the triclinic system, space group P1̄, with unit cell parameters a = 7.386(2) Å, b = 8.434(2) Å, c = 9.442(3) Å, α = 71.82(2)°, β = 72.08(2)°, γ = 88.54(2)°, and Z = 2. 3 crystallizes in the monoclinic system, space group C2/c, with unit cell parameters a = 20.438(7) Å, b = 7.711(2) Å, c = 7.457(2) Å, β = 93.76(3)°, and Z = 4. 4 crystallizes in the orthorhombic system, space group Pbca, with unit cell parameters a = 8.600(2) Å, b = 13.440(4) Å, c = 24.083(7) Å, and Z = 8. 5 crystallizes in the orthorhombic system, space group Pbca, with unit cell parameters a = 8.521(2) Å, b = 13.787(3) Å, c = 26.237(5) Å, and Z = 8. The compounds 1 − 5 have only azido bridging ligands. In 1 − 3 each manganese atom is linked to the four nearest neighbors by only end-to-end azido bridges, forming square layers. 4 and 5 show alternating end-to-end and end-on azido bridges between manganese atoms. The magnetic properties of 1 − 5 are reported. At high temperatures the plots of χ_M or χ_MT vs T for the 1 − 3 compounds can be fitted as homogeneous 2D systems with J = −4.9, −4.4, and −3.9 cm^-¹ for 1−3, respectively. For 1, 3, and 5 magnetic ordering and spontaneous magnetizations is achieved below T_c = 35, 29, and 22 K, respectively, whereas 2 and 4 do not show spontaneous magnetization up to 2 K.

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