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The complexes [M(MSH) 4 Cl 2 ] (MSH = CH 3 SO 2 NHNH 2 ; M = Mn (1), Fe (2), Co (3) and Ni (4)) were synthesized and characterized by elemental analysis, molar electric conductivity, IR and d-d electronic spectra. The X-ray single crystal analysis revealed for 3 (triclinic, P1̄ , a = 8.077(2), b = 8.622(2), c = 8.742(2) A° , α = 71.98(3), β = 75.30(3), γ = 64.11(3)°, V = 515.8(2)A° 3, Z = 1) and 4 (triclinic, P1̄ , a = 8.050(2), b = 8.588(2), c = 8.686(2) Å , α = 73.35(3), β = 75.76(3), γ = 63.94(3)°, V = 511.8(2) Å 3 , Z = 1) that MSH is coordinated via the amino N atom, the donor atoms and the metal are coplanar, and the Cl ligands are in trans-configuration. On the basis of IR data a similar structure is suggested for 1 and 2. The electronic spectra of 3 and 4 are interpreted by the Angular Overlap Model and bonding parameters are derived: e σ (N) = 3384(15), e σ (Cl) = 2788(25), e π (Cl) = 150(21) cm -1  for 3, and e σ (N) = 3668(21), e σ (Cl) = 2602(150), e π (Cl) = -21(128) cm -1  for 4.

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Manganese(II), Iron(II), Cobalt(II) and Nickel(II) Complexes of Methanesulfonic Acid Hydrazide. Crystal Structure of trans-Dichlorotetrakis(methanesulfonic Acid Hydrazide-N 2 )cobalt(II) and trans-Dichlorotetrakis(methanesulfonic Acid Hydrazide-N 2 )nickel(II)