Two new iron(II) compounds with the formula [Fe-3(iptrz)(6)(H2O)(6)]X-6 . xH(2)O (with iptrz = 4-isopropyl-1,2,4-triazole and X = p-toluenesulfonate (Tos) or trifluoromethanesulfonate (Trifl)) were synthesized. The crystal structure of [Fe-3(iptrz)(6)(H2O)(6)](Tos)(6) . 2H(2)O (I) has been solved at room temperature. Crystals of I are triclinic, space group with a = 12.8820(11) Angstrom, b = 15.580(2) Angstrom, c = 24.445(4) Angstrom, alpha = 79.270(12)degrees, beta = 86.688(11)degrees, gamma = 83.007(8)degrees, Z = 2. The structure of I consists of linear trinuclear cations with a +6 charge and noncoordinated anions and lattice water molecules. The central iron ion is located on an inversion center and is coordinated by 6 nitrogen atoms of 6 iptrz molecules bridging via the nitrogen atoms in the 1,2-positions. Each external iron atom completes its coordination sphere with three coordinated water molecules. The temperature dependent magnetic measurements of compound I and [Fe-3(iptrz)(6)(H2O)(6)](Trifl)(6) (II) show that both compounds exhibit a gradual spin conversion of the central iron ion centered at T-1/2 = 242 K for I and 187 K for II. Temperature dependent Mossbauer spectroscopy measurements on I show the behavior expected for a compound of this nature. The measurements on II indicate a strong influence of the spin conversion of the central iron ion on both external iron ions. The nature of this phenomenon is proposed to be connected to a very rigid lattice structure (ionic, H-bonding) connecting the trinuclear units.