REACTION OF BIS(ISOPROPYLXANTHATO)NICKEL(II) WITH NITROGEN DONOR LIGANDS IV

Abstract

The coordination compounds [Ni(i-prxa)(L1)] (i-prxa) and [Ni(i-prxa)2(L2)] (i-pr = i-C3H7, xa = S2CO−, L1 =tris(2-aminoethyl)amine (taa), L2 = N-(2-aminoethyl)-1,3-diaminopropane (apa), bis(3-aminopropyl)amine (baa), 2-(aminomethyl)pyridine (amp), 2,2′-dipyridylamine (dpa) or 2,2′:6′,2”-terpyridine (tpy) have been synthesized by reaction of bis(isopropylxan-that)nickel(II) with the corresponding nitrogen donor ligands. The complexes have been characterized on the basis of analytical data, magnetochemical and conductivity measurements, electronic and infrared spectroscopies as octahedral nickel(II) compounds. The structures of [Ni(i-prxa)2(dpa)]-dmso (1) and [Ni(i-prxa)2(amp)] (2) have been determined by a single-crystal X-ray analysis. In both structures nickel is coordinated by four sulfur atoms of two isopropylxanthato ligands and by two nitrogen atoms of the other N-donor ligand. The coordination of donor atoms around nickel in (1) and (2) is distorted cis-octahedral with an S4N2 donor set. For (1): C20H29N3NiO3S5, monoclinic., P21/c, a= 11.330(2),b= 14.890(3). c= 16.940(3)Å β = 04.65(3)°, V= 2764.9(9)Å3, Z = 4, Mr = 578.5, Dcale = 1.390 g/cm3, λ = 0.71073Å, μ = 1.104mm- 1, F(000)= 1208, R = 0.053, Rw =0.131. For(2): C14H22N2NiO2S4, monoclinic, P21/ c, a=19.395(4), b = 9.977(2), c = 20.305(4) Å, β = 98.14(3)°, V= 3889.5(14) Å3, Z = 8, Mr = 473.3, D calc= 1.494g/cm3, λ = 0.71073A, μ= 1.435mm−1, F(000) = 1820, R= 0.0527, Rw . = 0.1432.