Coordination compounds of nickel with trithiocyanuric acid. Part II. Crystal and molecular structure of [Ni(taa)(ttcH)] (taa = tris-(2-aminoethyl)amine, ttcH(3) = trithiocyanuric acid)

Coordination compounds of compositions [Ni(taa) (ttcH)] (1), [Ni(teta)(ttcH )] (2), [Ni(sper)(ttcH)]. 5H(2)O (3), [Ni(chxn)(2)(ttcH)] (4) and [Ni(1,3-p n)(ttcH)(H2O)] (5), where taa = tris-(2-aminoethyl)-amine, ttcH(3) = trithi ocyanuric acid [1,3,5-triazine-2,4,6-trithione], teta = triethylenetetramin e, sper = spermine [(N,N'-bis-(3-aminopropyl)- 1,4-butanediamine], chxn = t rans-1,2-diaminocyclohexane, 1,3-pn = 1,3-diaminopropane, (the ligands are depicted in Scheme 1) have been prepared and characterized by C, H, N, S an alysis, i.r. and u.v.-vis. spectroscopies and magnetochemical measurements. Those complexes containing water were also studied by thermal analysis. X- ray analysis of [Ni(taa)(ttcH)] revealed a trigonal bipyramidal geometry ar ound the Ni-II centre, which can be increased to octahedral by a non-bondin g interaction between Ni and the S atom of the trithiocyanuric dianion [Ni- S(3)= 2.6650(10) Angstrom].