Synthesis, Crystal, and Molecular Structure of Bis(thiosemicarbazide)zinc(II) 1,5-Naphthalenedisulfonate Monohydrate [Zn(Tsc)2](1,5-Nds) · H2O

Abstract

Complex [Zn(Tsc)₂](Nds) · H₂O (I) (Tsc is thiosemicarbazide, NH₂NHC(=S)NH₂, and 1,5-Nds₂–is the double-deprotonated anion of 1,5-naphthalenedisulfonic acid, C₁₀H₆(SO₃)₂^2-) has been synthesized and studied by IR spectroscopy, thermogravimetry, and X-ray diffraction analysis. The structural units of crystal I are complex cations [Zn(Tsc)₂]²⁺, anions (Nds)^2–, and crystallization water molecules. The Zn atom is coordinated along the vertices of the distorted tetrahedron by two sulfur atoms and two nitrogen atoms of two bidentate chelate (S,N) Tsc ligands. The structural units of crystal I are joined together by a branched network of the N–H···O hydrogen bonds involving independent donor hydrogen atoms of the NH₂ and NH groups of Tsc molecules (nine of ten, except for the H(6A) atom), all six independent acceptor oxygen atoms of the SO₃ groups of the Nds^2– anions, and two acceptor hydrogen atoms and one donor oxygen atom of the water molecule.