TY - JOUR
T1 - Several coordination modes of the pentadentate ligand 2,6-diacetylpyridinebis(thiosemicarbazone)
AU - Bino, Avi
AU - Cohen, Nira
PY - 1993/8/1
Y1 - 1993/8/1
N2 - The reaction between Zn(II) salts and the pentadentate ligand 2,6-diacetylpyridinebis(thiosemicarbazone) (H2daptsc) produces various compounds, depending upon the H+ ion concentration and the nature of the solvent from which the complex crystallizes. In the presence of nitric acid, the compound [Zn(H2daptsc)(H2O)2](NO3)2 (1) is obtained. The mononuclear complex in 1 possesses a pentagonal bipyramidal geometry with an almost planar, fully protonated, H2daptsc ligand and two axially bonded water ligands. Compound 2, [Zn2(daptsc)2]·2DMF, was prepared and crystallized from dimethylformamide. The dinuclear complex in 2 contains two fully deprotonated ligands which are coordinated to two Zn(II) ions with a distorted octahedral geometry. Compound 3, [Zn2(daptsc)2]·MeOH·H2o, was prepared and crystallized from methanol. The dinuclear unit in 3 is a structural isomer of complex 2. The complex is asymmetric in which one zinc atom is six-coordinate and the other one is four-coordinate. Compound 1 is monoclinic, space group Cc with a = 21.930(3), b = 12.940(2), c = 7.345(1) Å, β = 104.22(3)°, V = 2020(1) Å3 and Z = 4. Compound 2 is monoclinic, space group C2/c with a = 18.189(2), b = 15.716(2), c = 14.653(2) Å, β = 115.86(2)°, V = 3769(1) Å3 and Z = 4. Compound 3 is monoclinic, space group P1with a = 10.666(2), b = 16.282(2), c = 10.458(2) Å, α = 90.79(2), β = 117.94(2), γ = 80.70(2)°, V = 1579(1) Å3 and Z = 2.
AB - The reaction between Zn(II) salts and the pentadentate ligand 2,6-diacetylpyridinebis(thiosemicarbazone) (H2daptsc) produces various compounds, depending upon the H+ ion concentration and the nature of the solvent from which the complex crystallizes. In the presence of nitric acid, the compound [Zn(H2daptsc)(H2O)2](NO3)2 (1) is obtained. The mononuclear complex in 1 possesses a pentagonal bipyramidal geometry with an almost planar, fully protonated, H2daptsc ligand and two axially bonded water ligands. Compound 2, [Zn2(daptsc)2]·2DMF, was prepared and crystallized from dimethylformamide. The dinuclear complex in 2 contains two fully deprotonated ligands which are coordinated to two Zn(II) ions with a distorted octahedral geometry. Compound 3, [Zn2(daptsc)2]·MeOH·H2o, was prepared and crystallized from methanol. The dinuclear unit in 3 is a structural isomer of complex 2. The complex is asymmetric in which one zinc atom is six-coordinate and the other one is four-coordinate. Compound 1 is monoclinic, space group Cc with a = 21.930(3), b = 12.940(2), c = 7.345(1) Å, β = 104.22(3)°, V = 2020(1) Å3 and Z = 4. Compound 2 is monoclinic, space group C2/c with a = 18.189(2), b = 15.716(2), c = 14.653(2) Å, β = 115.86(2)°, V = 3769(1) Å3 and Z = 4. Compound 3 is monoclinic, space group P1with a = 10.666(2), b = 16.282(2), c = 10.458(2) Å, α = 90.79(2), β = 117.94(2), γ = 80.70(2)°, V = 1579(1) Å3 and Z = 2.
UR - http://www.scopus.com/inward/record.url?scp=0003058177&partnerID=8YFLogxK
U2 - 10.1016/S0020-1693(00)82817-0
DO - 10.1016/S0020-1693(00)82817-0
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AN - SCOPUS:0003058177
SN - 0020-1693
VL - 210
SP - 11
EP - 16
JO - Inorganica Chimica Acta
JF - Inorganica Chimica Acta
IS - 1
ER -