TY - JOUR
T1 - Assembly of a helical zinc(II) chain and a two-dimensional cadmium(II) coordination polymer using picolinate and sulfate anions as bridging ligands
AU - Papatriantafyllopoulou, Constantina
AU - Raptopoulou, Catherine P.
AU - Terzis, Aris
AU - Janssens, Jozef F.
AU - Manessi-Zoupa, Evy
AU - Perlepes, Spyros P.
AU - Plakatouras, John C.
PY - 2007/9/20
Y1 - 2007/9/20
N2 - The initial use of the picolinate (pic-)/sulfate "blend" in metal chemistry has yielded two neutral coordination polymers. Complexes [Zn2(SO4)(pic)2(H2O) 3]n (1) and [Cd2(SO4)(pic)2(H2O) 3]n · nH2O (2 · nH2O) were prepared by the reaction of MSO4 · xH2O [M = Zn, x = 7; M = Cd, x = 8/3] with one equivalent of picolinic acid (picH) in aqueous solution in the absence of external base. The structures of both compounds have been determined by single-crystal X-ray crystallography. Complex 1 consists of helical chains which interact through hydrogen bonds and stacking interactions to form a 3D, 5-connected network. Complex 2 · nH2O consists of ribbons that are crosslinked by the sulfato ligands to give a 2D, 4-connected network. Hydrogen bonds and stacking interactions lead to the formation of a 3D supramolecular architecture. In both coordination complexes, the pic- ligand adopts two different bridging coordination modes (2.111 and 2.201 in 1; 2.211 and 2.201 in 2 · nH2O), while the SO42 - behaves as a bidentate bridging 2.1100 (Harris notation) ligand. The Zn(II) complex has 5- and 6-coordinate metal ions, whereas 6- and 7-coordinate CdII atoms are present in 2 · nH2O. Characteristic vibrational (IR, Raman) bands are discussed in terms of the known structures, and the coordination modes of the pic- and SO42 - ligands. The thermal decomposition of the Cd(II) compound has also been studied.
AB - The initial use of the picolinate (pic-)/sulfate "blend" in metal chemistry has yielded two neutral coordination polymers. Complexes [Zn2(SO4)(pic)2(H2O) 3]n (1) and [Cd2(SO4)(pic)2(H2O) 3]n · nH2O (2 · nH2O) were prepared by the reaction of MSO4 · xH2O [M = Zn, x = 7; M = Cd, x = 8/3] with one equivalent of picolinic acid (picH) in aqueous solution in the absence of external base. The structures of both compounds have been determined by single-crystal X-ray crystallography. Complex 1 consists of helical chains which interact through hydrogen bonds and stacking interactions to form a 3D, 5-connected network. Complex 2 · nH2O consists of ribbons that are crosslinked by the sulfato ligands to give a 2D, 4-connected network. Hydrogen bonds and stacking interactions lead to the formation of a 3D supramolecular architecture. In both coordination complexes, the pic- ligand adopts two different bridging coordination modes (2.111 and 2.201 in 1; 2.211 and 2.201 in 2 · nH2O), while the SO42 - behaves as a bidentate bridging 2.1100 (Harris notation) ligand. The Zn(II) complex has 5- and 6-coordinate metal ions, whereas 6- and 7-coordinate CdII atoms are present in 2 · nH2O. Characteristic vibrational (IR, Raman) bands are discussed in terms of the known structures, and the coordination modes of the pic- and SO42 - ligands. The thermal decomposition of the Cd(II) compound has also been studied.
KW - Cadmium(II) sulfato complexes
KW - Coordination polymers
KW - Crystal structures
KW - Metal picolinate complexes
KW - Vibrational spectroscopy
KW - Zinc(II) sulfato complexes
UR - https://www.scopus.com/pages/publications/34548349210
U2 - 10.1016/j.poly.2007.05.022
DO - 10.1016/j.poly.2007.05.022
M3 - Article
SN - 0277-5387
VL - 26
SP - 4053
EP - 4064
JO - Polyhedron
JF - Polyhedron
IS - 15
ER -