Coordination Polymers of Co(NCS)₂ with Pyrazine and 4,4‘-Bipyridine:  Syntheses and Structures

Abstract

Three compounds were obtained from the reactions of Co(NCS)2 with pyrazine and 4,4‘-bipyridine in different solvents: Co(NCS)2(pyz)2 (1) has a 2D sheet structure, monoclinic, C2/m, a = 10.039(2) Å, b = 10.382(2) Å, c = 7.190(1) Å, β = 118.64(1)°, Z = 2; Co(NCS)2(H2O)2(4,4‘-bipy)·4,4‘-bipy (2) has linear Co−bipy−Co chains connected by hydrogen bonds between H2O and noncoordinated 4,4‘-bipy molecules to form stair type sheets, triclinic, P1̄, a = 7.450(1) Å, b = 9.020(1) Å, c = 10.122(1) Å, α = 107.74(1)°, β = 104.02(1)°, γ = 97.16(1)°, Z = 1; Co(NCS)2(4,4‘-bipy)2·2(CH3CH2)2O (3) has ether molecules intercalated between layers formed by Co(NCS)2 and coordinated 4,4‘-bipyridine ligands, monoclinic, P2/c, a = 11.483(2) Å, b = 11.397(3) Å, c = 13.609(1) Å, β = 107.55(1)°, Z = 2. Compounds 2 and 3 thermally decompose to form the same products. The identities of the decomposition products are discussed.

Synthesis, Crystal Structure, and Thermal and Magnetic Properties of New Transition Metal–Pyrazine Coordination Polymers

“…The ligand-rich 1:2 compound [Ni(SCN) 2 (pyrazine) 2 ] n (1) crystallizes in the centrosymmetric monoclinic space group C2/m with two formula units in the unit cell and is isotypic with the ligand-rich 1:2 manganese, [3] iron, [5] and cobalt [9] compounds reported recently. The asymmetric unit consists of one Ni 2+ cation, which occupies the position 2/ m, one thiocyanate anion, which is located on a crystallographic mirror plane, and one pyrazine ligand, which is located on a center of inversion.…”

Funktionale poröse Koordinationspolymere

“…[7,11,14,19] In Abbildung 5 ist ein Beispiel eines Koordinationspolymers mit dem 4,4'-bpy-Liganden dargestellt. [94] Mehrfach berichtet wurde über den Einsatz langer Brückenliganden mit geeigneten Spacern. [95][96][97][98][99][100] Zum Beispiel wurde durch Umsetzung des Liganden 9,9-Diethyl-2,7-bis(4-pyridylethinyl)fluoren mit Kupfernitrat in Ethanol ein außergewöhnlich weitmaschiges (25 25 2 ) durchdringungsfreies Polymernetz der Formel {[Cu(L) 2 (NO 3 ) 2 ]·x(Solvens)} n erhalten.…”

Antiferromagnetism in a Family of S = 1 Square Lattice Coordination Polymers NiX2(pyz)2 (X = Cl, Br, I, NCS; pyz = Pyrazine)

“…[54][55][56] Cu(II) ion forms Cu(NCS) 2 (pyz) which contains 2D rectangular layers made up of bi-bridged Cu-(NCS) 2 -Cu ribbons that are cross-linked via pyz bridges. 57 Substitution of 4,4'-bipyridine (4,4'-bipy) for pyz affords the related structure Cu(NCS) 2 (4,4'-bipy).…”