TY - JOUR

T1 - Complexation of Cobalt(II), Nickel(II), Copper(II), and Zinc(II) Hexafluorosilicates with Nicotinamide in Aqueous Solution

AU - Cherkasova, T. G.

AU - Pervukhina, N. V.

AU - Kuratieva, N. V.

AU - Sannikova, V. A.

AU - Tatarinova, E. S.

AU - Cherkasova, E. V.

PY - 2019/9/1

Y1 - 2019/9/1

N2 - Abstract: The new complexes [M(NA)2(H2O)4]SiF6 ⋅ 2H2O, where M2+ = Co, Ni, Zn (complexes I, II, and III, respectively), and NA = C6H6N2O is nicotinamide, [Cu(NA)2(SiF6)(H2O)2] ⋅ 2H2O (IV), and (HNA)2SiF6 (V) have been synthesized from aqueous solutions and studied by chemical, IR spectroscopic, and X-ray diffraction analyses. Their unit cell parameters are a = 16.2448(18) Å, b = 6.8834(8) Å, c = 10.0767(11) Å, β = 102.765(3)°, V = 1098.92 Å3, space group C2 for I; a = 16.1591(7) Å, b = 6.8777(3) Å, c = 10.0314(5) Å, β = 102.410(1)°, V = 1088.82 Å3, space group C2 for II; a = 16.2265(6) Å, b = 6.8965(3) Å, c = 10.0696(5) Å, β = 102.390(1)°, V = 1100.60 Å3, space group C2 for III; a = 6.5915(4) Å, b = 7.7670(4) Å, c = 10.1506(5) Å, α = 110.7390(10)°, β = 105.824(2)°, γ = 95.448(2)°, V = 456.868 Å3, space group( Formula Presented) IV; and a = 14.1904(7) Å, b = 9.0468(4) Å, c = 11.8160(7) Å, β = 106.277(2)°, V = 1456.1 Å3, space group C2/c for V. Complexes I–III are isostructural and represent ionic compounds formed by hexafluorosilicate anions and complex cations. The coordination polyhedron of the metal is a slightly distorted octahedron built of the O atoms of four coordinated water molecules and the two N atoms of two pyridine rings of two nicotinamide molecules in trans positions of the polyhedron. Complex IV has a polymeric chain structure. The coordination polyhedron of the copper cation represents an octahedron, which is elongated along its axis and built of the two N atoms of two pyridine rings of two nicotinamide molecules, the two O atoms of coordinated water molecules, and the two F atoms of hexafluorosilicate anions acting as bridges between neighboring cations. In the structure of complex V, the nitrogen atom of the pyridine ring HNA+ is protonated. The geometry of hexafluorosilicate anions is identical in all the five complexes. The structures have branched networks of hydrogen bonds.

AB - Abstract: The new complexes [M(NA)2(H2O)4]SiF6 ⋅ 2H2O, where M2+ = Co, Ni, Zn (complexes I, II, and III, respectively), and NA = C6H6N2O is nicotinamide, [Cu(NA)2(SiF6)(H2O)2] ⋅ 2H2O (IV), and (HNA)2SiF6 (V) have been synthesized from aqueous solutions and studied by chemical, IR spectroscopic, and X-ray diffraction analyses. Their unit cell parameters are a = 16.2448(18) Å, b = 6.8834(8) Å, c = 10.0767(11) Å, β = 102.765(3)°, V = 1098.92 Å3, space group C2 for I; a = 16.1591(7) Å, b = 6.8777(3) Å, c = 10.0314(5) Å, β = 102.410(1)°, V = 1088.82 Å3, space group C2 for II; a = 16.2265(6) Å, b = 6.8965(3) Å, c = 10.0696(5) Å, β = 102.390(1)°, V = 1100.60 Å3, space group C2 for III; a = 6.5915(4) Å, b = 7.7670(4) Å, c = 10.1506(5) Å, α = 110.7390(10)°, β = 105.824(2)°, γ = 95.448(2)°, V = 456.868 Å3, space group( Formula Presented) IV; and a = 14.1904(7) Å, b = 9.0468(4) Å, c = 11.8160(7) Å, β = 106.277(2)°, V = 1456.1 Å3, space group C2/c for V. Complexes I–III are isostructural and represent ionic compounds formed by hexafluorosilicate anions and complex cations. The coordination polyhedron of the metal is a slightly distorted octahedron built of the O atoms of four coordinated water molecules and the two N atoms of two pyridine rings of two nicotinamide molecules in trans positions of the polyhedron. Complex IV has a polymeric chain structure. The coordination polyhedron of the copper cation represents an octahedron, which is elongated along its axis and built of the two N atoms of two pyridine rings of two nicotinamide molecules, the two O atoms of coordinated water molecules, and the two F atoms of hexafluorosilicate anions acting as bridges between neighboring cations. In the structure of complex V, the nitrogen atom of the pyridine ring HNA+ is protonated. The geometry of hexafluorosilicate anions is identical in all the five complexes. The structures have branched networks of hydrogen bonds.

KW - 3-pyridiniumcarboxamide cation

KW - cobalt(II)

KW - complex compounds

KW - copper(II)

KW - hexafluorosilicate anion

KW - IR spectroscopy

KW - nickel(II) zinc(II)

KW - nicotinamide

KW - X-ray diffraction analysis

KW - ISONICOTINAMIDE

KW - CD(II)

KW - ACIDS

KW - CRYSTAL-STRUCTURE

KW - CU(II)

KW - ZN(II)

KW - METHYLNICOTINAMIDE

KW - CO(II)

KW - NI(II)

UR - http://www.scopus.com/inward/record.url?scp=85073444954&partnerID=8YFLogxK

U2 - 10.1134/S0036023619090055

DO - 10.1134/S0036023619090055

M3 - Article

AN - SCOPUS:85073444954

VL - 64

SP - 1120

EP - 1126

JO - Russian Journal of Inorganic Chemistry

JF - Russian Journal of Inorganic Chemistry

SN - 0036-0236

IS - 9

ER -