TY - JOUR
T1 - Manganese (II) coordination complexes involving nitronyl nitroxide radicals
AU - Fettouhi, Mohammed
AU - Khaled, Mazen
AU - Waheed, Abdel
AU - Golhen, Stéphane
AU - Ouahab, Lahcène
AU - Sutler, Jean Pascal
AU - Kahn, Olivier
PY - 1999
Y1 - 1999
N2 - Three-new complexes involving nitronyl nitroxide and PhCOO- or N3- ligands have been synthesized and structurally and magnetically characterized. These compounds are formulated as Mn(L)4(X)2.nH2O, L = 2-(p-pyridyl)-4,4,5,5-tetramethylimidazoline-l-oxyl-3-oxide(PNN)or 2-(p-pyridyl)-4,4,5,5-tetramethylimidazoline-l-oxyl (PN) and X = PhCOO- or N3-. Compound A [Mn(PNN)2(PhCOO)2(H2O)2] presents the following structural parameters: triclinic, space group P1∼ (No. 2), a = 6.859(1) Å, b = 11.271(2) Å, c = 13.978(6) Å, α = 88.88(2)°, β -89.38(2)°, γ = 78.28(2)°, Z = 1. The complex has a centrosymmetric distorted octahedral geometry in which the manganese ion is bound to two radical ligands through the nitrogen atom of the pyridine rings, two benzoate groups, and two water molecules. The two compounds B [Mn(PNN)4(N3)2] and C [Mn(PN)4(N3)2] are isostructural with the following structural parameters: B; triclinic, space group P1∼ (No. 2), a = 7.177(4) Å, b = 13.767(3) Å, c = 13.928(4) Å, α = 90.20(2)°, β= 102.94(4)°, γ = 91.86(4)°, Z = 1; C, triclinic, space group P1∼ (No. 2), a = 7.004(2) Å, b = 13.885(1) Å, c = 14.036(2) Å, α = 90.34(1)°, β= 101.42(2)°, γ = 92.92(1)°, Z = l. They adopt a centrosymmetric tetragonally distorted octahedral geometry in which the manganese ion is bound to four radical ligands through the nitrogen atom of the pyridine rings, and the azido groups occupy the apical positions. For all three compounds A, B, and C intramolecular ferromagnetic interactions between the Mn(II) ion and the nitronyl nitroxide radicals are observed, but at very low temperatures, intermolecular antiferromagnetic interactions dominate.
AB - Three-new complexes involving nitronyl nitroxide and PhCOO- or N3- ligands have been synthesized and structurally and magnetically characterized. These compounds are formulated as Mn(L)4(X)2.nH2O, L = 2-(p-pyridyl)-4,4,5,5-tetramethylimidazoline-l-oxyl-3-oxide(PNN)or 2-(p-pyridyl)-4,4,5,5-tetramethylimidazoline-l-oxyl (PN) and X = PhCOO- or N3-. Compound A [Mn(PNN)2(PhCOO)2(H2O)2] presents the following structural parameters: triclinic, space group P1∼ (No. 2), a = 6.859(1) Å, b = 11.271(2) Å, c = 13.978(6) Å, α = 88.88(2)°, β -89.38(2)°, γ = 78.28(2)°, Z = 1. The complex has a centrosymmetric distorted octahedral geometry in which the manganese ion is bound to two radical ligands through the nitrogen atom of the pyridine rings, two benzoate groups, and two water molecules. The two compounds B [Mn(PNN)4(N3)2] and C [Mn(PN)4(N3)2] are isostructural with the following structural parameters: B; triclinic, space group P1∼ (No. 2), a = 7.177(4) Å, b = 13.767(3) Å, c = 13.928(4) Å, α = 90.20(2)°, β= 102.94(4)°, γ = 91.86(4)°, Z = 1; C, triclinic, space group P1∼ (No. 2), a = 7.004(2) Å, b = 13.885(1) Å, c = 14.036(2) Å, α = 90.34(1)°, β= 101.42(2)°, γ = 92.92(1)°, Z = l. They adopt a centrosymmetric tetragonally distorted octahedral geometry in which the manganese ion is bound to four radical ligands through the nitrogen atom of the pyridine rings, and the azido groups occupy the apical positions. For all three compounds A, B, and C intramolecular ferromagnetic interactions between the Mn(II) ion and the nitronyl nitroxide radicals are observed, but at very low temperatures, intermolecular antiferromagnetic interactions dominate.
UR - https://www.scopus.com/pages/publications/0000072397
U2 - 10.1021/ic9905751
DO - 10.1021/ic9905751
M3 - Article
AN - SCOPUS:0000072397
SN - 0020-1669
VL - 38
SP - 3967
EP - 3971
JO - Inorganic Chemistry
JF - Inorganic Chemistry
IS - 18
ER -