Crystal Structures of Half-Sandwich Ru(II) Complexes, [(η6-p-Cymene)(3-chloro-6-(1H-pyrazol-1-yl)pyridazine)Ru(X)]BF4, (X = Cl, Br, I)

Herein, we report the synthesis and single-crystal X-ray structures of three (η6-p-cymene)Ru(II) tetrafluoroborate salts, viz., [(η6-p-cymene)(3-chloro-6-(1H-pyrazol-1-yl)pyridazine)Ru(X)]BF4, (X = Cl, Br, I), Ru1-3. They were prepared by the reactions of [(η6-p-cymene)Ru(μ-X)(X)]2, (X = Cl, Br, I) with two-mole equivalents of 3-chloro-6-(1H-pyrazol-1-yl)pyridazine, under inert conditions at ambient temperatures, and subsequently precipitated by the addition of excess BF4− ions. Orange crystalline precipitates were obtained in good yields, from which the respective single crystals for X-ray diffraction analysis were recrystallized by slow evaporation from their methanolic/diethyl ether solutions. The Ru(II) complexes were characterized by various spectroscopic techniques and chemical methods, which included FTIR, 1H/13C NMR, UV-visible absorption, mass spectrometry, and elemental analysis. The molecular structures were solved by single-crystal X-ray crystal diffraction analysis. The complexes crystallized in the monoclinic crystal system in the P21/c (Ru1-2) and P21/n (Ru3) space groups. Density Functionals Theoretical (DFT) calculations were performed in methanol to gain an understanding of the electronic and structural properties of the complexes. Trends in the data metrics were established, and selected data were compared with the diffraction data. The electrophilicity indices of Ru1-3 follow the order Ru3 > Ru2 > Ru1, and the trend is in line with their anticipated order of reactivity towards nucleophiles.

Crystal structure of chlorido-(η 6-toluene)(5,5′-dimethyl-2,2′-bipyridine-κ2 N,N′)ruthenium(II) hexafluoridophosphate(V) ─ acetone (1/1) C22H26ClN2ORuPF6

C22H26ClN2ORuPF6, triclinic, P 1 ‾ $\overline{1}$ (no. 2), a = 10.2106(4) Å, b = 10.8139(4) Å, c = 11.1963(4) Å, α = 93.765(2)°, β = 90.418(1)°, γ = 94.324(2)°, V = 1229.98(8) Å3, Z = 2, R gt (F) = 0.0251, wR ref (F 2) = 0.0683, T = 100 K.

Crystal structure of chlorido-(η 6-toluene)(2,2′-bipyridine-κ2 N,N′)ruthenium(II) hexafluorophosphate, C17H16ClN2RuPF6

C17H16ClN2RuPF6, monoclinic, P21/c (no. 14), a = 14.4426(9) Å, b = 8.3311(5) Å, c = 16.413(1) Å, β = 109.2690°, V = 1864.2(2) Å3, Z = 4, R gt (F) = 0.0309, wR ref (F 2) = 0.0697, T = 173 K.

Chlorido-(η6-p-cymene)-(bis(pyrazol-1-yl)methane-κ2N,N′)Osmium(II) Tetrafluoroborate, C17H22BClF4N4Os

The powder of the arene osmium(II) complex, [Os(II)(dpzm)(η6-p-cym)Cl]BF4 (dpzm = di(1H-pyrazol-1-yl)methane; η6-p-cym = para-cymene), with a formula of C17H22BClF4N4Os (referred to herein as 1) was isolated from the reaction of [(η6-p-cym)Os(μ-Cl)(Cl)]2 with dpzm dissolved in acetonitrile and under a flow of nitrogen gas. It was characterized by spectroscopic techniques (viz., FTIR, 1H NMR, UV-Visible absorption). Yellow crystal blocks of 1 were grown by the slow evaporation from the methanolic solution of its powder. The single-crystal X-ray structure of 1 was solved by diffraction analysis on a Bruker APEX Duo CCD area detector diffractometer using the Cu(Kα), λ = 1.54178 Å as the radiation source, and 1 crystallizes in the monoclinic crystal system and the C2/c (no. 15) space group.

Crystal structure of chlorido-(η 6-p-cymene)-(N-(2-fluorophenyl)-1-(pyridin-2-yl)methanimine-κ 2 N,N′)ruthenium(II) – acetone (1/1), C22H23ClN2F7OPRu

C22H23ClN2F7OPRu, monoclinic, P21/c (no. 14), a = 7.30480(10) Å, b = 12.9540(3) Å, c = 28.7076(6) Å, β = 96.6990(10)°, V = 2697.95(9) Å3, Z = 4, R gt(F) = 0.0196, wR ref(F 2) = 0.0479, T = 100(2) K.

Crystal structure of η6-p-cymene-iodido-(N-isopropyl-1-(pyridin-2-yl)methanimine-κ2 N,N′)ruthenium(II) hexafluorophosphate(V), C19H26IN2F6Ru

C19H26IN2F6Ru, triclinic, P1̄ (no. 2), a = 9.240(2) Å, b = 10.019(3) Å, c = 12.689(3) Å, α = 78.921°, β = 81.596(10)°, γ = 83.654°, V = 1136.30(5) Å3, Z = 2, R gt(F) = 0.0174, wR ref(F 2) = 0.0440, T = 173 K.