Miguel A. Mendez-Rojas

Saturation in the near-resonance nonlinearities in a triazole-quinone derivative

Abstract In this work, we present a study of the third-order nonlinearities of a novel organic material, a derivative of the molecule 2-amino-1,2,3 triazole-quinone. The absorptive and refractive contributions to the nonlinearity were resolved using the z -scan technique with a 88 ps pulse source at 532 nm. The open aperture z -scan results show a nonlinearity arising from a combination of induced and saturable absorption, and the closed aperture the signature of a negative n 2 . The irradiance dependence of the closed aperture signal reveals a saturating nonlinearity which even decreases at high irradiances. A three-level model is used to explain the observed irradiance dependence of the nonlinearity.

Structure and properties of potential nonlinear optical materials

The synthesis, structure and properties of four ferrocene derivatives of 2-amino-1,2,3-triazole are reported. Solvatochromism is used as a screening process to assess the potential nonlinear optical behavior of these compounds. In general, this technique involves a number of assumptions, which may not be valid for organometallic complexes. Compound 3 crystallizes in space group P-1 with cell dimensions a = 5.771(2), b = 19.048(5), c = 19.343(5) Å and α = 61.104(4), β = 88.410(5), γ = 89.858(5)°; compound 5 crystallizes in space group P21/c with cell dimensions a = 12.545(2), b = 13.308(2), c = 20.513(4) Å and β = 104.035(3)°; compound 9 crystallizes in space group P21/n with cell dimensions a = 12.599(4), b = 14.734(4), c = 13.619(5) Å, and β = 107.63(2); compound 11 crystallizes in space group P-1 with cell dimensions a = 7.638(3), b = 9.619(4), c = 12.692(5) Å and α = 77.588(7), β = 78.416(7), γ = 71.357(7).

Structure and properties of N-phenylmaleimide derivatives

The crystal structures of 2-chloro-N-phenyl-triphenylphosphoranaminomaleimide 1, N-phenyl-di(triphenylphosphoranamino)maleimide 2a, a nitromethane solvate 2b, N-phenyl-2,3-dithiomaleimide 3, and N-phenyl-2,3-di(thiophenyl)maleimide have been determined. 1 crystallizes in space group P-1 with cell dimensions a = 10.432(6), b = 14.661(5), c = 9.376(4) Å, α = 93.13(4), β = 92.09(5), and γ = 79.08(4)°, 2a crystallizes in space group P21/c with cell dimensions a = 11.272(2), b = 28.910(7), c = 12.702(2) Å, and β = 115.31(2)°, 2b crystallizes in space group P-1 with cell dimensions a = 13.140(2), b = 13.796(3), c = 11.755(3) Å, α = 99.62(2), β = 100.23(2), and γ = 102.74(2)°, 3 crystallizes in space group C2/c with cell dimensions a = 42.926(5), b = 5.757(6), c = 8.259(3) Å, and β = 99.71(3)°, and 4 crystallizes in space group C2/c with cell dimensions a = 20.055(4), b = 10.370(6), c = 18.690(7) Å, and β = 100.32(2)°. Vicinal diazides of five-membered rings undergo the normal Staudinger reaction to form triphenylphosphoranamino derivatives. Compounds 1 and 2 fluoresce strongly, but nitromethane quenches the fluorescence of 2.

Bridging and chelating diphosphine ligands in Ru3(μ-H)(μ-N=CPh2)(CO)8(P—P). X-ray diffraction structures of Ru3(μ-H)(μ-N=CPh2)(CO)8(dmpe) and Ru3(μ-H)(μ-N=CPh2)(CO)8(bpcd)

AbstractTreatment of the azavinylidene-bridged cluster Ru3(μ-H)(μ-N=CPh2)(CO)10 (1) with the diphosphine ligand bis(dimethylphosphino)ethane (dmpe) gives Ru3( μ-H)(μ-N=CPh2)(CO)8(dmpe) (2) in moderate yield, while the ligand 4,5-bis(diphenylphosphino)-4-cyclopenten-1,3-dione (bpcd) reacts with Ru3( μ-H)(μ-N=CPh2)(CO)10 in the presence of Me3NO to furnish Ru3( μ-H)(μ-N=CPh2)(CO)8(bpcd) (3) in low yield. Each new cluster has been isolated and characterized in solution by IR and NMR (1H and 31P) spectroscopies, and the coordination mode exhibited by the ancillary diphosphine ligand in 2 and 3 has been established by X-ray crystallography. Ru3( μ-H)(μ-N=CPh2)(CO)8(dmpe) crystallizes in the monoclinic space group P2(1)/c, a = 10.791(1) Å, b = 16.377(1) Å, c = 18.148(1) Å, β = 96.675(2)°, V = 3185.3(4) Å3, Z = 4, Dcacl = 1.791 Mg/m3; R = 0.0360, Rw = 0.0866 for 7522 observed reflections with I > 2σ(I). Ru3(μ-H)(μ-N=CPh2)(CO)8(bpcd) crystallizes, as the CH2Cl2 solvate, in the triclinic space group

Synthesis and characterization of a 5,6-dibromobenzoquinone-phenyl maleimide adduct

P\bar 1

2-Amino-1,2,3-triazole derivatives

, a = 11.956(1) Å, b = 14.228(1) Å, c = 31.409(3) Å, α = 89.377(2)°, β = 79.344(2)°, γ = 77.235(2)°, V = 5118.4(8) Å3, Z = 2, Dcalc = 1.670 Mg/m3; R = 0.0557, Rw = 0.1069 for 10977 observed reflections with I > 2σ(I). The structural details of clusters 2 and 3 are contrasted with Ru3(μ-H)(μ-N=CPh2)(CO)7(μ-dppm)(η-dppm), which is the only known structurally characterized phosphine-substituted cluster of this genre.

Wavelength-resolved nonlinearity on triazole-quinone derivatives

A series of phenyldialkylamine, dimethoxyphenyl, and nitrothiophene derivatives of 2-amino-1,2,3-triazolequinones was characterized by NMR, IR, mass spectroscopy, cyclic voltammetry, and chemical analyses. The solvatochromic procedure was used to evaluate the potential of nine compounds for nonlinear optical applications, and the possible failure of this model is discussed. The crystal structures of seven compounds were determined: (4) P21/c, a = 15.430(3) Å, b = 7.633(2) Å, c = 15.940(3) Å, β = 105.19(3)° (5) P21/c, a = 20.201(2) Å, b = 9.6579(9) Å , c = 18.517(2) Å, β = 95.907(2)° (6) P-1, a = 7.769(2) Å, b = 8.515(3) Å, c = 17.312(5) Å, α = 89.347(7)°, β = 83.219(6)°, γ = 86.001(7)° (7) P-1, a = 8.1365(7) Å, b = 8.9605(8) Å, c = 11.630(1) Å, α = 79.553(2)°, β = 75.048(2)°, γ = 82.080(2)° (8) P-1, a = 8.298(3) Å, b = 9.720(3) Å, c = 10.033(3) Å, α = 84.803(6)°, β = 83.735(6)°, γ = 77.659(5)° (10) P21/n, a = 8.4300(7) Å, b = 13.980(1) Å, c = 13.975(1) Å, β = 106.590(2)° (12) P21/n, a = 7.715(2) Å, b = 14.206(3) Å, c = 12.758(3) Å, β = 91.016(5)°.

Near-resonance nonlinearities in triazole-quinone derivatives

A six-step synthesis was used to prepare a 5,6-dibromobenzoquinone-phenyl maleimide adduct (8). The structure of (8) and four of the intermediates are described. This dibromide is used as the starting material for the synthesis of 2-amino-1,2,3-triazoles which reacts with aldehydes and ketones to prepare materials for nonlinear optical studies. The crystal structures of five compounds were determined. (2) Pbca, a = 8.4183(7), b = 7.2479(7), c = 31.272(3) Å; (3) P-1, a = 8.2023(8), b = 8.8130(8), c = 9.3555(9) Å, α = 61.517(1), β = 73.630(1), γ = 86.788(2)°; (4) P21/c, a = 11.181(1), b = 7.9157(7), c = 15.248(1) Å, β = 90.691(2)°; (7) Pbca, a = 10.300(1), b = 20.184(3), c = 23.469(3) Å; (8) P21/n, a = 6.8975(6), b = 17.877(2), c = 14.089(1) Å, β = 91.968(2)°.