Tahsin Nuri Durlu

Spectroscopic study and structure of (E)-2-[(2-chlorobenzylimino)methyl]methoxyphenol.

(E)-2-[(2-chlorobenzylimino)methyl]methoxyphenol has been synthesized from the reaction of 2-hydroxy-3-methoxy-1-benzaldehyde(o-vanillin) with 2-chlorobenzylamine. The title compound has been characterized by using elemental analysis, FT-IR, (1)H NMR, (13)C NMR and UV-vis spectroscopic techniques. The crystal structure of the title compound has also been examined cyrstallographically. It crystallizes in the orthorhombic space group Pbca with unit cell parameters: a = 7.208(1) A, b = 13.726(2) A, c = 27.858(4) A, V = 2756.0(1) A(3), D(c) = 1.18 g cm(-3) and Z = 8. The crystal structure was solved by direct methods and refined by full-matrix least squares to a find R = 0.046 for 2773 observed reflections.

Structures of four- and six-coordinate monomers of [N,N′-bis(5-chlorosalicylidene)-1,3-diaminopropane]nickel(II)

Abstract[N,N′-Bis(5-chlorosalicylidene)-1,3-diaminopropane]nickel(II) [Ni(C17H14N2O2Cl2)] 1 and [N,N′-Bis(5-chlorosalicylidene)-1,3-diaminopropane]nickel(II) dihydrate [Ni(C17H14N2O2Cl2).2(H2O)] 2 were synthesized, and their crystal structures were determined. Compound 1 is monoclinic, space group C2/c, a = 21.063(4), b = 8.151(1), c = 9.421(2) Å,β = 94.16(1)°, V = 1613.2(5) Å3, Z = 4 and Dc = 1.680 g cm−3. Compound 1 contains a crystallographic twofold axis, and the whole molecule is not planar. The two Schiff base moieties, which in themselves are planar, are twisted with respect to one another. The least-squares planes through each half of the molecule are inclined at an angle of 29.1(1)°. The Ni atom is in a square-planar environment. The Ni—N and Ni—O distances are 1.958(2) and 1.910(2) Å, respectively. Compound 2 is orthorhombic, space group Pnma, witha = 7.892(1), b = 23.396(2), c = 9.992(1) Å, V = 1846.3(3) Å3, Z = 4 and Dc = 1.597 g cm−3. Compound 2 has crystallographic mirror symmetry, and again, the whole molecule is not planar. The two planar Schiff base moieties inclined at an angle of 38.7(1)°. The Ni atom is in a distorted octahedral geometry and coordinated by the donor atoms of the ligand in the horizontal plane, and the coordination sphere is completed by O atoms of two water molecules.

N-(p-Chloro­phenyl)-3,3-di­phenyl-4-(β-phenyl­styryl)azetidin-2-one

In the title compound, C35H26ClNO, the four-membered β-lactam ring is essentially planar, with a maximum deviation of 0.012 (1) A for the N atom. The C—C bond lengths in the β-lactam ring are 1.591 (2) and 1.549 (2) A. The two phenyl rings attached to the β-lactam ring are nearly perpendicular to each other [83.2 (1)°].

3,3-Dichloro-1,4-diphenylazetidin-2-one

In the crystal structure of the title compound, C 15 H 11 Cl 2 NO, the Cl-C-Cl plane is nearly perpendicular to the four-membered β-lactam ring [89.0 (2)°] and the C-C bond distances in this group are 1.571(6) and 1.543 (7) A. The most out-of-plane atom from the best plane of the lactam ring is the carbonyl C atom [-0.029 (5) A]. The dihedral angle between the best planes of the phenyl rings is 77.4(2)°.

Dipotassium maleate with boric acid

In the title compound, poly[(mu3-boric acid)-mu4-maleato-dipotassium], [K2(C(4)H(2)O(4)){B(OH)3}]n, there are two independent K+ cations, one bonded to seven O atoms (three from boric acid and four from maleate), and the other eight-coordinate via three boric acid and four maleate O atoms and a weak eta(1)-type coordination to the C=C bond of the maleate central C atoms. Hydrogen bonding links the boric acid ligands and maleate dianions, completing the packing structure.

[N,N'-Bis(5-bromosalicylidene)-1,3-diaminopropane]copper(II)

The title compound, [Cu(C 17 H 14 Br 2 N 2 O 2 )], has a crystallographic twofold axis. The coordination geometry about the Cu II centre is a tetrahedrally distorted square plane formed by the four-coordinate N 2 O 2 donor set of the Schiff base imine-phenol ligand. The Cu-N and Cu-O distances are 1.967 (5) and 1.914 (4) A, respectively.

Crystal Structure and Tautomerism of 1-[N-(4-Iodophenyl)]aminomethylidene-2(1H)naphthalenone

1-[N-(4-Iodophenyl)]aminomethylidene-2(1H)naphthalenone (1) (C17H12NOI) has been studied by X-ray analysis, IR, 1H NMR, UV and AM1 semi-empirical quantum mechanical methods. It crystallises in the monoclinic space group P21/n with a = 4.844(3), b = 21.428(2), c = 13.726(2) Å, ß = 93.07(2)° (R1 =0.032 for 4132 reflections [I > 2σ(I)]). The title compound is not planar and an intramolecular hydrogen bond connects O1 and N1 [2.530(4) Å]. Complementary IR, 1H NMR and UV measurements out. Tautomerism and conformations of the title semi-empirical quantum mechanical calculations and the results are compared with the X-ray data.

High voltage electron microscopy studies of thin foil martensite in FeNiC alloys

Conventional transmission electron microscopy studies of thin foil martensites in some ferrous alloys showed that morphology and substructure of this martensite are different than those of bulk martensite of the same alloys (1-4). Oshima and Wayman (1,2) examined the substructure of thin loll and bulk martensites in some Fe-b~-(Cr)-C alloys and described the substructure of thin foil martensite as more complex.In their study of thin foil martensite formation in Fe-Ni and Fe-Ni-C alloys Maki and Wayman (3,4) made a detailed comparison between thin foil and bulk martensites.These authors reported that thin foil martensites thicken gradually during cooling and contain no midrib. They also noted the more segmented appearance of (ll2) type transformation twins.

Spectroscopic studies and structure of 3-methoxy-2-[(2,4,4,6,6-pentachloro-1,3,5,2λ5,4λ5,6λ5-triazatriphosphin-2-yl)oxy]benzaldehyde

The compound called 3-methoxy-2-[(2,4,4,6,6-pentachloro-1,3,5,2λ5,4λ5,6λ5-triazatriphosphin-2-yl)oxy]benzaldehyde has been synthesized from the reaction of 2-hydroxy-3-methoxybenzaldehyde with hexachlorocyclotriphosphazene. It has been characterized by elemental analysis, MS, IR, 1H NMR, 13C NMR, 31P NMR and UV-visible spectroscopic techniques. The structure of the title compound has been determind by X-ray analysis. Crystals are orthorhombic, space group P212121, Z = 4, a = 7.705(1), b = 12.624(1), c = 17.825(2) Å, R1 = 0.0390 and wR2 = 0.1074 [I > 2σ(I)], respectively.

Syntheses, Structures and Second-order Nonlinear Optical Behavior of (E)-N-(4-Nitrobenzylidene)-3,4-dimethylaniline and (E)-N-(3-Nitrobenzylidene)-3,4-dimethylaniline

(E)-N-(4-Nitrobenzylidene)-3,4-dimethylaniline (1) and (E)-N-(3-nitrobenzylidene)-3,4-dimethylaniline (2) have been synthesized, and their crystal structures have been determined by X-ray diffraction analysis. Linear optical characteristics have been evaluated experimentally using UV/Vis spectroscopy and theoretically using the configuration interaction (CI) method. The maximum onephoton absorption (OPA) wavelengths of the studied compounds are shorter than 450 nm, giving rise to good optical transparency in the visible and near IR regions. The ab initio quantum-mechanical calculations (finite field second-order Møller-Plesset perturbation theory) of the investigated molecules have been carried out to compute the electric dipole moment (μ) and the first hyperpolarizability (β ) values. The ab initio results suggest that the title compounds might have microscopic second-order nonlinear optical (NLO) behavior with non-zero values. Graphical Abstract Syntheses, Structures and Second-order Nonlinear Optical Behavior of (E)-N-(4-Nitrobenzylidene)-3,4-dimethylaniline and (E)-N-(3-Nitrobenzylidene)-3,4-dimethylaniline