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Một phức hợp siêu phân tử 3D mới, [Co(2-Me-3,4-qudc)(Phen)2(H2O)]·4.5H2O (2-Me-3,4-qudc = 2-methylquinoline-3,4-dicarboxylate dianion, phen = 1,10-phenanthroline), đã được tổng hợp dưới điều kiện nhẹ và được đặc trưng bởi phân tích phần tử, phổ IR, phân tích nhiệt trọng lượng và diffraksyon tia X đơn tinh thể. Phức hợp kết tinh trong nhóm không gian đơn nghiêng P2(1)/n với các tham số ô đơn vị a = 13.1701(12) Å, b = 18.6728(19) Å, c = 15.0683(16) Å, β = 13.617(2), V = 3395.3(6) ų, Z = 4. Khung 3D của hợp chất này được hình thành thông qua các liên kết hydro O–H⋯O và tương tác xếp chồng π–π. Nước trong mạng tinh thể ổn định ở nhiệt độ phòng, nhưng khi bị phân hủy nhiệt, sự mất nước là không thể thu hồi. Một phức hợp siêu phân tử mới [Co(2-Me-3,4-qudc)(Phen)2(H2O)]·4.5H2O đã được tổng hợp và đặc trưng.

The He(I) and He(II) photoelectron (PE) spectra of the N-methylamides of N-acetyldehydroalanine (1) and N-acetyldehydrophenylalanine (2) are presented and discussed, within a comprehensive investigation of the electronic structure and conformation ofα, β-dehydroamino acid derivatives. Three different procedures have been adopted for the synthesis of1. The PE results of the “peptide units” are in tune with theoretical predictions and they support the view that in the vapor phase the tendency towards a planar arrangement around the torsion angle φ is much more marked for N-acetyldehydroalanine-NHR systems than for (Z)-substituted ones.

The copper complex [Cu(C23H27Br2N4O2)(H2O)(NO3)]2 was synthesized and characterized by X-ray diffraction. The complex crystallizes in the triclinic system with space group P-1, lattice parameters: a = 13.2293(18) (Å), b = 14.184(20) (Å), c = 16.522(23) (Å), α = 91.923(2)°, β = 111.777(2)°, γ = 111.259(2)°, V = 2632.0(6) Å3, Z = 4, D c  = 0.88 Mg m−3. In the title compound [Cu(C23H27Br2N4O2)(H2O)(NO3)]2, the coordination polyhedron of the Cu atom is a square-planar environment. The structure consists of mononuclear units in which the copper(II) ions are linked in the plane by N, N′ iminato and O, O′ phenoxo atoms. In addition the crystal lattice contains one water molecule per unit. Dissymmetric ligand was efficiently synthesized and used to prepfsare a copper(II) complex which was characterized by X-ray diffraction

N-Aryl-N-methylaminocyclohexanols 10–12 were synthesised and their crystal structures were studied by X-ray diffraction. Compound 10 crystallizes in the monoclinic space group Cc with cell parameters of a = 13.7366(2) Å, b = 13.7234(2) Å, c = 26.9057(5) Å, β = 93.0900(5)°, V = 5064.70(14) Å3 and Z = 16. Compound 11 crystallizes in the trigonal space group $$P\bar{3}$$ with cell parameters of a = b = 25.4429(4) Å, c = 9.6417(2) Å, V = 5405.27(16) Å3 and Z = 18. Compound 12 crystallizes in the monoclinic space group P21/n with cell parameters of a = 9.9511(2) Å, b = 11.5777(2) Å, c = 20.5968(4) Å, β = 95.5037(9)°, V = 2362.04(8) Å3 and Z = 8. All three structures were characterised by arrays of hydrogen bonding interactions and these crystallographic studies revealed conformations of 10–12 which gave valuable information into the mechanism of the reaction during their formation. Crystals of (RS,RS,RS)-3-[N-methyl-N-(4'-methoxyphenyl)amino]cyclohexane-1,2-diol, (RS,RS,RS)-3-(N-methyl-N-phenylamino)cyclohexane-1,2-diol and (RS,RS,RS)-2-fluoro-6-(N-methyl-N-phenylamino)cyclohexan-1-ol were synthesised and their structures were studied by X-ray diffraction. .

The compound, 1-(ethoxymethyl)-6-(phenylselenyl)-5-ethyl uracil, crystallizes in the monoclinic space group P21/n with unit cell parameters a = 5.304(1), b = 21.261(4), c = 13.996(4) Å, β = 94.30(2)°, and Z = 4. The acyclic chain C1′, O4′, C4′, C5′ is in fully extended form and nearly perpendicular to the uracil base. The molecules are held together by van der Waal's forces.

The crystal structure of N-(4-nitrophenyl)-N-phenylsulfonamide (C18H14N2O4S), a derivative of sulfonamide, has been determined by X-ray diffraction method using CuKα radiation. The compound crystallizes in the monoclinic space groupP21/n, witha=24.463(1),b=5.745(2),c=11.428(3)Å andβ=94.39(2)°. The structure was solved by direct methods and refined by full-matrix least squares to a finalR value of 0.045 with 3032 unique reflections. The dihedral angle between the substituents phenyl ring B and the phenyl A is 94.7(3)°. The S atom is in the usual distorted tetrahedral configuration.

The crystal structure of salicylaldehyde N(4)-phenyl thiosemicarbazone is described. The compound crystallizes in the triclinic crystal system, space group P $$ \bar 1, $$ Z = 6, V = 2002.1(5) Å3 with unit cell parameters a = 10.6733(15) Å, b = 13.8856(19) Å, c = 14.052(2) Å, α = 81.851(2)°, β = 77.061(2)° and γ = 83.482(2)°. There are three independent molecules in the asymmetric unit. The crystal structure reveals that the compound exists in the thione form and S1 and N3 are at E configuration to each other with respect to N2–C7 bond. Similarly, S2 and N6 are trans to each other with respect to N5–C21 bond in the second molecule of the asymmetric unit and S3 and N9 are trans to each other with respect to N8–C35 bond in the third molecule of the asymmetric unit. The packing of the molecules in the crystal lattice is stabilized by intermolecular hydrogen bonds. The compound salicylaldehyde N(4)-phenyl thiosemicarbazone crystallizes in the triclinic crystal system, space group P $$ \bar 1, $$ Z = 6, V=2002.1(5) Å3 with unit cell parameters a = 10.6733(15) Å, b = 13.8856(19) Å, c = 14.052(2) Å, α = 81.851(2)°, β = 77.061(2)° and γ = 83.482(2)°.

The title compound crystallizes in space groupP¯1 (No. 2) witha=8.796(6),b=10.754(3),c=12.271(2) Å,α=68.56(2),β=67.68(3),γ=78.87(4)°, andZ=2. The structure was solved by direct methods and refined by full-matrix least squares toR=0.048. In the tetrahedral geometry around phosphorus, the P-O(22) bond of 1.464(2) Å is shorter than expected. The O⋯O hydrogen bond results in dimer formation, and the substituted glycol shows staggered conformation along the C(12)-C(3) vector.

The crystal structure of 2,5-dioxo-4-imidazolidineethanesulfonamide or homocysteine sulfonamide hydantoin, C5H9N3O4S (1) was obtained by single-crystal X-ray diffraction. Crystallization of 1 occurs in the centrosymmetric monoclinic space group C2/c (No. 15) with a = 15.653(2), b = 9.6489(10), c = 11.066(2) Å, β = 94.64(2)○, and Z = 8. Molecules are in an extended structure with a C–C–C–S torsion angle of −174.2(1)○. The imidazolidinedione ring is planar and the sulfonamide group has a distorted tetrahedral geometry. A three-dimensional network of intermolecular hydrogen bonding occurs within the crystal lattice involving both imidazolidinedione and sulfonamide functional groups.