| The reaction of picolinaldehyde N-oxide and 4-aminoantipyrine in ethanol in the molar ratio of 1:1 gave the ligand. At the same time of yellow single crystal was obtained. The reaction of Schiff base and Cu(C104)2in absolute ethanol in the molar ratio of 1:1, coinplound ECu(PNOAAP) (c2H5CI1)2(Cl04)~]2 was further synthesized and its black single crystals was obtained. The crystal structure of ligand and compound had been determined by X-ray diffraction method, and its spectroscopic properties had been studied by electron spectrum, IR, 1HNMR. PNOAAP has the molecular formula C~7H1~~NO~, Mr308. 34, and crystalized in orthorhombicspace group Pbcn, with unit cell parameters :a=1.3391(2)nm,b1.0259(2)nm, c=2. 2242(4) nm, V=3. 0556(9) nm3, Z8, Dc=l. 341Mg/rn3, ii 0. O9lmrrf', F (000) 1296, final R=0. 0407 and wR=0. 0830, S0. 831. compound crystals belongs to triclinicsystem, space group PT, with unit cell parameters: a1. 12310(17)nm, b=l. 12728 (17)nm, c1. 26820 (19), a =67. 902(3) , P =73. 530(3) , i' 73. 290(3) 0 , V1. 3967(4)~Z=2, Mr1325. 82, Dc=1. 576Mg/m~, ~ 4 040nm1, F(000)682, final R=0. 0653 and w R~0. 1678, S=0. 986. The structure of the compound is a dimer with oxide bridges(Py-N--0). The Cu(II) is in a distorted octahedral environment whose plane is constructed by 01,N3 and 02 of ligand and 0k3 of the ethanol. One of the apical positions is occupied by oxygen atom(04) of another ethanol group. Another site is linked to 0(2A) of ligand belonging to synmietry unit.By the reaction of 6-methyl-2-picolinaldehyde N-oxide and thiosemicarbazone in absolute ethanol in the molecular ratio of 1:1 ,6-methyl-2-picolinaldehyde N-oxide thiosemica was synthesized and its yellow single crystals was obtained. The crystal structure had been determined by X-ray diffl~acdon method and its spectroscopic properties had studied by electron spectrum, IR. Compound has the molecular formula C8H 10N40S H20 art] its crystal belongs to monoclinic system, space group Cc with unit cell parameters: a=13251(3)nm, b=2.4919(6)nm, c~12670(3)nrn, P =101.334(5) 0 ,V=4.4258(19)nm3,Z=16,Mr23029,Dc= I .382Mg/rn3, ~i 28Irnm1,F(000)=1952,final R=O.O468,wR~).1 128,F2=O.692. Six weak hydrogen bonds exit in the crystal of the compound which make net structure.Molybdenum(VI) complex with Schiff base derived from 2-picolinaldehyde N-oxide and Histidine was synthesized by one step method and characterized by elemental analysis, IR spectra and thermal analysis. The results showed that molvbdenum(VI) coordinated to the Schiff bases via 0(N-oxide pyridine), N(Schiff3base) and O(-COCF) donors and formed stable complex. Based on these results, the possibly reasonable structure of complexes was suggested. Biological activity tests of the Schiff base and complex evidenced that Schiff base could inhibit the sprout of green bean, while molybdenum(VI) complexes could promote it. These facts confirmed that Mo(Vl)was active centre.In order to compare N-0 bond with HCO bond , two single crystals were obtained. For the N atom is more electronegative than C atom, N-0 bond lengths are 0. 131- 0. 135nm,while C0 bond lengths are 0. 133-'O. l37nm.The reaction of N-oxide o-mercaptopyridine and (n-Bu4N)4[Mo~O~j in absolute methanol in the molar ratio of 2:1 gave the complex. At the same time of its colorless single crystal was obtained. The crystal structure had been determined by X-ray diffraction. Complex has the molecular formula C31l-L~Mo3N4O11S3, Mr= 1036. 73,and crystalized in monoclinic ,space group P21/n , with unit cell parameters :a1. 09288(l2)nm, b2. 8777 (3) nm, cl. 32425(14)nm, P =100. 035 ,4.1011 (8)r&, Z-4, Dc=l. 679Mg/rn3, ii Z1. ll4nmf1, F(000)2096, final R0. 0508 and wRO. 1691, S1. 147. Molybdenum atoms exit three complex environments.By the reaction of salicylal, aminoethanol and Mo02(acac)2 in absolute ethanol in the molecular ratio of 22:1, [Mo (0) (CqH~~NO:i) 1, was synthesized and its single ciystals was obtained. The crystai stnicture has been determined by X-ray diffiaction method and its crystai belongs to...
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