SYNTHESIS AND CHARACTERIZATION OF Co(Ⅱ) COMPLEX OF 14-MEMBERED HEXAAZA MACROCYCLIC LIGAND WITH AXIALLY COORDINATED BROMIDES

The macrocyclic ligand complex, [Co(C_(18)H_(18)N_6) Br_2]·1/2H_2O, has been synthesized by the template condensation of 2, 6-diacetylpyridine with hydrazine in the presence of cobalt (Ⅱ) dibromide and characterized by IR, ESR, electronic spectra and magnetic properties. Based on these data, the complex is proposed to be an approximate elongated octahedron with low spin state. The absorption bands of d-d transition are assigned, and the values of various ligand field parameters have been evaluated and are discussed in terms of their chemical utilities. ESR study on the complex has been carried out. The values of g(?)and g(?) have been determined. From ligand field parameter values and gvalues, μ_(eff)=2.06 BM has been obtained, which is consistent with the experimental value(2.04BM).     

SYNTHESIS AND CHARACTERIZATION OF A NOVEL DITOPIC LIGAND AND ITS HETEROMETALLO-BINUCLEAR COMPLEX

A ditopic ligand bpy-cyclam(L)and its heterometallo-binuclearcomplex Ru(bpy)_2(bpy-cyclam-Ni)(ClO_4)_43H_2O(3)designed for use in thecatalytic photoreduction of carbon dioxide have been newly synthesized andcharacterized.The protonation constants of L were also determined.     

SYNTHESIS AND CHARACTERIZATION OF A LINEAR μ-OXO DIIRON(III) COMPOUND AND A COPPER(II) NITRITE COMPLEX CONTAINING,A TRIPODAL POLYBENZIMIDAZOLE LIGAND

Abstract

Iron(III) and copper(II) complexes of the polybenzimidazole ligand, tris((benzimidazol-2-yl)methyl)amine (tmba) have been synthesized and structurally characterized. The mononuclear complex [Cu(tmba)(NO₂)]⁺[CH₃OH][NO^? ₂], 1, has been isolated and characterized by X-ray crystallography. The complex crystallizes in the triclinic space group P1 with two molecules in the unit cell of dimension a = 8.891(5), b = 11.775(6), and c = 13.702(8)Å, and α = 67.76(1), β = 71.79(2) and γ = 88.96(1)°, and volume = 1253.0(12)ų. The structure was refined to a final agreement factor R = 0.0901 using 4134 observed reflections. The complex consists of cationic copper(tmba) complex covalently bonded to a nitrite, and a pair of these cations is dibridged by a pair of nitrite anions. The gap between this dimer is occupied by a methanol molecule. The coordination environment around each copper can be described as trigonal bipyramidal, with the tertiary amine, a benzimidazole nitrogen and an oxygen from the nitrite providing the ligating atoms of the trigonal plane.

The μ-oxo bridged binuclear complex [Fe₂O(tmba)₂Cl₂](H₂O)(EtOH)₂·Cl₂, 2, was also characterized by single crystal X-ray diffraction and magnetic susceptibility. The complex crystallizes in the triclinic space group P1 with one molecule in the unit cell of dimensions, a = 11.5791(7), b = 13.3369(8), and c = 13.7002(9) Å, and α = 103.904(1), β = 108.903(2) and γ = 112.845(1)°, and volume = 1674.1(2) å³. The structure was refined to a final agreement factor R = 0.073 using 5597 observed reflections. The complex is a centrosymmetric dimer, with the two iron(III) atoms bridged by an oxygen atom, with an Fe—O—Fe angle of 180°, and a Fe—Fe distance of 3.61(1)Å. The coordination around each iron(III) is best described as octahedral, with the bridging oxygen trans to one end of the benzimidazole group, and a chlorine atom trans to the tertiary amine nitrogen of the ligand.     

SYNTHESIS AND CHARACTERIZATION OF POLY(STYRENE-co-4-VINYLPYRIDINE) NEODYMIUM COMPLEX

Poly(styrene-co-4-vinylpyridine)-neodymium complexes(NdCl_3·PS4VPY)with variouscontents of the functional group and neodymium have been prepared and characterized.Theinfrared and X-ray photoelectron spectra indicate that uncoordinated 4-vinylpyridine(4VPY)unitsremain in the NdCl_3·PS4VPY complexes.The catalytic behaviour of NdCl_3·PS4VPY was described briefly.     

SYNTHESIS AND CHARACTERIZATION OF HETEROAROMATIC POLYMERS CONTAINING PYRIDINE MOIETIES

1. INTRODUCTION The new kinds of heteroaromatic polymers have been important topics in polymer science fields since they were developed at 1960s in order to meet demands for heat-resistant plastics for space and military applications. Because heteroaromatic polymers exhibit excellent thermal and chemical stability, outstanding electrical and mechanical properties, good solvent resistance, and dimensional stability, these polymers have found usage as adhesives, coatings, matrix resins, film…     

SYNTHESIS AND CHARACTERIZATION OF SILAZANE OLIGOMER CONTAINING 1,1,3,3,5,5-HEXAMETHYLCYCLOTRISILAZANE

A new silazane oligomer containing cyclotrisilazane was synthesized by KH-catalyzed dehydro-coupling reactionsbetween diphenylsilane and 1,1,3,3,5,5-hexamethylcyclotrisilazane (D_3~N).     

SYNTHESIS OF A NEW JON PAIR COMPLEX CONTAINING MOLYBDENUM(V)AND SAMARIUM(Ⅲ)

ＳＹＮＴＨＥＳＩＳＯＦＡＮＥＷＪＯＮＰＡＩＲＣＯＭＰＬＥＸＣＯＮＴＡＩＮＩＮＧＭＯＬＹＢＤＥＮＵＭ（Ｖ）ＡＮＤＳＡＭＡＲＩＵＭ（Ⅲ）￥ＣｈｕｎＴｉｎｇＳＵＮ；ＹａＢｉｎＺＨＵ；ＱｉｎｇＨｏｎｇＦＵ；ＸｕｎＬＩＵ；ＳｈｕＺｈｅｎＹＩ（ＫｅｙＬａｂｏｒａ...     

A MODIFICATION OF THE SYNTHESIS OF MACROCYCLIC POLYAMINES CONTAINING PYRIDINE RING

ＡＭＯＤＩＦＩＣＡＴＩＯＮＯＦＴＨＥＳＹＮＴＨＥＳＩＳＯＦＭＡＣＲＯＣＹＣＬＩＣＰＯＬＹＡＭＩＮＥＳＣＯＮＴＡＩＮＩＮＧＰＹＲＩＤＩＮＥＲＩＮＧＧｕｏＰｉｎｇＸＵＥ；ＹｏｎｇＢｉｎｇＨＥ；ＣｈｅｎｇＴａｉＷＵ（ＤｅｐａｒｔｍｅｎｔｏｆＣｈｅｍｉｓｔｒ...     

SYNTHESIS AND CHARACTERIZATION OF PHENOTHIAZINE-BASED PPV-TYPE COPOLYMERS CONTAINING FLUORENE AND THIOPHENE MOIETIES

1. INTRODUCTION Since the first report of efficient polymer light emitting diode (PLED) in 1990, conjugated polymers have intrigued great interests because of substantial promise for electro-optical applications [1,2]. It is essential to develop novel str…     

SYNTHESIS AND CHARACTERIZATION OF COMPLEXES OF TRANSITION METAL WITH PBDETA, A NEW POLYDENTATE LIGAND

The synthesis and characterization are reported for a series of bi- and trinuclear complexes of the first transition metal ions with PBDETA, the newly syn thesized polydentate ligand. The electron transition energy in binuclear compound is stronger than that in trinuclear. There is a weak antiferromagnetic exchange interaction in tricopper and trimanganese.     

SYNTHESIS AND CHARACTERIZATION OF FOUR NOVEL TYPES OF MICROPOROUS BERYLLOPHOSPHATE(Ⅱ)

Four new types of microporous beryllophosphates werehydrothermally synthesized using BeO - P_2O_5- R - MCl (or MCl_2) - H_20, Rbeing HMDA (1, b-hexanediamine), EDA (ethylenediamine), or TBAOH(tetrabutytamine hydroxide), M alkali or alkali earth cation. By means ofX-ray diffraction patterns (XRD), infrared (IR), TG-DT and elemental analyseswe show that the crystalline beryllopbospbates have novel, unique frameworkstructures, composed from basic units of tetrahedral P0_4 and Be0_4. Thesematerials exhibit zeolite-like adsorption and ion-exchange properties.     

SYNTHESIS AND MAGNETISM OF BINUCLEAR COPPER(Ⅱ) COMPLEXES CONTAINING SALUCYLAMIDATOCUPRATE(Ⅱ)

New binuclear copper(Ⅱ) complexes, [Cu(samen)Cu(NO_2-phen)]·H_2O and [Cu(sampn)-Cu(NO_2-phen)]·2H_2O have been synthesized, where samen~(4-), sampn~(4-) and NO_2-phen denote N, N′-ethylenedisalicylamidate anion, N, N′-1, 2-propanedisalicylamidate anion and 5-nitro-1, 10-phenanthroline respectively. 3ased on IR, elemental analyses and electronic spectra, the complexes are proposed to have a phenoxy-bridged structure and to consist of the Cu(Ⅱ)ion in distorted planar environment. The complexes have been characterized with varlable-temperature magnetic susceptibility (4—300 K) and the observed data were fit to those from a modified Bleaney-Bowers equation by least-squares method, giving the exchange integral J=-63.0 cm~(-1) (samen) and J=-46.5cm~(-1) (sampn). This indicates the existence of antiferromagnetic spin exchange interaction among the metal ions.     

SYNTHESIS AND CHARACTERIZATION OF A NEW POLYSILOXANE CONTAINING N,N’-BIS(DIPHENYLSILYL)TETRAPHENYLCYCLODISILAZANE

A new kind of polysiloxane containing N,N'-bis(diphenylsilyl)tetraphenylcyclodisilazane was prepared by anionicnon-equilibrium polymerization with a "seed solution" as initiator. The monomer, N,N'-bis(hydroxydiphenylsilyl)-tetraphenyl-cyclodisilazane (BHPTPC), was synthesized via the hydrolysis of N,N'-bis(chlorodiphenylsilyl)tetraphenyl-cyclodisilazane (BCPTPC). A new method for the preparation of BCPTPC is also reported here with high yield and simplermanipulation. The synthesized polysiloxane containing N,N'-bis(diphenylsilyl)tetraphenylcyclodisilazane was characterized by ~1H-NMR, ~(29)Si-NMR, gel permeation chromatography (GPC) and intrinsic viscosity.     

A NOVEL MACROCYCLIC SCHIFF BASE AND ITS METAL COMPLEXES：SYNTHESIS AND CHARACTERIZATION

Ａ　ＮＯＶＥＬ　ＭＡＣＲＯＣＹＣＬＩＣ　ＳＣＨＩＦＦ　ＢＡＳＥ　ＡＮＤ　ＩＴＳ　ＭＥＴＡＬ　ＣＯＭＰＬＥＸＥＳ：ＳＹＮＴＨＥＳＩＳ　ＡＮＤ　ＣＨＡＲＡＣＴＥＲＩＺＡＴＩＯＮＬｉａｎｇＺＨＡＯ；ＪｉａｎＨｏｎｇＢＩ；ＺｈｉＱｉａｎｇＸｕ；ＦｕＸｉｎＸＩ...     

SYNTHESIS, CHARACTERIZATION AND CATALYTIC ACTIVITY OF N,N''''-BIS(3-ALLYL SALICYLIDENE)ETHYLENEDIAMINE COBALT(Ⅱ) SCHIFF BASE COMPLEX ANCHORED ON A NEW POLYMER SUPPORT

INTRODUCTIONAlthough homogeneous catalysts have higher selectivity and act under mild experimental conditions in variousreactions they have problems of separation and recovery from reaction products. Hence current research activitiesare aimed at developing catalysts of coordination compounds anchored on suitable supports[1,2]. This techniqueof immobilization of catalyst on an inert support increases the catalytic activity, selectivity, efficiency[3],operational flexibility and stability. …     

SYNTHESIS AND CHARACTERIZATION OF POLYBENZOTHIAZOLAMIDES

Aromatic polybenzothiazolamides were prepared by low temperature solution method by condensing the 2, 2'-diarnino-6, 6'-bibenzothiazole with four different acid chlorides in quantitative yield. These polymers were characterized by IR and NMR. Viscosities of these polyamides range from 0.42 to 1 dl/gm. All these polymers were stable upto 300℃in air.     

SYNTHESIS AND CHARACTERIZATION OF THERMOTROPIC COPOLYESTERS AND COPOLY (ESTER-AMIDE)S CONTAINING OXYETHYLENE-ETHER AS THE SPACER

Flexible oxyethylene-ether was introduced into the aromatic copolyesters and copoly(es-ter-amide)s to reduce the melting point of resulting polymers. The melting point was greatlyreduced to 200℃ or even lower in some cases, and the molecular weight was satisfactorilyhigh as reflected by inherent viscosity. The polymers exhibited high thermal stability and goodmechanical properties as determined by TGA and mechanical tests. The copolyester showedbetter crystallinity and liquid crystallinity than corresponding copoly(ester-amide)s with simi-lar monomer composition as reflected by POM observation and WAXD study. The meltingpoints for both copolyesters and copoly (ester-amide)s showed great dependence on the p-acetoxybenzoic acid (PAB) content in monomer composition and reached the lowest valuewhen PAB was 29 mol%.     

THE SYNTHESIS AND CHARACTERIZATION OF A NOVELMIXED-VALENCE ISOPOLYVANADATE

ＴＨＥＳＹＮＴＨＥＳＩＳＡＮＤＣＨＡＲＡＣＴＥＲＩＺＡＴＩＯＮＯＦＡＮＯＶＥＬ　ＭＩＸＥＤ－ＶＡＬＥＮＣＥＩＳＯＰＯＬＹＶＡＮＡＤＡＴＥＪｉａＮｉｎｇＸＵ；ＧｕｏＹｕＹＡＮＧ；ＷｅｎＹｉｎｇＭＡ；ＺｈｉＺｈｏｎｇＳｕｎ；ＪｉＱｉｎｇＸＵ（Ｄｅｐａｒｔ...     

SYNTHESIS AND STRUCTURE OF A NOVEL INFINITE-LAYER COPPER(Ⅱ)COMPLEX BRIDGED BY OXAMIDE AND PYRIMIDINE

The complex polymer[Cu_2(oxap)(pyr)_2]_n(ClO_4)_(2n),where oxap~(2-)stands for N,N'-bis(2—aminopropyl)oxamide,have been synthesized.It crystallizes in monoclinic system,space group P2_1/C,with a=8.721(2),b=8.679(2),c=16.741(2),β=98.59(0),Z=4.Theleast-square refinement coverged at R=0.054,R_w=0.055 with 1869 unique reflections.Thewhole structure of the complcx consists of layers of two-dimensional network arrayingalong a-axis with perchlorate ions interspersed in the gap between layers.Inside the layer.trans-oxamide-bridged copper(Ⅱ)dimers connected by pyrimidine in an asymmetric fashionspread out along be plane to form an infinite two-dimensional network.     

SYNTHESIS AND CHARACTERIZATION OF AMINO－ACID SCHIFF BASE AND ITS GERMANIUM COMPLEX

ＳＹＮＴＨＥＳＩＳＡＮＤＣＨＡＲＡＣＴＥＲＩＺＡＴＩＯＮＯＦＡＭＩＮＯ－ＡＣＩＤＳＣＨＩＦＦＢＡＳＥＡＮＤＩＴＳＧＥＲＭＡＮＩＵＭＣＯＭＰＬＥＸ￥ＤｏｎｇＭａＩＣＡＩ；ＷｕＪｕＬＩ；ＬｉｎＹＡＮＧ；ＱｕａｎＬｉｎｇ；ＺａｎＳＨＩ；（Ｄｅｐａｒｔｍｅｎ...