Iron (II) Complex of Benzylpenicillin,Synthesis and Infrared Structural Characterisation

Synthesis and IR spectrum of iron (II), benzylpenicillin complexe are reported. The alterations observed between the ligand and iron complexe IR spectra allow us to specify the coordination modes. The benzylpenicillin is bounded to iron through carboxylate group and thazolidinic nitrogen.     

锰、铁、钴氮杂金属冠醚的红外和紫外光谱研究

本文报导了含铁、钴、锰氮杂金属冠醚及其配体的红外和紫外光谱研究结果。对400－4000cm^-1范围的主要红外吸收谱峰进行了经验归属，并进一步讨论了合成的配体和配合物的特征吸收谱带与其结构的关系。配体IR谱中的v(C=O),v(NH),δ（NH） v(CN),δ（NH）等酮式特征吸收在配合物的IR谱图中基本消失，－1600cm^-1处出现归属于共轭体系C＝N－N＝C骨架伸缩振动的吸收谱带，－1560和－1410cm^-1附近各出现一尖锐的强吸收，他们分别归属于v(C=O)和v(CO)，说明该系列N－烷酰基水杨酰肼配体固态时主要以酮式存在，在溶液中则先异构为烯醇式结构，然后醇羟基再通过去质子化作用使羟氧与金属配合。电子光谱研究结果表明该系列配合物出现苯环及共轭体系的π-π^*或n-π^*的跃迁（－204和220－256nm)、M－L荷移跃迁带（274－350nm)和在配位体场作用下金属原子的d-d跃迁吸收峰（－500nm)。     

Synthesis,Spectroscopic and Antimicrobial Studies of Lead (II) Complexes of Schiff Bases Derived From Amino Acids and Isatins

A new series of lead (II) complexes have been synthesized with Schiff bases derived from isatins and amino acids. These ligands act as bidentate species and coordinate to the metal atom through the azomethine nitrogen and carboxylate oxygen atom via deprotonation. The synthesized complexes have been characterized by elemental analysis, conductance measurements, and molecular weight determinations. The mode of bonding of the complexes has been suggested on the basis of infrared, UV-visible, and ¹H- and ¹³C-NMR spectroscopy, and probable structures have been assigned to these complexes. Few representative ligands and metal complexes have also been screened for their antifungal and antibacterial activities. Molecular modeling and analysis for bond lengths and bond angles have also been carried out for one of the representative compound, [Pb(L³)₂], to substantiate the proposed structures.     

THE SYNTHESIS AND SPECTRAL CHARACTERIZATION OF NEW Cu(II), Ni(II), Co(III), AND Zn(II) COMPLEXES WITH SCHIFF BASE

ABSTRACT

Cu(II), Ni(II), Co(III) and Zn(II) complexes with Schiff base have been prepared. Ligand is derived from condensation of 1,2-bis(p>-aminophenoxy)ethane and 2- hydroxynaphthalin-1-carbaldehyde. The complexes have been characterized by elemental analyses, Λ_M, IR, UV-VIS, ¹H NMR, ¹³C NMR and magnetic measurements. The ligand is coordinated to the central metal as a tetradentade ONNO ligand. The four bonding sites are the azomethine nitrogen and aldehydic -OH groups.     

Ni（Ⅱ）,Cu（Ⅱ）,Zn（Ⅱ）的硝酸盐与氟哌酸的固态配合物的 …

由氟哌酸与Ｎｉ（Ⅱ）、Ｃｕ（Ⅱ）、Ｚｎ（Ⅱ）的硝酸盐合成了三个未见报道的固态配合物,并用元素分析、摩尔电导、红外光谱、热重分析表征了它们的组成和性质。     

肽—银（Ⅰ）相互作用的NMR研究

用ＮＭＲ谱研究了银（Ⅰ）离子与肽－Ｇｌｙ－Ｇｌｙ、Ｇｌｙ－Ｇｌｙ－Ｇｌｙ、Ｇｌｙ－Ｌｅｕ、Ｇｌｙ－Ｔｙｒ、Ｎ－Ａｃｅ－Ｇｌｙ的相互作用。在所研究和配合物中,肽是螯合配体,其配位原子包括羧基的Ｏ原子和氨基的Ｎ原子。结果表明,氨基和羧基和Ａｇ（Ⅰ）离子的相互作用是有利的,将决定肽的取向和构象。     

新型三元配合物Tb(DPAB)_3IP的制备与发光性能

合成了邻菲罗啉的衍生物咪唑并[5,6-f]邻菲罗啉(IP),并以其为第二配体,二苯胺羰基邻苯甲酸(HDPAB)为第一配体,制备出新型稀土铽三元有机配合物Tb(DPAB)3IP。采用元素分析、红外光谱和紫外光谱对合成的配体及配合物进行了表征。通过荧光光谱研究了配合物的荧光性质,结果表明第二配体IP有较大的共轭体系,在紫外光激发下,配合物中的配体可将吸收的能量传递给稀土Tb3+离子,表现出较强的Tb3+离子的特征发射,且配体Tb(DPAB)3IP的荧光强度明显大于Tb(DPAB)3phen的荧光强度。这说明适宜的第二配体对配合物有很好的敏化发光作用,合成的Tb(DPAB)3IP是一种良好的绿光材料。     

配合物Zn3(NCS)6(L1)6(NO3)2及Ni3(NCS)6(L2)6(NO3)2的合成、光谱表征及荧光性质

以去离子水为溶剂,合成了以Zn2+及N12+为中心,以L1,L2[L1=4-氨基-3,5-二甲基-1,2,4-三唑,L2=4-氨基-1,2,4-三唑]及硫氰酸根为配体的两种配合物,对其进行了元素分析、金属离子络合滴定、摩尔电导测定,确定了配合物组成分别为Zn3(NCS)6(L1)6(NO3)2及Ni3(NCS)6(L2)6(NO3)2,同时对两种配合物做了红外光谱、紫外光谱及荧光光谱的测试表征.荧光光谱的测试表明两种配合物均在415 nm有一强的荧光发射峰,且镍配合物的荧光要明显强于锌配合物,两种配合物有望成为蓝光发光材料.     

The Infrared and 1H-NMR Spectra of 8-Hydroxyquinoline Adducts of 8-Hydroxyquinoline Complexes of Dioxouranium(VI), Thorium(IV) and Scandium(III)

The ¹H-nmr and infrared spectra of the complexes [M(ox)_n(Hox)] where M = UO₂ (n = 2), Th (n = 4) or Sc (n = 3) and Hox = 8-hydroxyquinoline are discussed. The nmr spectra of the adducts are uninformative with respect to the bonding and structure of these molecules since they dissociate in solution. The solid state ir spectra show that the adducted molecule of 8-hydroxyquinoline is bound to the metal through the phenolic oxygen, the proton forming an intramolecular hydrogen bond between the nitrogen atom of the adducted molecule and the oxygen atom of a neighbouring chelate ring. The mid-and far-ir spectra are reported for the first time and assignments for the δN-H, νM-O and νM-N modes have been made.     

“Vibrational Spectra of Tetrapropylammonium Trichlorozincate (II)”

The IR and Raman spectra of Crystalline Tetrapropylammonium trichlorozincate (II) have been measured at room and liquid nitrogen temperatures. The spectra have been interpreted in terms of halogen bridged structures. The complete coincidence of the IR and Raman bands suggests a symmetry lower than D_2h and rules out any centrosymmetric structure.     

Cu(Ⅱ)及Zn(Ⅱ)与直链醚席夫碱配合物的合成与表征

合成了两种直链醚席夫碱双水杨醛缩二甘醇二胺(SALDA)和双水杨醛缩四甘醇二胺(SALTTA)及其新配合物[Zn(SALDA)](NO₃)₂·4H₂O和[Cu₃(SALTTA)(NO₃)₄](NO₃)₂·3H₂O.并以IR谱、UV谱,特别是¹H和¹³C NMR谱等方法进行了表征,并详细地讨论了合成方法,IR谱表明SALTTA中醚氧并未全部配位.     

Synthesis, characterization and luminescence properties of novel beta-diketone and Eu(III) ternary complex

The novel beta-diketone 1-(4-bromophenyl)-3-phenylpropane-1, 3-dione (L) was synthesized at room temperature by classical Claisen condensation reaction. With the beta-diketone L as the first ligand and phen as the secondary ligand, and a new rare-earth Eu (III) ternary complex was prepared. The ligand L and ternary complex were characterized by elemental analysis, IR spectra, UV spectra and fluorescence spectra. IR spectra indicated that: the novel ligand L contained the structure of beta-diketone, where the content of enol was high; the Eu3+ ion in the ternary complex was coordinated with six oxygen atoms of three L ligands and two nitrogen atoms of the second ligand phen. UV spectra showed that the main absorption was from the first ligand L in the Eu (III) ternary complex. The excitation and emission spectra of the ternary complex were measured and investigated. Fluorescence spectra demonstrated that the ternary complex could emit characteristic fluorescence of rare earth Eu3+ ion and the strongest emission band was narrow which was attributed to the 5 D0 --> 7 F2 transitions of the 4f electrons of the central Eu3+ ions. So, the new Eu(III) ternary complex is an excellent red-emitter which would be regarded as a valuable material with bright red fluorescence because it presents good monochromaticity.     

Vibrational Spectra of Benzylidene Aniline,O-Hydroxybenzylidene O-Hydroxyaniline and its Complexes with Cu(II) and NI(II) Metal Ions

Abstract

The FTIR and FT Raman spectra of benzylidene aniline, and o-hydroxybenzylidene o-hydroxyaniline compounds in the solid state in the wavenumber (1800-200 cm^?1) are recorded. An assignment for nearly all fundamentals are proposed. Comparison of the spectra of trans stilbene and benzylidene aniline reveals that v N-Ph stretch for the latter compound is situated at 1368 cm^?1 in the IR spectra with medium intensity. for o-hydroxybenzylidene o-hydroxyaniline, the stretching modes v N-Ph, and v C-Ph are observed at 1356 and 1226 cm^?1 respectively. the two v O-Ph are observed as intense bands in the IR spectra at 1245 and 1278 cm^?1, respectively. the FTIR spectra of the o-hydroxybenzylidene o-hydroxyaniline complexes with Cu(II) and Ni(II) metal ions are also recorded and assigned.     

A 1H NMR Study of Palladium(II) Coordination Compounds with 2-Aminooxypropanoic Acid and Its Methyl Ester

The ¹H NMR spectra of 2-aminooxypropanoic acid, its methyl ester and their hydrochlorides have been inspected. The interaction of these ligands with palladium(II) has been investigated in deuterium oxide and in dimethyl sulfoxide. The metal has been found to form a chelate with the acid, whereas its esters coordinated to the metal through the nitrogen atom of the aminooxy group only. In dimethyl sulfoxide, also the methyl esters and hydrochlorides of 2-aminooxybutanoic, 2-aminooxy-3-methylpentanoic,as well as the ester of 2-aminooxyhexanoic and the hydrochoride of the ester of 2-aminooxy-3-phenylpropanoic acid have been studied.     

Negative‐Imaging of Citrate Layers on Gold Nanoparticles by Ligand‐Templated Metal Deposition: Revealing Surface Heterogeneity

Surface heterogeneity of a metal nanoparticle is typically regarded as boundary defects and various crystalline facets. While organic capping ligands of a single type are assumed to be homogeneously distributed on the nanoparticle surface, heterogeneous surface coverage of citrate molecules on individual facets of gold nanoparticles (AuNPs) is revealed. Pt metallic clusters with 2 nm in diameter, epitaxially grown on the surface of AuNPs by chemical reaction and imaged by high‐resolution transmission electron microscopy, are utilized as negative‐imaging probes for densely packed adlayers where the underneath gold surface may not be accessible for Pt deposition. At pH > 5.0, citrate anions form only a loosely packed layer. At pH 4.5, citrates and citric acids form both loosely packed and densely packed layers that appear phase separated, and the densely packed domain as small as 5 nm × 5 nm is likely composed of fully protonated citric acids. IR spectra indicate that citric acid binds to a surface Au adatom through the oxygen atom of the central hydroxyl group, and similarly, citrate anions bind to Au adatoms through the carboxylate oxygen atom. This study also reveals the role of Au adatom in the adsorption of citrate species on the metallic surface of AuNPs.     

Molecular Spectral Analysis and Ab Initio Calculations of bis(3-aminopyridinium) Tetrachlorocuprate (II), 3-Ammoniumpyridinium Tetrachlorocuprate (II), and bis(3-aminopyridinium) Hexachlorodicuprate (II)

The aromatic character, distortion, and stabilization as a result of single and double protonation of 3-aminopyridine like three different complex salts were studied by infrared-, ultraviolet spectral analysis, proton nuclear magnetic resonance, and quantum chemical ab initio calculations. Linear-dichroic infrared spectroscopy was applied for identification of the infrared bands. The correlation structure-spectroscopic properties of the model systems are determined: bis(3-aminopyridinium) tetrachlorocuprate (II) salt, where the ring nitrogen atom participates in protonation; 3-ammoniumpyridinium tetrachlorocuprate (II) salt, where both nitrogen atoms are protonated; and a complex with copper (II) bis(3-aminopyridinium) hexachlorodicuprate (II), where the metal ion is coordinated through amino group.     

Structural, vibrational, thermal and magnetic investigation of novel Co(II), Cu(II), Zn(II) and Hg(II) crystalline metal complexes with 2-amino-5-benzylmercapto-1,3,4-thiadiazole: a low weight model of protonated copolymer resin

The 2-amino-5-benzylmercapto-1,3,4-thiadiazole (C₉H₉N₃S₂) is a low weight model of a protonated copolymer resin used as a metal uptake agent. New monomeric crystalline metal complexes of C₉H₉N₃S₂ with Co(II), Cu(II), Zn(II) and Hg(II) were synthesized and investigated in order to facilitate the interpretation of the metal/resin binding mode. These materials have been studied by single crystal X-ray Diffraction and FTIR Spectroscopy at room temperature. Crystal data for these triclinic phases are reported. All frameworks consist of discrete monomeric units that provide crystalline stability through a network of hydrogen bond interactions. The Co(II), Zn(II) and Hg(II) ions are surrounded by a tetrahedral arrangement of two thioether monodentate ligands (each one coordinating by a N(1)_thiadiazole atom) and two chlorine atoms. The Cu(II) ion is coordinated by four thioether monodentate ligands (each one coordinating by a N(1)_thiadiazole atom) and one chlorine atom as nearest neighbor in a distorted square pyramidal polyhedron. The spectroscopic data are consistent with the structural model. FTIR spectra evidence changes in the H-bonds in the crystal packing when coordination with these divalent ions is present. Magnetic susceptibility at room temperature for Cu(II) and Co(II) complexes, EPR spectrum at room temperature for Cu(II) complex and thermal properties for all complexes were measured. These results could be useful for the interpretation of the binding mode of M(II)/1,3,4-thiadiazole-2-amino-5-thiol in protonated copolymer resin which are used as uptake agents of toxic metallic ions.     

An Infrared Spectroscopic Study of Crystalline Copper (II) Propionate and Butyrate

Abstract

Abstract: The vibrational spectra of crystalline anhydrous copper (II) propionate and butyrate were studied by FT-IR spectroscopy. A detailed assignment of the spectra of both compounds is presented and discussed. It is shown that the presence of two non-equivalent sets of carboxylate ligands within the crystals gives rise to several band splittings, which are particularly evident in those bands ascribable to normal modes involving predominantly the -C_βH₃ or -C_βH₂-fragments. In addition, the vibrational assignments made for the studied molecules are shown to be very useful to help understanding the much more complex spectra of long chain copper carboxylates.     

银(Ⅰ)、镉(Ⅱ)4-巯基吡啶配合物的光谱研究

采用常规溶液反应蒸发法以4-巯基吡啶(简写为4-MPy)为有机配体与银、镉的硝酸盐合成了两种金属有机配合物。并利用红外、拉曼、紫外-可见光谱技术对4-MPy及合成的配位化合物进行了研究,对主要红外和拉曼谱带进行了经验归属,并进一步讨论了配体和配合物的特征吸收谱带与配合物结构间的关系。在红外光谱中,配体在1 459cm-1处的吸收峰归属为CC和CN复合振动峰,形成配合物后在两种配合物中,此吸收峰分别向高波数位移至1 464和1 464cm-1。在拉曼光谱中,两种有机配位化合物在1 004和1 008cm-1处归属为环呼吸振动峰、在1 617和1 615cm-1处归属为环伸缩振动峰、在720和720cm-1处归属为β(C—C)和ν(C—S)的复合振动峰,各自十分相似。     

铕镧苯甲酸α,α′-联吡啶配合物的合成及性质研究

在乙醇介质中合成了以Eu3+ 和La3+ 为中心体、苯甲酸和α ,α′ 联吡啶为配体的混合稀土配合物。测定了配合物的组成、研究了其紫外光谱和红外光谱。结果表明 ,配合物的组成为EuxLa1 -x(Dipy)L3·H2 O ,苯甲酸和α ,α′ 联吡啶的紫外吸收峰在配合物中分别位移了 2～ 9nm ;苯甲酸根羧基的反对称伸缩振动和对称伸缩振动在配合物中向低波数移动 ,而α ,α′ 联吡啶的CN振动则向高波数移动。这些事实表明 ,苯甲酸和α ,α′ 联吡啶与稀土离子配位。荧光测试表明 ,用不发光的镧离子取代该系列配合物中部分铕离子 ,在一定范围内 ,可以提高三价铕的特征荧光发射强度。这一结果也表明 ,在该系列配合物中 ,不仅配体可以将吸收的能量传递给发光的铕离子 ,使其发光 ,而且不发光的镧配合物也可将其吸收的能量通过分子内能量传递给铕离子 ,增强铕的发光强度。