摘要：
A new ligand (L), 6-mono-(2-(2-hydroxy-3-(hydroxymethyl)-5-methyl benzylamino)-ethylamino)-β-cyclodextrin, based on β-cyclodextrin derivatives with dinucleating units was synthesized and used to prepare a trimetallic bis-ligands zinc complex (Zn3(L2−)2). The esterase activity of the complex was investigated by the hydrolysis of two carboxylic acid esters, bis(4-nitrophenyl)carbonate (BNPC) and 4-nitrophenyl acetate (NA), and a DNA model bis(4-nitrophenyl)phosphate (BNPP) as a phosphate ester. The catalytic rate for BNPC was very high, which was found to be a 5.63 × 103-fold rate enhancement over uncatalyzed hydrolysis and 1.62 × 102-fold rate enhancement over uncatalyzed hydrolysis for NA hydrolysis at pH = 7.0. For the catalytic hydrolysis of BNPP, the initial first-order rate constant of 0.1 mM catalyst was 5.85 × 10−8 s−1 at pH = 8.50 and 35 °C, which is a 731-fold acceleration over uncatalyzed hydrolysis. The second rate constant (kBNPP) was found to be 1.22 × 10−3 M−1 s−1 at pH = 10.0. According to the potentiometric titration study, the zinc complex exists in a dinuclear single ligand coordinated mode and a trinuclear bis-ligands system at pH ≥ 7.0. The ester hydrolysis activity was attributed to the cooperative interaction of the two metal centers and the hydrophobic cavity of β-cyclodextrin with substrates.Graphical abstractA new ligand (L) with dinucleating units based on β-cyclodextrin was synthesized. Its trimetallic bis-cyclodextrins zinc complex (Zn3(L2−)2) was demonstrated as a potent catalyst for ester hydrolysis.View high quality image (115K)Research highlights▶ Trinuclear zinc complex based β-cyclodextrins catalyzed ester hydrolysis. The complex displayed good hydrolytic activities for monoester and diesters. The cooperation of metal centers and β-cyclodextrin was important for ester cleavage.
摘要：
The title complex, [FeZn(C 5H 5)Cl 2(C 20H 14N 3)]·CH 3CN, is composed of one Zn II atom, one 4′-ferrocenyl-2,2′:6′, 2′′-terpyridine (fctpy) ligand, two Cl atoms and one acetonitrile solvent molecule. The Zn II atom is five-coordinated in a trigonal-bipyramidal geometry by the tridentate chelating fctpy ligand and two Cl atoms.
作者机构：
[刘生桂; 潘荣楷; 郭锦媛] School of Chemistry Science and Technology, Zhanjiang Normal University, Development Center Far New Materials Engineering and Technology in Universities of Guangdong, Zhanjiang 524048, China;[唐斯萍] Department of Chemistry and Materials Science, Hengyang Normal University, Hengyang 421008, China
通讯机构：
[Liu, S.-G.] S;School of Chemistry Science and Technology, Zhanjiang Normal University, Development Center Far New Materials Engineering and Technology in Universities of Guangdong, China
通讯机构：
[Tang, Si-Ping] H;Hengyang Normal Univ, Key Lab Funct Organometall Mat, Hengyang 421008, Hunan, Peoples R China.
摘要：
The title complex, [CuFe(C(5)H(5))(C(20)H(14)N(3))(C(12)H(8)N(2))](ClO(4))(2).C(2)H(3)N, consists of a mononuclear [Cu(C(12)H(8)N(2))(C(25)H(19)FeN(3))](2+) cation, two ClO(4) (-) anions (one of which is disordered over two positions with equal occupancy) and one CH(3)CN solvent mol-ecule. The Cu(II) center has a distorted square-pyramidal coordination with three N atoms of the 4'-ferrocenyl-2,2':6',2''- terpyridine (fctpy) ligand and one 1,10-phenanthroline (phen) N atom in the basal plane and a second phen N atom in the apical position with an axial distance of 2.254 (4) A. The disordered ClO(4) (-) anion is weakly coordin-ated to the Cu(II) ion with a Cu-O distance of 2.766 (11) A. The two cyclo-penta-dienyl rings of the ferrocenyl group are almost eclipsed with a deviation of 4.7 (1) degrees , and are involved in inter-molecular pi-pi inter-actions with the outer pyridyl rings of the fctpy ligands [centroid-centroid distance = 3.759 (2) A.].
作者机构：
[Tang, Si-Ping] Hengyang Normal Univ, Dept Chem & Mat Sci, Hengyang 421008, Hunan, Peoples R China.
通讯机构：
[Tang, Si-Ping] H;Hengyang Normal Univ, Dept Chem & Mat Sci, Hengyang 421008, Hunan, Peoples R China.
摘要：
The title compound, C13H13N3, is non-planar, with the pyridine and phenyl rings inclined at an angle of 80.7 (3)°. The central ethyl-idenehydrazine atoms lie in a plane [mean deviation = 0.013 (1) Å], which forms dihedral angles of 88.5 (1) and 9.4 (1)° with the pyridine and phenyl rings, respectively. In the crystal structure, mol-ecules are linked by inter-molecular N - H⋯N hydrogen bonds into infinite chains propagating along the b axis.
通讯机构：
[Tang, Si-Ping] H;Hengyang Normal Univ, Key Lab Funct Organometall Mat, Hengyang 421008, Hunan, Peoples R China.
摘要：
In the title compound, C26H23N, the complete molecule is generated by crystallographic mirror symmetry, with the N atom and four C atoms lying on the reflection plane. The dihedral angles between the pyridine ring and pendant benzene rings are 2.9 (1), 14.1 (1) and 14.1 (1)°. Neighbouring mol-ecules are stabilized through inter-molecular π-π inter-actions along the c axis [centroid-to-centroid distance = 3.804 (2) Å], forming one-dimensional chains.
作者机构：
[Tang, Si-Ping] Hengyang Normal Univ, Dept Chem & Mat Sci, Hengyang 421008, Hunan, Peoples R China.
通讯机构：
[Tang, Si-Ping] H;Hengyang Normal Univ, Dept Chem & Mat Sci, Hengyang 421008, Hunan, Peoples R China.
摘要：
In the title compound, [Co(C6H5N2O4)2(H2O)2]·2C3H7NO, the Co II ion lies on an inversion center and adopts a slightly distorted CoN2O4 octa-hedral geometry binding two bidentate chelating 5-carb-oxy-2-methyl- 1H-imidazole-4-carboxyl-ate (H2MIDA-) monoanionic ligands and two axial aqua ligands. In the crystal structure, inter-molecular O - H⋯O hydrogen bonds link neighboring mol-ecules, generating a two-dimensional framework containing eight-membered H4O4 rings. In addition, the dimethyl-formamide solvent mol-ecules are hydrogen bonded to the two-dimensional framework via the NH groups of the H2MIDA- ligands.
摘要：
Two new copper(II) complexes with aminothioether ligands, [Cu(L-1)(ClO4)](ClO4) center dot 0.5H(2)O (1) and [Cu(L-2)(H2O)](ClO4)(2) center dot H2O (2) (L-1 = 2-benzyl-1,3-bis(aminoethylthio)propane and L? = 2-(4-butylbenzyl)-1,3-bis(aminoethylthio)propane), have been synthesized and characterized. The single crystal X-ray diffraction analysis reveals that both I and 2 adopt distorted square pyramidal geometries. The binding modes of both complexes with calf thymus DNA were investigated by UV-Vis and CD spectroscopies. The results show that both complexes mainly adopt an electrostatic attraction binding mode with DNA and the binding constants are (1.62 +/- 0.02) x 10(3) and (2.02 +/- 0.02) x 10(3) M-1, respectively. Both complexes are able to cleave pBR322 plasmid DNA efficiently in the presence of ascorbic acid and the activity of 2 is higher than that of 1. The DNA cleavage by I and 2 were inhibited strongly in the presence of DMSO and tert-butyl alcohol, which suggests that hydroxyl radicals are the reactive oxygen species for the cleavage. (C) 2008 Elsevier Ltd. All rights reserved.
通讯机构：
[Tang, Si-Ping] H;Hengyang Normal Univ, Key Lab Funct Organometall Mat, Hengyang 421008, Hunan, Peoples R China.
摘要：
In the title complex, [FeZn(C5H5)(C 20H14N3)(C12H8N 2)](ClO4)2·CH3CN, the Zn II atom is five-coordinated by a tridentate chelating 4′-ferrocenyl-2,2′:6′,2′′-terpyridine (fctpy) ligand and a bidentate chelating 1,10-phenanthroline (phen) ligand in a distorted square-pyramidal environment with a phen N atom located at the apical position [Zn - N = 2.259 (4) Å]. The terpyridyl motif in each fctpy ligand is coplanar, but the cyclo-penta-dienyl ring is twisted by 9.5 (2)° out of coplanarity with each central pyridine. The two cyclo-penta-dienyl rings of the ferrocenyl group are almost eclipsed with a deviation of 4.5 (1)°. In addition, inter-molecular π-π inter-actions [centroid-centroid distance 3.753 (2) Å] are present between the cyclo-penta-dienyl and outer pyridyl rings of the fctpy ligands. One of the perchlorate anions is equally disordered over two positions.
作者机构：
[Chen, Zhi-Min; Tang, Si-Ping; Kuang, Dai-Zhi; Feng, Yong-Lan; Li, Wei] Hengyang Normal Univ, Dept Chem & Mat Sci, Hunan 421008, Peoples R China.
通讯机构：
[Tang, Si-Ping] H;Hengyang Normal Univ, Dept Chem & Mat Sci, Hunan 421008, Peoples R China.
摘要：
The molecule of the title compound, C15H16N2O, is non-planar with a dihedral angle of 16.0 (1)° between the pyrrole and benzene rings. The ketone double-bond displays an s-cis conformation with an O=C - C=C torsion angle of 7.9 (3) and an intramolecular C - H⋯O hydrogen bond. In the crystal structure, adjacent mol-ecules are paired through N - H⋯O hydrogen bonds into centrosymmetric dimers.
作者机构：
[Deng Yi-Fang; Chen Man-Sheng; Kuang Dai-Zhi; Zhang Chun-Hua; Tang Si-Ping] Hengyang Normal Univ, Dept Chem & Mat Sci, Hengyang 421008, Hunan, Peoples R China.
通讯机构：
[Zhang Chun-Hua] H;Hengyang Normal Univ, Dept Chem & Mat Sci, Hengyang 421008, Hunan, Peoples R China.
关键词：
锰配合物;晶体结构;6-二氯苯甲酸;水热合成
摘要：
A dinuclear manganese(II) complex, [Mn-2(L-1)(2)(phen)(4)]center dot(ClO4)(2) (1), has been synthesized and structurally characterized (HL1=2,6-dichlorobenzoic acid, phen=1,10-phenanthroline). It crystallizes in triclinic system, space group P1 with a=1.1123(4) nm, b=1.378 2(4) nm, c=2.085 7(3) nm, alpha=93.768(2)degrees, beta=90.606(10)degrees, gamma=95.606(3)degrees, V=3.174 8(15) nm(3), Z=2, C62H38Cl6Mn2N8O12, M-r=1 409.58, D-c=1.475 g.cm(-3), mu=0.718 mm(-1), F(000)=1 428, R= 0.064 3, wR =0.138 3. In the crystal the manganese atom is six-coordinated by two oxygen atoms from two different 2,6-dichlorobenzolate molecules and four nitrogen atoms from two 1,10-phenanthroline molecules, completing an octahedral geometry.
摘要：
A cadmium complex [Cd(cinnamato) 2(Phen)] 2 was synthesized by the reaction of cinnamic acid, phenanthroline (phen), and Cd(ClO 4) 2·6H 2O. It crystallizes in triclinic, space group P1, with a=1.142 1(13) nm, b=1.1576(13) nm, c=2.106 1(2) nm, α=80.307(2)°, β=77.334(2)°, γ=71.630(2)°, V =2.563 4(5) nm 3, D c=1.521 g·cm -3, Z=2, M r=586.90, μ=0.891 mm -1, F(000)=1 184, the final R =0.031 7, wR =0.067 5. The crystal structure shows that the cadmium ion is coordinated with two nitrogen atoms from one phen molecule and five oxygen atoms respectively from three cinnamic acids, giving a pentagonal bipyramid coordination geometry. CCDC: 687380.
作者：
Deng Yi-Fang;Chen Man-Sheng;Kuang Dai-Zhi*;Zhang Chun-Hua;Tang Si-Ping
期刊：
无机化学学报,2008年24(9):1535-1538 ISSN：1001-4861
通讯作者：
Kuang Dai-Zhi
作者机构：
[Deng Yi-Fang; Chen Man-Sheng; Kuang Dai-Zhi; Zhang Chun-Hua; Tang Si-Ping] Hengyang Normal Univ, Dept Chem & Mat Sci, Hengyang 421008, Hunan, Peoples R China.
通讯机构：
[Kuang Dai-Zhi] H;Hengyang Normal Univ, Dept Chem & Mat Sci, Hengyang 421008, Hunan, Peoples R China.
关键词：
锰配合物;晶体结构;5-二甲基苯甲酸;水热合成
摘要：
The title compound, [Mn3(L)6(CH3OH) 2]n·0.5nH2O (1), where HL=3,5-dimethylbenzoic acid, was synthesized and its crystal structure was determined by X-ray diffraction structure analysis. The crystal is of triclinic, space group P1 with a=1.275 1(13) nm, b=1.354 6(14) nm, c=1.882 3(19) nm, α=110.826(1)°, β=94.358(2)°, γ=108.038(1)°, V=2.825 4(5) nm3, Z=1, Mr=2 265.77, Dc=1.332 g·cm-3, μ=0.723 mm-1, F(000)=1 180, R int=0.037, R=0.056 4, wR=0.128 5. In the crystal the manganese atom is six-coordinated by six oxygen atoms, completing an octahedral geometry. The molecules are connected by 3,5-dimethylbenzoic acid to form a 1D chain structure bridged. CCDC: 694097.
摘要：
An ultrasonically assisted extraction (UAE) technique was developed for the extraction of manganese from electrolytic manganese slag using a sulfuric acid-hydrochloric acid mixture (4:0.3, v/v) as solvent. The UAE conditions were optimized and the significance of variables affecting UAE tested. The determination of manganese was carried out by atomic absorption spectrophotometry (AAS). The ultrasonic extraction efficiency of manganese can reach about 90% under the following optimum conditions: solvent-slag ratio: 4 mL/g; temperature: 333 K; particle size: 0.2 mm; extraction time: 35 min; amount of additive (citric acid): 8 mg/g slag. During the UAE process, the particle size parameter on the extraction was the most significant, followed by solvent-slag ratio, citric acid mass, time and temperature. The repeatability of UAE technique was satisfactory. The ultrasonic method shown to be a much superior approach to the conventional extraction method in the extraction of manganese from slag. (C) 2007 Elsevier B.V. All rights reserved.
摘要：
The title compound, [Mn_4(O_2CH)_4(phen)_8](ClO_4)_4·6H_2O (1), where phen= 1,10-phenanthroline, was synthesized and its crystal structure was determined by X-ray diffraction structure analysis. The crystal is of monoclinic, space group P2/c with a= 1.928 0(16) nm, b = 1.297 0(11) nm, c =2.126 4(18) nm, V=5.242 2(8) nm~3, Z=2, M_r=2 347.36,D, c=1.487 g·cm~(-3)，μ=0.659 mm-1, F(000)=2 400, R_(int)=0.043 7, R=0.052 3, wR=0.118 6. The Mn atoms are octahedrally coordinated by two O atoms of two ligands and four N atoms of two 1,10-phenanthroline molecules. The carboxyl group coordinates to Mn(Ⅱ) in the bridging bidentate mode. CCDC: 675520.
