不對稱大環雙核銅(Ⅱ)配合物[Cu2(C23H26Cl2N4O2)](ClO4)2的合成、晶體結構及磁性

劉 煥潘志權冷士良張雪梅夏先偉

(1徐州工業職業技術學院化學工程系，徐州 221140)

(2武漢工程大學化學與制藥學院，湖北省新型反應器與綠色化學工藝重點實驗室，武漢 430073)

不對稱大環雙核銅(Ⅱ)配合物[Cu2(C23H26Cl2N4O2)](ClO4)2的合成、晶體結構及磁性

劉 煥＊,1潘志權2冷士良1張雪梅1夏先偉1

(1徐州工業職業技術學院化學工程系，徐州 221140)

(2武漢工程大學化學與制藥學院，湖北省新型反應器與綠色化學工藝重點實驗室，武漢 430073)

大環雙核銅（Ⅱ）配合物由N，N′-二甲基-N，N′-二(3-甲酰基-5-氯水楊醛)乙二胺和1，3-丙二胺，與銅（Ⅱ）反應形成的，經過X-射線單晶衍射結果表明：a=0.87105(16)nm，b=0.95778(18)nm，c=1.8104(3)nm，β=100.761(18)°，V=1.4838(5)nm3，Z=2，Dc=1.762 Mg·m-3，μ=1.85 mm-1，F(000)=796，and final R1=0.061，wR2=0.126。晶體結構表明：兩個銅離子位于雙核大環中間，與大環的胺、亞胺以及酚羥基的氧進行配位。磁性結果表明配合物為反鐵磁性。

晶體結構；雙核銅配合物；磁性

0 Introduction

The dinuclear metals macrocyclic complex with aminic and iminic sites are of current interest due to unique physicochemicalproperties[1-4].Phenol-based macrocyclic ligands,having dissimilar (Namine)2O2and(Nimine)2O2metal-binding sites sharing the phenolic oxygen atoms,have been used for bounding two metalsto form asymmetric compartmental dinuclear copper（Ⅱ）complex[5-8].The proligand N,N′-dimethyl-N,N′-bis(3-formyl-5-chlorosalicylidene)ethylenediamine have been developed for providing heterodinuclear,tetranuclear or pentanuclear metal complexes[9-11].In this paper,we report on synthesis,crystal structure and magnetic property of this complex[Cu2(C23H26Cl2N4O2)](ClO4)2.

1 Experimental

1.1 General procedures

All commercially available chemicals and solvents are reagent grade and used as received without further purification.Elemental analysis for C,H and N were performed on a Perkin-Elmer 240 analyzer.Variabletemperature magnetic susceptibilities(1.8～300 K)of a power sample were measured on a SQUID MPMS XL-7,and were corrected fordiamagnetism by Pascal constants.IR spectrum was recorded using KBr disc on a vector 22 FTIR spectrophotometer.

1.2 Synthesis of the complex

N,N ′-Dimethylethylenediamine(0.176 g,2.0 mmol),5-chlorosalicylaldehyde (0.800 g,4.0 mmol),and paraformaldehyde(0.160 g,5.3 mmol)were dissolved in methanol(50 mL),and the mixture was refluxed for 1 week to form a white powder.The white powder and copper(II)acetate tetrahydrate(0.448 g,2.0 mmol)were dissolved in solution of acetonitrile(50 mL)at ambient temperature with stirring for 4 h.To this solution,Cu(ClO4)2·6H2O (0.755 g,2.0 mmol)and 1,3-propanediamine (0.148 g,2.0 mmol)was dropped with stirring,respectively(Scheme 1).The mixture was stirred for 10 h was concentrated to afford a dark green precipitate(0.620 g,yield 53%).Elemental analysis calculated for Cu2C24H27N4Cl3O12(%):C,36.17;H,3.41;N,7.03.Found(%):C,36.15;H,3.44;N,7.01.IR(KBr):3419.14,1631,1555.32,1296.46 cm-1.

1.3 Crystal structure determination

A single crystal with dimensions of 0.32 mm×0.26 mm×0.24 mm was selected for X-ray structure analysis.The data were collected on a Bruker Smart Apex CCD diffractometer equipped with a Mo Kα radiation(λ=0.071 073 nm)at 298 K.A total of 15 477 reflectionswere collected in the range of 1.14°≤θ≤26.00°by using an ω-2θ scan mode,of which 5 798 were unique with Rint=0.055 and 4 438 observed reflections with I＞2σ(I).Data reduction and cell refinement were performed by the SMART and SAINT Program[12].The structures were determined by the direct method(Bruker Shelxtl)and refined on F2by full-matrix least squares(Bruker Shelxtl)using all unique data[13].The non-H atoms in the structure were anisotropic.All the hydrogen atoms were placed in calculated positions assigned fixed isotropic thermal parameter at 1.2 times the equivalent isotropic U of the atoms to which they are attached(1.5 times for methyl group)and allowed to ride on their respective parent atoms.Details of the crystal parameters,data collection,and refinements of the title complex are summarized in Table 1.

CCDC:624712.

Table 1 Crysta data and structure refinement parameters for the title complex

2 Results and discussion

2.1 Crystal structure

The crystal structure[Cu2(C23H26Cl2N4O2)](ClO4)2were shown in Fig.1.The selected bond lengths and bond angles of non-hydrogen atoms are listed in Table 2.The crystal structure of complex reveals that the title complex is dinuclear Cu（Ⅱ）macrocyclic complex with(Namine)2O2and(Nimine)2O2metal-binding sites and each Cu（Ⅱ） ion is six-coordinate.Atom Cu1 is coordinated by two amine and two phenoxide donors,while Cu2 is coordinated by two imine and two phenoxide donors.The basal Cu1-to-ligand bond distances rang from 0.189 2 to 0.196 8 nm and the basal Cu2-to-ligand bond distances rang from 0.1915 to 0.1988 nm.The perchlorate anions coordinate weakly to Cu1 and Cu2 with Cu-O distances of 0.2824(5)nm(Cu1-O6),0.251 1(6)nm(Cu1-O7),0.256 5(5)nm(Cu2-O3)and 0.2648(6)nm(Cu2-O8).Two Cu（Ⅱ） centers are equivalently bridged by the phenolic oxygens with the intermetallic separation of 0.3014 nm.

The dihedral angle between the (Namine)2O2and(Nimine)2O2planes is 1.2(3)°.The deviations of Cu1 and Cu2 from these planes are 0.011 80(9)and 0.003 38(9)nm,respectively.The N1 and N2 have S and R configurations,respectively.The two methyl groups attached to atoms N1 and N2 are cis to each other,theCu1-N2-C23 and Cu1-N1-C22 angles are 110.28°and 111.44°.

Table 2 Selected bond lengths(nm)and bond angles(°)for the title complex

Moreover,the perchlorate anions play a key role in maintaining the three-dimensional structure of the complex.To illustrate the role,the interactions of one perchlorate anion with the adjacent macrocyclic rings are shown in Fig.2,two macrocyclic rings in adjacent chains through C-H…O hydrogen-bond interactions,where the O atoms are from perchlorate anions.It is obvious that there are two hydrogen bond interactions in each macrocyclic unit of the complex,the hydrogen bond lengths are 0.2398 nm for O(9A)…H(18C)and 0.2396 nm for O(8A)…H(5A).

2.2 Magnetic properties

The magnetic susceptibility of[Cu2(C23H26Cl2N4O2)](ClO4)2was measured in the temperature range of 1.79～300 K,and the data are shown in Fig.3 as plot of χmT versus temperature(T).The temperature dependence of magnetic susceptibility(χm)of the title complex is typical of antiferromagnnetically interacting CuⅡCuⅡ.The χmT data is fitted to Bleaney-Bowers equation(1).In this expression N is Avogadro′s number,β is Bohr magneton,g is the Landé g value,J is the exchange integral,T is the absolute temperature,k is the Boltzmann constant,ρ is the fraction of a paramagnetic impurity,and Nαisthe temperature-independent paramagnetism[14-16].The best-fit parameters obtained using the parameters are J=-369.3 cm-1,g=2.01, ρ=0.0026,Nα=0.00044 cm3·mol-1.

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Synthesis,Crystal Structure and Magnetic Properties of the Asymmetric Dinuclear Copper（Ⅱ）Macrocyclic Complex[Cu2(C23H26Cl2N4O2)](ClO4)2

LIU Huan＊,1PAN Zhi-Quan2LENG Shi-Liang1ZHANG Xue-Mei1XIA Xian-Wei1
(1Department of Chemical Engineering,Xuzhou College of Industrial Technology,Xuzhou,Jiangsu 221140,China)
(2School of Chmical Engineering&Pharmacy,Hubei Key Laboratory of Novel Chemical Reactor and Green Chemical Technology,Wuhan Institute of Technology,Wuhan 430073,China)

The dinuclear copper（Ⅱ） macrocyclic complex has been synthesized by condensation between N,N′-dimethyl-N,N′-bis(3-formyl-5-chlorosalicylidene)ethylene diamine and 1,3-propanediamine in the presence of copper（Ⅱ）.The complex was determined by X-ray diffractions single crystal structure analysis.The results indicates that the complex crystallizes in monoclinic,space group P21,Flack parameters(x)=0.06(2),with a=0.87105(16)nm,b=0.95778(18)nm,c=1.8104(3)nm,β=100.761(18)°,V=1.4838(5)nm3,Z=2,Dc=1.762 Mg·m-3,μ=1.85 mm-1,F(000)=796,and final R1=0.061,wR2=0.126,The crystal structure shows that the two copper（Ⅱ）ions in the phenolbased macrocyclic dinuclear complex,are coordinated with (Namine)2O2and (Nimine)2O2sites.Magnetic measurements reveal an antiferromagentic interaction in the complex.CCDC:624712.

crystal structure;dinuclear copper complex;magnetic properties

O614.121

A

1001-4861(2011)03-0590-05

2010-07-14。收修改稿日期：2010-09-28。

國家自然科學基金資助項目(No.20271039)。

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