ISSN : 0970 - 020X, ONLINE ISSN : 2231-5039
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Copper(II) Carboxylate Containing Paddle Wheel Structure: Synthesis and Crystal Structure

Adnan M. Qadir

Department of Chemistry, Collage of Science, Salahaddin University, Erbil 44001, Kurdistan Region, Iraq.

Corresponding Author E-mail: aq701998@gmail.com

DOI : http://dx.doi.org/10.13005/ojc/330249

Article Publishing History
Article Received on : January 09, 2017
Article Accepted on : March 22, 2017
Article Metrics
ABSTRACT:

A dinuclear copper(II) complex of the type [Cu2(2-nb)4(MeOH)2] (2-nb = 2-nitrobenzoate) has been synthesized and characterized by single crystal X-ray diffraction method. The compound belongs to monoclinic space group P21/c with a = 19.9374(10) ٫ b = 21.1404(11) ٫c = 7.6533(4) Å, α = 90٫ β = 96.817(3)٫ γ = 90º٫ V = 3246.8(3) Å 3٫ Z = 4٫ F(000) = 1736.0.0٫ Dc = 1.774Mg/m3,  μ = 1.422 mm-1. The Cu(II) complex is a cocrystal containing two inorganic units. Each Cu(II) adopted square pyramidal geometry.

KEYWORDS:

Paddle wheel; Nickel; Synthesis; Carboxylate

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Qadir A. M. Copper(II) Carboxylate Containing Paddle Wheel Structure: Synthesis and Crystal Structure. Orient J Chem 2017;33(2).


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Qadir A. M. Copper(II) Carboxylate Containing Paddle Wheel Structure: Synthesis and Crystal Structure. Orient J Chem 2017;33(2). Available from: http://www.orientjchem.org/?p=31049


Introduction

Generally, most copper(II) carboxylates display the dinuclear paddle-wheel cage structure which consists of two copper centers bridged by four carboxylate molecules and each copper(II)  is attached to a neutral ligand . The dimeric copper (II) carboxylates with the formula [Cu2(RCOO)4 L2] are known to contain two or more antiferromagnetically coupled metal centers [1-4]. Dinuclear copper(II) compounds with four synsyn bridging carboxylato ligands are of special interest due to their fungicidal activity which should arise from the unique coordination sphere around central copper(II) ions[5]. A paddle-wheel structure type was first reported in 1953 for the case of cupric acetate dehydrate [6]. Carboxylate ligands can coordinate to metal center in monodenate, bidentate or bridging mode[7]. Copper is a significant transition metal in biology and coordination chemistry [8,9]. Dinuclear copper centres are present in the oxygen breathing protein hemocyanin and in a number of enzymes which have oxidase or oxygenase function[10] . Different members of metalloproteins of the type-3 with binuclear copper sites are known: hemocyanins, tyrosinase, catechol oxidase with bridging oxygen atoms and cytochrome coxidase with bridging sulfur atoms. In most of these,copper is ligated by histidine and cysteine amino acids[11,12]. In this work, we report synthesis and crystal structure of  binuclear Cu(II) complex containing 2-nitrobenzoic acid. The complex exhibited a paddlewheel structure.

Experimental

Synthesis

A mixture of 2-nitrobenzoic acid (0.302 g, 2 mmol) and K2CO3(0.138 g, 1 mmol) in H2O (10ml) was added to Cu(NO3)2 (0.188 g, 1 mmol) in H2O (10ml). The mixture was stirred for 30 minutes. The precipitate formed was filtered and recrystallized from MeOH.

Crystal structure determination

Single crystal of the title compound with dimensions of 0.44 mm × 0.42 mm × 0.12 mm was mounted on   Bruker APEX-II CCD diffractometer equipped with a graphite-monochromated MoKα  radiation (λ = 0.71073 Å) at 100.0(2) K. The compound crystallizes in monoclinic space group P21/c with a = 19.9374(10) ٫ b = 21.1404(11) ٫c = 7.6533(4) Å α =90٫ β = 96.817(3)٫ γ = 90º٫ V = 3246.8(3) Å3٫ Z = 4٫ F(000) = 1736.0.0٫ Dc = 1.774Mg/m3,  μ = 1.422 mm-1.The structure was solved by direct method using XS solution program and refined by least-squares techniques using XL [13] refinement package. Empirical absorptions were applied to all intensity data. All hydrogen atoms  were placed in geometrically calculated positions and allowed to ride on the parent carbon atoms. The full final matrix least square refinement gave R= 0.0356 and wR= 0.0805.

Results and Discussion

Crystal Structure

Crystal structure of the Cu(II) complex is depicted in Fig. 1. Crystallographic data and refinement   are given in Table-1. Selected bond lengths and angles are given in Table-2.

The title compound belongs to monoclinic P21/c space group with four molecules in the unit cell. The Cu(II) complex is cocrystal with two neutral inorganic components (1 and 1′). In both components, two Cu(II) centers are bridged by four carboxylate groups of the four ligands.

Table 1: Crystallographic Data And Refinement For Cu(Ii)  Complex

Crystal data

Chemical formula

C30H24Cu2N4O18

 Formula weight

855.61

Cell system, space group

monoclinic, P21/c

a (Å)

19.9374(10)

b (Å)

21.1404(11)

c (Å)

7.6533(4)

α(°)

90

β(°)

96.817(3)

γ(°)

90

Volume (Å3)

3246.8(3)

Z

4

Dc(Mg m–3)

1.774

μ (mm-1)

1.422

Crystal size (mm)

0.44 × 0.42 × 0.12

2Θ range for data collection

5.638 to 69.496

Index ranges

-27 ≤ h ≤ 31, -33 ≤ k ≤ 33, -12 ≤ l ≤ 10

Reflection collected

75054

Independent reflections

12506 [Rint = 0.0470, Rsigma = 0.0465]

Data/restraints/parameters

12506/6/495

F (000)

1736

Goodness-of-fit on F2

1.054

R1 [I > 2σ(I)]

R1 = 0.0356

wR2 [I > 2σ(I)]

wR2 = 0.0805

R1 (all data)

R1 = 0.0626

wR2 (all data)

wR2 = 0.0897

Min. and max. resd. dens. [e/Å3],

0.46/-0.81

In compound 1, Cu1 has distorted square-pyramidal geometry coordinated by O1,O2,O3 and O4 from four carboxylate molecules in the basal plan and O5 from MeOH molecule in the apical position. The angular and structural parameter (τ) is 0.16.The bond lengths Cu1-O1, Cu1-O2, Cu1-O3 and Cu1-O4 are 1.9671(10), 1.9722(10), 1.9670(10) and 1.9638(10) Å, respectively, while the apical bond length Cu1-O5 is 2.1451(10) Å. The values are in agreement with bond distances for other binuclear Cu(II) complex. The bond angles O5-Cu1-Ocarboxylate range from 93.19(4) to 97.78(4)°.The Cu1-Cu11bond distance is 2.6210 (4) Å in the dinuclear unit.

In compound 1′, Cu1′ has almost regular square-pyramidal geometry (τ =0.0105) coordinated by O1′,O2′,O3′ and O4′ from four carboxylate ligands in the basal plan and O5′ from MeOH molecule in the apical position. The Cu1′-Ocarboxylate bond lengths range 1.9586(11) from to 1.9798(10) Å, while the apical bond length Cu1′-O5′ is 2.1898(11) Å. The bond angles O5′-Cu1′-O1′, O5′-Cu1′-O2′, O5′-Cu1′-O3′ and O5′-Cu1′-O4′ are 88.06(4), 93.63(4), 102.69(4) and 96.84(4)°, respectively. The Cu1′-Cu1′2 bond distance is 2.6210 (4) Å.

Table 2: Selected Bond Lengths (Å) and Angles (°) For The Complex

Bond length (Å)

Cu1-O1Cu1-O2Cu1-O3Cu1-O4Cu1-O5Cu1-Cu11 1.9671(10)1.9722(10)1.9670(10)1.9638(10)2.1451(10)2.6210(4) Cu1′-O1’Cu1′-O2’Cu1′-O3’Cu1′-O4’Cu1′-O5’Cu1′-Cu1′2 1.9622(10)1.9658(10)1.9586(11)1.9798(10)2.1898(11)2.6134(4)

Bond angle (°)

O5-Cu1-O1O5-Cu1-O2O5-Cu1-O3O5-Cu1-O4O1-Cu1-O3O2-Cu1-O4 97.15(4)93.19(4)93.60(4)97.78(4)169.18(4)169.02(4) O5′-Cu1′-O1’O5′-Cu1′-O2’O5′-Cu1′-O3’O5′-Cu1′-O4’O1′-Cu1′-O3’O2′-Cu1′-O4′ 88.06(4)93.63(4)102.69(4)96.84(4)168.88(4)169.51(4)

 

Figure 1: Molecular structure for the complex

Figure 1: Molecular structure for the complex

 


Click here to View Figure

 

Supplementary Material

CCDC 1420202 contains the supplementary crystallographic data for this paper. These data can be obtained free of charge at www.ccdc.cam.ac.uk/conts/retrieving.html or from the Cambridge Crystallographic Data Centre (CCDC), 12 Union Road, Cambridge CB2 1EZ, UK (Fax: +44-1223-336033; email: deposit@ccdc.cam.ac.uk or www:http://www.ccdc.cam.ac.uk).

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