34 卷 4 期结构化学 (JIEGOU HUAXUE) Vol. 34, No Chinese J. Struct. Chem

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1 34 卷 4 期结构化学 (JIEGOU HUAXUE) Vol. 34, No Chinese J. Struct. Chem Syntheses, Structures and Characteristics of Two New Cu(II) Coordination Polymers Based on 4-tert-butyl-phthalate and Different Bis(1,2,4-triazol-1-yl) Co-Ligands 1 HAN Min-Le a2 LING Xun-Li a CHANG Xin-Hong a LIU Guang-Zhen a DU De-Guang b a (College of Chemistry and Molecular Engineering, Luoyang Normal University, Luoyang , China) b (Henan Huier Nano Technology Co., Ltd., Luoyang , China) ABSTRACT Two new Cu(II) coordination polymers, [Cu 2 (tbph) 2 (btb) 2 ] n (1) and {[Cu 2 (tbph) 2 - (bth) 2 ] H 2 O} n (2), (H 2 tbph = 4-tert-butyl-phthalic acid, btb = 1,4-bis(1,2,4-triazol-1- yl)butane, bth = 1,6-bis(1,2,4-triazol-1-yl)hexane), have been synthesized and characterized by elemental analysis, FT-IR and X-ray single-crystal diffraction. Complex 1 has a 2D sql layer. Complex 2 shows a (3,4)-connected 2D sheet with a ( )(4.8 2 ) topology. The thermal behavior of the two corresponding complexes has briefly been investigated. Keywords: Cu(II) complex, crystal structure, 4-tert-butyl-phthalic acid, 1,4-bis(1,2,4-triazol-1-yl)butane, 1,6-bis(1,2,4-triazol-1-yl)hexane; DOI: /j.cnki INTRODUCTION Studies of metal-organic frameworks (MOFs) containing long flexible N-donor ligand are of considerable interest due to their fascinating network topologies and potential applications as functional materials [1-5]. The long flexible ligands with nitrogen donors have been widely utilized in the construction of MOFs, as the flexible ligands have variable coordination modes, and can adopt a variety of conformations according to the restrictions imposed by the coordination geometry of metal ions [6-10]. According to previous studies, the bis(1,2,4-triazol-1-yl) ligands are most useful organic building blocks with special abilities and have signficant influence on the assembly systems of multicarboxylate ligands and metal centers [11-15]. On the other hand, phthalic acid (benzene-1,2- dicarboxylic acid) and its derivatives have been widely utilized to construct coordination poly- mers [16-19]. As a continuation of our previous inves- tigation, in this paper, we reacted 4-tert-butylphthalic anhydride with Cu 2+ ions, and then employed different bis(1,2,4-triazol-1-yl) ligands, btb and bth as auxiliary ligands, which feature two structures, namely [Cu 2 (tbph) 2 (btb) 2 ] n (1) and Received 16 October 2014; accepted 19 January 2015 (CCDC for 1 and for 2) 1 Supported financially by Henan Province basic and frontier technology research projects of Henan Provincial Department of Science and Technology (No ) 2 Corresponding author. Han Min-Le, male, born in 1978, associate professor, majoring in functional coordination chemistry. minle_han@163.com

2 HAN M. L. et al.: Syntheses, Structures and Characteristics of Two New Cu(II) Coordination 544 Polymers Based on 4-tert-butyl-phthalate and Different Bis(1,2,4-triazol-1-yl) Co-Ligands No. 4 {[Cu 2 (tbph) 2 (bth) 2 ] H 2 O} n (2). Herein, we report their syntheses, crystal structures and thermal behaviors. 2 EXPERIMENTAL 2. 1 Materials and methods All chemicals purchased were of analytical grade and used without further purification. Elemental analyses (C, H, and N) were performed on a Flash 2000 organic elemental analyzer. The infrared spectra (4000 ~ 600 cm 1 ) were recorded on a NICOLET 6700 FT-IR spectrometer. Thermal analysts were performed on an SII EXStar6000 TG/DTA6300 analyzer heated from 30 to 700 under nitrogen atmosphere Syntheses of complexes 1 and [Cu 2 (tbph) 2 (btb) 2 ] n (1) A mixture of 4-tert-butyl-phthalic anhydride (40.6 mg, 0.2 mmol), Cu(OAc) 2 2H 2 O (38.2 mg, 0.2 mmol), btb (38.6 mg, 0.20 mmol), and KOH (11.2 mg, 0.2 mmol) were added to water (10 ml) in a 25 ml Teflon-lined stainless steel vessel. The mixture was kept at 393 K for 3 days and then slowly cooled down to room temperature. Blue block crystals of 1 were obtained. Yield: 45% based on Cu. Elemental analysis (%): calcd. (%) for C 40 H 46 Cu 2 N 12 O 8 (M r = ): C, 50.57; H, 4.88; N, Found (%): C, 50.46; H, 4.82; N, {[Cu 2 (tbph) 2 (bth) 2 ] H 2 O} n (2) 2 was prepared by a similar way as that described for 1, except that btb was replaced by bth (44.2 mg, 0.1 mmol). Yield: 40% based on Cu. Elemental analysis (%): calcd. (%) for C 22 H 29 CuN 6 O 4.50 (M r = ): C, 51.50; H, 5.70; N, Found (%): C, 51.41; H, 5.64; N, Structure determination Single-crystal X-ray diffraction analyses of 1 and 2 were carried out on a Bruker SMART APEX II CCD diffractometer equipped with a graphitemonochromated MoΚα radiation (λ = Å) by using a φ-ω scan technique at room temperature. All structures were solved by direct methods with SHELXS-97 [20]. A full-matrix least-squares refinement on F 2 was carried out using SHELXL-97 [21]. The H atoms were assigned with common isotropic displacement factors and included in the final refinement with geometrical restrains. In the structure of 2, the disordered methyl groups of half tbph and disordered methene carbon atoms C(30), C(31), C(32) and C(33) of btb were restrained in order to obtain reasonable thermal parameters. The crystallographic data are listed in Table 1. Selected bond lengths and bond angles for 1 and 2 are listed in Table 2. Table 1. Crystallographic Data and Details of the Experiment and Refinement for 1 and Empirical formula C 40H 46Cu 2N 12O 8 C 22H 29CuN 6O 4.50 Formula weight Temperature/K 296(2) 296(2) Crystal system Triclinic Monoclinic Space group P 1 P2 1/n a/å (12) (3) b/å (12) (8) c/å (16) (4) α/ o (2) 90 β/ o (2) (3) γ/ o (10) 90 V/Å (2) 4794(2) Z 1 8 D c/g cm µ/mm F(000) To be continued

3 2014 Vol. 33 结 构化学 (JIEGOU HUAXUE)Chinese J. Struct. Chem θ range/ o 2.28~ ~25.50 Reflns. collected Independent reflns R int Data/restraints/parameters 3883/0/ /94/636 GOOF R a wr b (I > 2σ(I)) R (all data) wr (all data) (Δρ) max and (Δρ) min (e Å -3 ) 1.192, , a R = Σ( F o F c )/Σ F o ; b wr = {Σ[w( F 2 o F 2 c ) 2 ]/Σ[w( F o 2 ) 2 ]} 1/2 Table 2. Selected Bond Lengths (Å) and Bond Angles ( ) for 1 and 2 1 Bond Dist. Bond Dist. Bond Dist. Cu(1) N(1)A 1.991(4) Cu(1) N(1) 1.991(4) Cu(1) O(2)A 2.052(3) Cu(1) O(2) 2.052(3) Cu(1) O(1) 2.434(4) Cu(1) O(1)A 2.434(4) Cu(2) N(6)B 1.990(3) Cu(2) N(6)C 1.990(3) Cu(2) O(3)D 2.022(4) Cu(2) O(3) 2.022(4) Angle ( ) Angle ( ) Angle ( ) N(1)A Cu(1) N(1) 180.0(2) N(1)A Cu(1) O(2)A 90.86(14) N(1) Cu(1) O(2)A 89.14(14) N(1)A Cu(1) O(2) 89.14(14) N(1) Cu(1) O(2) 90.86(14) O(2)A Cu(1) O(2) N(1)A Cu(1) O(1) 91.66(14) N(1) Cu(1) O(1) 88.34(14) O(2)A Cu(1) O(1) (12) O(2) Cu(1) O(1) 57.71(12) N(1)A Cu(1) O(1)A 88.34(14) N(1) Cu(1) O(1)A 91.66(14) O(2)A Cu(1) O(1)A 57.71(12) O(2) Cu(1) O(1)A (12) O(1) Cu(1) O(1)A N(6)B Cu(2) N(6)C (18) N(6)B Cu(2) O(3)D 89.86(14) N(6)C Cu(2) O(3)D 90.14(14) N(6)B Cu(2) O(3) 90.14(14) N(6)C Cu(2) O(3) 89.86(14) O(3)D Cu(2) O(3) 180.0(4) Symmetry transformation: A: x+1, y, z+1; B: x+1, y+1, z; C: x, y 1, z; D: x+1, y, z 2 Bond Dist. Bond Dist. Bond Dist. Cu(1) O(5) 1.963(4) Cu(1) O(1) 1.974(4) Cu(1) N(12)A 1.981(5) Cu(1) N(7) 1.984(5) Cu(2) O(3) 1.920(4) Cu(2) N(1) 1.972(4) Cu(2) N(6)B 1.997(4) Cu(2) O(7)C 2.019(4) Angle ( ) Angle ( ) Angle ( ) O(5) Cu(1) O(1) (19) O(5) Cu(1) N(12)A 89.38(18) O(1) Cu(1) N(12)A 91.70(19) O(5) Cu(1) N(7) 89.79(18) O(1) Cu(1) N(7) 90.60(19) N(12)A Cu(1) N(7) 176.3(2) O(3) Cu(2) N(1) 88.18(18) O(3) Cu(2) N(6)B 89.07(18) N(1) Cu(2) N(6)B 168.5(2) O(3) Cu(2) O(7)C (17) N(1) Cu(2) O(7)C 93.49(17) N(6)B Cu(2) O(7)C 91.32(17) Symmetry transformation: A: x 1, y, z; B: x, y, z+1; C: x, y, z 3 RESULTS AND DISCUSSION 3. 1 Crystal structure description The asymmetric unit of 1 contains two Cu(II) atoms, two tbph, and two btb. As shown in Fig. 1a, there are two crystallographically independent Cu(II) atoms in 1. Cu(1) is coordinated by four oxygen atoms from two chelating carboxylate groups of two tbph and two trans nitrogen atoms of btb to finish a distorted octahedral geometry. The apical positions are occupied by two nitrogen atoms (N(1) and N(1)A) with the N(1) Cu(1) N(1)A angle of 180.0(2). The Cu(2) atom is four-coordinated by two oxygen atoms from two monodentate carboxylate groups of two tbph, and two nitrogen atoms from two btb with a slightly distorted squareplanar geometry. For Cu(1) atom, the Cu(1) O(1)/O(1)A distances (2.434(4) Å) are longer than the Cu(1) O(2)/O(2)A (2.052(3) Å) and Cu(1) N(1)/N(1)A (1.991(4) Å) distances, reflecting Jahn- Teller distortion. A distorted octahedral geometry is also confirmed by the bond angles of O(2)A

4 HAN M. L. et al.: Syntheses, Structures and Characteristics of Two New Cu(II) Coordination 546 Polymers Based on 4-tert-butyl-phthalate and Different Bis(1,2,4-triazol-1-yl) Co-Ligands No. 4 Cu(1) O(1), O(2) Cu(1) O(1)A, O(2) Cu(1) O(1), and O(2)A Cu(1) O(1)A, which are found to be (12), (12), 57.71(12), and 57.71(12), respectively; while for Cu(2) atom, the Cu(2) O(3) distances (2.022(4) Å) are longer than the Cu(2) N(6) distances (1.990(3) Å). And the bond angles of N(6)B Cu(2) O(3)D, N(6)C Cu(2) O(3), N(6)B Cu(2) O(3), and N(6)C Cu(2) O(3)D are 89.86(14), 89.86(14), 90.14(14), and 90.14(14), respectively. Each tbph adopts a μ 2 -bridge linking two Cu(II) atoms, in which one carboxylate group adopts a chelating mode coordinating to one Cu(II) atom while another adopts a monodentate coordinating to one Cu(II) atom. As shown in Fig. 1b, the Cu(II) atoms are linked by tbph and btb to produce a 2D layer. Topological analysis reveals that each Cu(1)/ Cu(2) center can be regarded as the four-connected nodes and the tbph and btb as two kinds of linkers. Thus, the 2D layer can be considered as sql topology (Fig. 1c). (a) (b) (c) Fig. 1. Coordination environments of Cu(II) in complex 1. Hydrogen atoms are omitted for clarity. Symmetry codes: A: x+1, y, z+1; B: x+1, y+1, z; C: x, y 1, z; D: x+1, y, z. (b) View of the 2D layer in 1. (c) Schematic view of the sql topology. All hydrogen atoms are omitted for clarity The previously reported complex [Cu(btb)(1,2- bdc)] n shows a 3D CdS net [22]. This structure difference may be ascribed to the synergetic electrondonating and steric effects of the -C(CH 3 ) 3 group in tbph [23, 24]. Complex 2 contains two Cu(II) atoms, two tbph and two bth as well as one free water molecule. As shown in Fig. 2, both Cu(1) and Cu(2) are fourcoordinated by two O atoms of two tbph and two N atoms of two bth. The Cu N distances are in the range of 1.981(5)~1.997(4) Å and Cu O fall in the 1.920(4)~2.019(4) Å region. Each tbph adopts a μ 2 -bridge linking two Cu(II) atoms, in which both carboxylate groups adopt a monodentate coordinating mode to the Cu(II) atoms. The bth has two kinds of conformation and the N to N distances are 7.34 Å for conformation-a and 9.62 Å for conformation-b, respectively.

5 2014 Vol. 33 结构化学 (JIEGOU HUAXUE)Chinese J. Struct. Chem. 547 Fig. 2. Coordination environments of Cu(II) in complex 2. Hydrogen atoms are omitted for clarity. Symmetry codes: A: x 1, y, z; B: x, y, z+1; C: x, y, z As shown in Figs. 3a and 3b, each Cu(1) atom is linked to the two adjacent Cu(2) atoms via two tbph and two Cu(1) atoms via two conformation-b bth, while each Cu(2) atom is joined to the two adjacent Cu(1) atoms through two tbph and one Cu(2) atom through two conformation-a bth in a double-bridge fashion. Thus, the Cu(II) atoms are linked by tbph and bth to generate a 2D sheet. From the topological point of view, each Cu(1) can be viewed as a four-connected node, and each Cu(2) as a threeconnected node, resulting a (3,4)-connected sheet with stoichiometry (3-c)(4-c) (Fig. 3c). Topological analysis of the net indicates a ( )(4.8 2 ) topology. And the free water molecules are located in voids of the sheet by O H O hydrogen bonding between free water and carboxylic oxygen atoms (Table 3). These hydrogen bonding interactions bring further stability for the structure. (a) (b) (c) Fig. 3. (a) and (b) View of the 2D layer along different directions in 2. (c) Schematic view of the (3,4)-connected 2D sheet with ( )(4.8 2 ) topology. All hydrogen atoms and free water molecules are omitted for clarity

6 HAN M. L. et al.: Syntheses, Structures and Characteristics of Two New Cu(II) Coordination 548 Polymers Based on 4-tert-butyl-phthalate and Different Bis(1,2,4-triazol-1-yl) Co-Ligands No. 4 Table 3. Hydrogen Bond Lengths (Å) and Bond Angles ( ) for 2 D H A d(d H) d(h A) d(d A) DHA O(9) H(1W) O(4)D (6) O(9) H(2W) O(4)E (7) Symmetry codes: D: x, y+1, z; E: x+1, y+1, z The significant difference between 1 and 2 isolated under the same conditions must be ascribed to the nature of different spacer length of flexible bis(1,2,4-triazol-1-yl) co-ligands. In 1, the N to N distance of the btb ligand is 8.52 Å to join the Cu(1) and Cu(2) with the Cu(1) Cu(2) distance of Å; while for 2, the bth ligand has two kinds of conformations and the distances are 7.34 and 9.62 Å, respectively. Two adjacent Cu(2) atoms are bound by two conformation-a bth, reducing a [Cu 2 (bth) 2 ] unit with the Cu(2) Cu(2) distance of 7.62 Å, while two adjacent Cu(1) atoms are joined by two conformation-b bth with the Cu(1) Cu(1) distance of Å. Thus 1 displays a 2D sql layer while 2 shows a (3,4)-connected 2D sheet with a ( )(4.8 2 ) topology TGA and IR Thermogravimetric experiment of the complexes was carried out under air atmosphere at a heating rate of 10 min -1. As shown in Fig. 4, for complex 1, the framework collapses in the temperature range of 226~595. The final residue of 14.33% is close to the calculated 16.75% based on CuO. For 2, TGA under a nitrogen atmosphere reveals a weight loss of 39.37% up to 513 K, corresponding to the departure of free solvents and terminal water molecules (calcd %). Above this temperature, the complex starts to decompose rapidly, the observed weight losses including two steps between 30 and 535. The final mass remnant of 14.53% likely represents the deposition of CuO (15.51% calcd.). Fig. 4. TGA plots of complexes 1 and 2 IR spectrum of the two complexes corresponds with their single-crystal structures. IR spectra of 1 and 2, the IR spectra display characteristic bands of carboxylate at 1530 and 1526 cm -1 for ν asym(c-o), 1367 and 1402 cm -1 for ν sym(c-o), respectively. The Δν values (ν asym(c-o) ν sym(c-o) ) are 163 and 124 cm -1, respectively. For 2, a broad band centered at ~3400 cm -1 indicates O H stretching of the water molecule. 4 CONCLUSION In summary, two new 2D coordination polymers of Cu(II) have been synthesized and characterized. Complexes 1 and 2 display appealing structural features from sql layer to (3,4)-connected ( )(4.8 2 ) sheet. The results reveal that the different spacer length of flexible bis(1,2,4-triazol-1-yl) co-ligands plays an important role in governing the final

7 2014 Vol. 33 结构化学 (JIEGOU HUAXUE)Chinese J. Struct. Chem. 549 structures. Subsequent research will be focused on the preparation and properties of new coordination polymers by using the similar O-donor and N-donor tectons. REFERENCES (1) Lago, A. B.; Carballo, R.; Rodríguez-Hermida, S.; Vázquez-López, E. M. Copper(II) acetate/bis(4-pyridylthio)methane system: synthesis, structural diversity, and single-crystal to single-crystal transformation. Cryst. Growth Des. 2014, 14, (2) Cheng, P. C.; Yeh, C. W.; Hsu, W.; Chen, T. R.; Wang, H. W.; Chen, J. D.; Wang, J. C. Ag(I) complexes containing flexible N,N -di(3-pyridyl)adipoamide ligands: syntheses, structures, ligand conformation, and crystal-to-crystal transformations. Cryst. Growth Des. 2012, 12, (3) Zhao, J.; Li, D. S.; Wu, Y. P.; Dong, W. W.; Bai, L.; Lu, J. Y. Structural diversity and properties of six coordination polymers derived from 1,2/1,3-phenylenedioxydiacetic acids and varied N-donor co-ligands. Inorg. Chim. Acta 2014, 413, (4) Chang, X. H.; Zhao, Y.; Han, M. L.; Ma, L. F.; Wang, L. Y. Five Cd(II) coordination polymers based on 2,3,5,5 -biphenyltetracarboxylic acid and N-donor coligands: syntheses, structures and fluorescent properties. CrystEngComm. 2014, 16, (5) Wu, J.; Liu, J. Q.; Lin, J. T.; Wu, T.; Wu, X. R.; Zhou, C. H.; Qin, X. Y. Two new entangled coordination polymers constructed by flexible coligands: synthesis, magnetism, and gas absorption. Inorg. Chim. Acta 2014, 405, (6) Carlucci, L.; Ciani, G.; Proserpio, D. M.; Rizzato, S. New polymeric networks from the self-assembly of silver(i) salts and the flexible ligand 1,3-bis(4-pyridyl)porpane (bpp). A systematic investigation of the effects of the counterions and a survey of the coordination polymers based on bpp. CrystEngComm. 2002, 4, (7) Yang, J. X.; Qin, Y. Y.; Cheng, J. K.; Yao, Y. G. Tuning different kinds of entangled networks by varying N-donor ligands: from self-penetrating to multi-interpenetrating. Cryst. Growth Des. 2014, 14, (8) Qi, Y.; Wang, Y. Five new Mn(II) complexes based on flexible bis(imidazole) ligands: synthesis, structure and magnetic properties. Polyhedron 2014, 73, (9) Liu, J. Q.; Wang, Y. Y.; Wu, T.; Wu, J. Control over multifarious entangled Co(II) metal-organic frameworks: role of steric bulk and molar ratio of organic ligands. CrystEngComm. 2012, 14, (10) Mei, C. Z.; Wang, H. R.; Xiong, H. L.; Meng, R. J.; Shan, W. W.; Li, H. H. Hydrothermal synthesis and crystal structure of one 3D coordination polymer of nickel(ii) achieved from 5-iodo-isophthalic acid ligand. Chin. J. Struct. Chem. 2014, 33, (11) Zhang, P.; Li, D. S.; Zhao, J.; Wu, Y. P.; Li, C.; Zou, K.; Lu, J. Y. Four Zn(II)/Cd(II) coordination polymers derived from isomeric benzenedicarbocylates and 1,6-bis(triazol)hexane ligand: synthesis, crystal structure, and luminescent properties. J. Coord. Chem. 2011, 64, (12) Ding, J. G.; Zhu, X.; Cui, Y. F.; Liang, N.; Sun, P. P.; Chen, Q.; Li, B. L.; Li, H. Y. Structurally versatile cadmium coordination polymers based on bis(1,2,4-triazol)ethane and rigid aromatic multicarboxylates: syntheses, structures and properties. CrystEngComm. 2014, 16, (13) Wu, H.; Lu, X. L.; Yang, C. L.; Dong, C. X.; Wu, M. S. Diverse topologies of seven d 10 coordination polymers constructed from a long ligand and different carboxylates. CrystEngComm. 2014, 16, (14) Wang, X. L.; Zhao, D.; Tian, A. X.; Liu, G. G. Synthesis, crystal structure and property of a 3D octamolybdate coordination polymer based on nickel(ii)-bis(triazole) system. Chin. J. Inorg. Chem. 2013, 29, (15) Yang, Y.; Du, P.; Yang, J.; Kan, W. Q.; Ma, J. F. A series of Cu(II) and Cd(II) coordination polymers constructed by 3,5-dinitrosalicylic acid and flexible bis(triazole) ligands containing different spacers. CrystEngComm. 2013, 15, (16) Wang, X. L.; Mu, B.; Lin, H. Y.; Yang, S.; Liu, G. C.; Tian, A. X.; Zhang, J. W. Assembly and properties of transition-metal coordination polymers based on semi-rigid bis-pyridyl-bis-amide ligand: effect of polycarboxylates on the dimensionality. Dalton Trans. 2012, 41, (17) Farnum, G. A.; Pochodylo, A. L.; LaDuca, R. L. Tether length control of topology in cadmium 4-methyphthalate two-dimensional coordination polymers: an acentric buckled grid and a rare self-catenated layer. Cryst. Growth Des. 2011, 11, (18) Li, G. L.; Liu, G. Z.; Ma, L. F.; Xin, L. Y.; Li, X. L.; Wang, L. Y. Crystallographic determination of solid-state structural transformations in a dynamic metal-organic framework. Chem. Commun. 2014, 50, (19) Li, G. L.; Liu, G. Z.; Huang, L. L.; Li, Z. X. A novel 3D Cu(II) coordination polymer containing mixed ligands: synthesis, crystal structure and properties. Chin. J. Struct. Chem. 2014, 33, (20) Sheldrick, G. M. SHELXS 97, Program for the Solution of Crystal Structure. University of Göttingen, Germany 1997.

8 HAN M. L. et al.: Syntheses, Structures and Characteristics of Two New Cu(II) Coordination 550 Polymers Based on 4-tert-butyl-phthalate and Different Bis(1,2,4-triazol-1-yl) Co-Ligands No. 4 (21) Sheldrick, G. M. SHELXL 97, Program for the Crystal Structure Refinement. University of Göttingen, Germany (22) Zhu, X.; Wang, L. Y.; Liu, X. G.; Wang, J.; Li, B. L.; Li, H. Y. Structural versatility of seven copper(ii) coordination polymers constructed with the long flexible ligand 1,4-bis(1,2,4-triazol-1-yl)butane. CrystEngComm. 2011, 13, (23) Ma, L. F.; Meng, Q. L.; Li, C. P.; Wang, L. Y.; Du, M.; Liang, F. P. Delicate substituent effect of benzene-1,2,3-tricarboxyl tectons on structural assembly of unusual self-penetrating coordination frameworks. Cryst. Growth Des. 2010, 10, (24) Han, M. L.; Wang, J. G.; Ma, L. F.; Guo, H.; Wang, L. Y. Construction of Cd(II) coordination polymers based on R-isophthalate (R = -CH 3 or -OCH 3) and flexible N-donor co-ligands: syntheses, structures and photoluminescence. CrystEngComm. 2012, 14,

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