Honeycomb Nets with Interpenetrating Frameworks Involving Iminodiacetato-Copper(II) Blocks and Bipyridine Spacers: Syntheses, Characterization, and Magnetic Studies
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- 作者：Suman Mukhopadhyay ; Pabitra Baran Chatterjee ; Debdas Mandal ; Golam Mostafa ; Andrea Caneschi ; Joris van Slageren ; Timothy J. R. Weakley ; and Muktimoy Chaudhury
- 刊名：Inorganic Chemistry
- 出版年：2004
- 出版时间：May 31, 2004
- 年：2004
- 卷：43
- 期：11
- 页码：3413 - 3420
- 全文大小：294K
- 年卷期：v.43,no.11(May 31, 2004)
- ISSN：1520-510X
文摘
Three coordination polymers of copper(II), viz. {[Cu(ida)(4,4'-bipyH)]ClO4}
(1), {[Cu2(ida)2(
-4,4'-bipy)]·2H2O}(2), and [Cu2(ida)2(bpa)] (3) have been synthesized by the process of self-assembly using Cu(ida) [ida =iminodiacetate(2-)] as the building block and 4,4'-bipyridyl and 1,2-bis(4-pyridyl)ethane (bpa) as linkers. Crystals of1 are orthorhombic, of space group Pna21, with a = 13.8956(12) Å, b = 16.3362(16) Å, c = 7.3340(12), and Z= 4. Both compounds 2 and 3 crystallize in monoclinic space group P21/a with a = 10.1887(8) Å (9.6779(10) Åfor 3), b = 8.0008(11) Å (9.1718(10) Å), c = 11.6684(9) Å (12.9144(12) Å), 
= 98.307(11)
(102.796(18)), andZ = 2 (2). Compound 1 has a zigzag chain structure with an extensive hydrogen-bonded network while compounds2 and 3 are honeycomb (6,3) nets with interpenetrating structures. Variable temperature (2-300 K) magnetic studyindicates the presence of weak antiferromagnetic interactions (J = 0.82 ± 0.01 cm-1) in 1 and ferromagnetic in2 (J = -0.45 ± 0.05 cm-1) and 3 (J = -0.21 ± 0.02 cm-1). The extent of planarity of the bridging "Cu-O-C-O-Cu" moiety, acting as the super-exchange pathway between the neighboring copper centers, probably controlsthe sign of the magnetic exchange coupling in these compounds.
(1), {[Cu2(ida)2(-4,4'-bipy)]·2H2O}(2), and [Cu2(ida)2(bpa)] (3) have been synthesized by the process of self-assembly using Cu(ida) [ida =iminodiacetate(2-)] as the building block and 4,4'-bipyridyl and 1,2-bis(4-pyridyl)ethane (bpa) as linkers. Crystals of1 are orthorhombic, of space group Pna21, with a = 13.8956(12) Å, b = 16.3362(16) Å, c = 7.3340(12), and Z= 4. Both compounds 2 and 3 crystallize in monoclinic space group P21/a with a = 10.1887(8) Å (9.6779(10) Åfor 3), b = 8.0008(11) Å (9.1718(10) Å), c = 11.6684(9) Å (12.9144(12) Å), = 98.307(11) (102.796(18)), andZ = 2 (2). Compound 1 has a zigzag chain structure with an extensive hydrogen-bonded network while compounds2 and 3 are honeycomb (6,3) nets with interpenetrating structures. Variable temperature (2-300 K) magnetic studyindicates the presence of weak antiferromagnetic interactions (J = 0.82 ± 0.01 cm-1) in 1 and ferromagnetic in2 (J = -0.45 ± 0.05 cm-1) and 3 (J = -0.21 ± 0.02 cm-1). The extent of planarity of the bridging "Cu-O-C-O-Cu" moiety, acting as the super-exchange pathway between the neighboring copper centers, probably controlsthe sign of the magnetic exchange coupling in these compounds.