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Shuvaev KV, Abedin TSM, McClary CA, Dawe LN, Collins JL, Thompson LK. Ligand directed self-assembly vs. metal ion coordination algorithm—when does the ligand or the metal take control? Dalton Trans 2009:2926-39. [DOI: 10.1039/b818939k] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Dawe LN, Abedin TSM, Thompson LK. Liganddirected self-assembly of polymetallic [n × n] grids: rational routes to large functional molecular subunits? Dalton Trans 2008:1661-75. [DOI: 10.1039/b716114j] [Citation(s) in RCA: 96] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Shuvaev KV, Decken A, Grein F, Abedin TSM, Thompson LK, Passmore J. NC–(CF2)4–CNSSN˙ containing 1,2,3,5-dithiadiazolyl radical dimer exhibiting triplet excited states at low temperature and thermal hysteresis on melting–solidification: structural, spectroscopic, and magnetic characterization. Dalton Trans 2008:4029-37. [DOI: 10.1039/b804699a] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Niel V, Milway VA, Dawe LN, Grove H, Tandon SS, Abedin TSM, Kelly TL, Spencer EC, Howard JAK, Collins JL, Miller DO, Thompson LK. Coordination “Oligomers” in Self-Assembly Reactions of Some “Tritopic” Picolinic Dihydrazone LigandsMononuclear, Dinuclear, Hexanuclear, Heptanuclear, and Nonanuclear Examples. Inorg Chem 2007; 47:176-89. [DOI: 10.1021/ic7016787] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Virginie Niel
- Department of Chemistry, Memorial University, St. John's, Newfoundland A1B 3X7, Canada, University of Durham, South Road, Durham DH1 3LE, U.K., and Kent State University, Salem Campus, Salem, Ohio 44460
| | - Victoria A. Milway
- Department of Chemistry, Memorial University, St. John's, Newfoundland A1B 3X7, Canada, University of Durham, South Road, Durham DH1 3LE, U.K., and Kent State University, Salem Campus, Salem, Ohio 44460
| | - Louise N. Dawe
- Department of Chemistry, Memorial University, St. John's, Newfoundland A1B 3X7, Canada, University of Durham, South Road, Durham DH1 3LE, U.K., and Kent State University, Salem Campus, Salem, Ohio 44460
| | - Hilde Grove
- Department of Chemistry, Memorial University, St. John's, Newfoundland A1B 3X7, Canada, University of Durham, South Road, Durham DH1 3LE, U.K., and Kent State University, Salem Campus, Salem, Ohio 44460
| | - Santokh S. Tandon
- Department of Chemistry, Memorial University, St. John's, Newfoundland A1B 3X7, Canada, University of Durham, South Road, Durham DH1 3LE, U.K., and Kent State University, Salem Campus, Salem, Ohio 44460
| | - Tareque S. M. Abedin
- Department of Chemistry, Memorial University, St. John's, Newfoundland A1B 3X7, Canada, University of Durham, South Road, Durham DH1 3LE, U.K., and Kent State University, Salem Campus, Salem, Ohio 44460
| | - Timothy L. Kelly
- Department of Chemistry, Memorial University, St. John's, Newfoundland A1B 3X7, Canada, University of Durham, South Road, Durham DH1 3LE, U.K., and Kent State University, Salem Campus, Salem, Ohio 44460
| | - Elinor C. Spencer
- Department of Chemistry, Memorial University, St. John's, Newfoundland A1B 3X7, Canada, University of Durham, South Road, Durham DH1 3LE, U.K., and Kent State University, Salem Campus, Salem, Ohio 44460
| | - Judith A. K. Howard
- Department of Chemistry, Memorial University, St. John's, Newfoundland A1B 3X7, Canada, University of Durham, South Road, Durham DH1 3LE, U.K., and Kent State University, Salem Campus, Salem, Ohio 44460
| | - Julie L. Collins
- Department of Chemistry, Memorial University, St. John's, Newfoundland A1B 3X7, Canada, University of Durham, South Road, Durham DH1 3LE, U.K., and Kent State University, Salem Campus, Salem, Ohio 44460
| | - David O. Miller
- Department of Chemistry, Memorial University, St. John's, Newfoundland A1B 3X7, Canada, University of Durham, South Road, Durham DH1 3LE, U.K., and Kent State University, Salem Campus, Salem, Ohio 44460
| | - Laurence K. Thompson
- Department of Chemistry, Memorial University, St. John's, Newfoundland A1B 3X7, Canada, University of Durham, South Road, Durham DH1 3LE, U.K., and Kent State University, Salem Campus, Salem, Ohio 44460
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Dey SK, Abedin TSM, Dawe LN, Tandon SS, Collins JL, Thompson LK, Postnikov AV, Alam MS, Müller P. Supramolecular Self-Assembled Polynuclear Complexes from Tritopic, Tetratopic, and Pentatopic Ligands: Structural, Magnetic and Surface Studies. Inorg Chem 2007; 46:7767-81. [PMID: 17696336 DOI: 10.1021/ic070336a] [Citation(s) in RCA: 90] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Polymetallic, highly organized molecular architectures can be created by "bottom-up" self-assembly methods using ligands with appropriately programmed coordination information. Ligands based on 2,6-picolyldihydrazone (tritopic and pentatopic) and 3,6-pyridazinedihydrazone (tetratopic) cores, with tridentate coordination pockets, are highly specific and lead to the efficient self-assembly of square [3 x 3] Mn9, [4 x 4] Mn16, and [5 x 5] Mn25 nanoscale grids. Subtle changes in the tritopic ligand composition to include bulky end groups can lead to a rectangular 3 x [1 x 3] Mn9 grid, while changing the central pyridazine to a more sterically demanding pyrazole leads to simple dinuclear copper complexes, despite the potential for binding four metal ions. The creation of all bidentate sites in a tetratopic pyridazine ligand leads to a dramatically different spiral Mn4 strand. Single-crystal X-ray structural data show metallic connectivity through both mu-O and mu-NN bridges, which leads to dominant intramolecular antiferromagnetic spin exchange in all cases. Surface depositions of the Mn9, Mn16, and Mn25 square grid molecules on graphite (HOPG) have been examined using STM/CITS imagery (scanning tunneling microscopy/current imaging tunneling spectroscopy), where tunneling through the metal d-orbital-based HOMO levels reveals the metal ion positions. CITS imagery of the grids clearly shows the presence of 9, 16, and 25 manganese ions in the expected square grid arrangements, highlighting the importance and power of this technique in establishing the molecular nature of the surface adsorbed species. Nanoscale, electronically functional, polymetallic assemblies of this sort, created by such a bottom-up synthetic approach, constitute important components for advanced molecule-based materials.
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Affiliation(s)
- Subrata K Dey
- Department of Chemistry, Memorial University, St. John's, Newfoundland, A1B 3X7, Canada
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Dawe LN, Abedin TSM, Kelly TL, Thompson LK, Miller DO, Zhao L, Wilson C, Leech MA, Howard JAK. Self-assembled polymetallic square grids ([2 × 2] M4, [3 × 3] M9) and trigonal bipyramidal clusters (M5)—structural and magnetic properties. ACTA ACUST UNITED AC 2006. [DOI: 10.1039/b602595a] [Citation(s) in RCA: 68] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Abstract
An oxalic dihydrazide based flexible polydentate amidrazone ligand undergoes spontaneous [2 x 2] grid assembly, followed by partial disassembly, and then reassembly in the presence of Co(NO3)2.6H2O and NH4(NCS) to form a unique octanuclear [Co(II)2-Co(III)2]2 interlocked, single braided 4 + 4 [2]catenane.
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Affiliation(s)
- Tareque S M Abedin
- Department of Chemistry, Memorial University, St. John's, NL, Canada A1B 3X7
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Grove H, Kelly TL, Thompson LK, Zhao L, Xu Z, Abedin TSM, Miller DO, Goeta AE, Wilson C, Howard JAK. Copper(II) complexes of a series of alkoxy diazine ligands: mononuclear, dinuclear, and tetranuclear examples with structural, magnetic, and DFT studies. Inorg Chem 2004; 43:4278-88. [PMID: 15236541 DOI: 10.1021/ic040036i] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Picolyl hydrazide ligands have two potentially bridging functional groups (micro-O, micro-N-N) and consequently can exist in different coordination conformers, both of which form spin-coupled polynuclear coordination complexes, with quite different magnetic properties. The complex [Cu(2)(POAP-H)Br(3)(H(2)O)] (1) involves a micro-N-N bridge (Cu-N-N-Cu 150.6 degrees ) and exhibits quite strong antiferromagnetic coupling (-2J = 246(1) cm(-)(1)). [Cu(2)(PZOAPZ-H)Br(3)(H(2)O)(2)] (2) has two Cu(II) centers bridged by an alkoxide group with a very large Cu-O-Cu angle of 141.7 degrees but unexpectedly exhibits quite weak antiferromagnetic exchange (-2J = 91.5 cm(-)(1)). This is much weaker than anticipated, despite direct overlap of the copper magnetic orbitals. Density functional calculations have been carried out on compound 2, yielding a similar singlet-triplet splitting energy. Structural details are reported for [Cu(2)(POAP-H)Br(3)(H(2)O)] (1), [Cu(2)(PZOAPZ-H)Br(3)(H(2)O)(2)] (2), [Cu(2)(PAOPF-2H)Br(2)(DMSO)(H(2)O)].H(2)O (3), [Cu(4)(POMP-H))(4)](NO(3))(4).2H(2)O (4), and PPOCCO (5) (a picolyl hydrazide ligand with a terminal oxime group) and its mononuclear complexes [Cu(PPOCCO-H)(NO(3))] (6) and [Cu(PPOCCO-H)Cl] (7). Compound 1 (C(12)H(13)Br(3)Cu(2)N(5)O(4)) crystallizes in the monoclinic system, space group P2(1)/c, with a = 15.1465(3) A, b = 18.1848(12) A, c = 6.8557(5) A, beta = 92.751(4) degrees, and Z = 4. Compound 2 (C(10)H(13)Br(3)Cu(2)N(7)O(4)) crystallizes in the triclinic system, space group P, with a = 9.14130(1) A, b = 10.4723(1) A, c = 10.9411(1) A, alpha = 100.769(1), beta = 106.271(1) degrees, gamma = 103.447(1) degrees, and Z = 2. Compound 3 (C(23)H(22)Br(2)Cu(2)N(7)O(5.5)S) crystallizes in the monoclinic system, space group P2(1)/c, with a = 12.406(2) A, b = 22.157(3) A, c = 10.704(2) A, beta = 106.21(1) degrees, and Z = 4. Compound 4(C(52)H(48)Cu(4)N(20)O(18)) crystallizes in the monoclinic system, space group P2(1)/n, with a = 14.4439(6) A, b = 12.8079(5) A, c = 16.4240(7) A, beta = 105.199(1) degrees, and Z = 4. Compound 5 (C(15)H(14)N(4)O(2)) crystallizes in the orthorhombic system, space group Pna2(1), with a = 7.834(3) A, b = 11.797(4) A, c = 15.281(3) A, and Z = 4. Compound 6(C(15)H(13)CuN(5)O(5)) crystallizes in the monoclinic system, space group P2(1)/c, with a = 8.2818(9) A, b = 17.886(2) A, c = 10.828(1) A, beta = 92.734(2) degrees, and Z = 4. Compound 7 (C(15)H(13)CuClN(4)O(2)) crystallizes in the orthorhombic system, space group Pna2(1), with a = 7.9487(6) A, b = 14.3336(10) A, c = 13.0014(9) A, and Z = 4. Density functional calculations on PPOCCO are examined in relation to the anti-eclipsed conformational change that occurs on coordination to copper(II).
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Affiliation(s)
- Hilde Grove
- Department of Chemistry, Memorial University, St. John's, Newfoundland A1B 3X7, Canada
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Zhao L, Xu Z, Grove H, Milway VA, Dawe LN, Abedin TSM, Thompson LK, Kelly TL, Harvey RG, Miller DO, Weeks L, Shapter JG, Pope KJ. Supramolecular Mn(II) and Mn(II)/Mn(III) Grid Complexes with [Mn9(μ2-O)12] Core Structures. Structural, Magnetic, and Redox Properties and Surface Studies. Inorg Chem 2004; 43:3812-24. [PMID: 15206861 DOI: 10.1021/ic030319v] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A series of [3 x 3] Mn(II)(9), antiferromagnetically coupled, alkoxide-bridged, square grid complexes, derived from a group of "tritopic" dihydrazide ligands, is described. The outer ring of eight Mn(II) centers in the grids is isolated magnetically from the central Mn(II) ion, leading to an S = 0 ground state for the ring, and an S = 5/2 ground state overall in each case. Exchange in the Mn(II)(8) ring can be represented by a 1D chain exchange model. Rich electrochemistry displayed by these systems has led to the production of Mn(II)/Mn(III) mixed-oxidation-state grids by both electrochemical and chemical means. Structures are reported for [Mn(9)(2poap)(6)](C(2)N(3))(6).10H(2)O (1), [Mn(9)(2poap)(6)](2)[Mn(NCS)(4)(H(2)O)](2)(NCS)(8).10H(2)O (2), [Mn(9)(2poapz)(6)](NO(3))(6).14.5H(2)O (3), [Mn(9)(2popp)(6)](NO(3))(6).12H(2)O (4), [Mn(9)(2pomp)(6)](MnCl(4))(2)Cl(2).2CH(3)OH.7H(2)O (5), and [Mn(9)(Cl2poap)(6)](ClO(4))(9).7H(2)O (6). Compound 1 crystallized in the tetragonal system, space group P4(2)/n, with a = 21.568(1) A, c = 16.275(1) A, and Z = 2. Compound 2 crystallized in the triclinic system, space group P, with a = 25.043(1) A, b = 27.413(1) A, c = 27.538(2) A, alpha = 91.586(2) degrees, beta = 113.9200(9) degrees, gamma = 111.9470(8) degrees, and Z = 2. Compound 3 crystallized in the triclinic system, space group P, with a = 18.1578(12) A, b = 18.2887(12) A, c = 26.764(2) A, alpha = 105.7880(12) degrees, beta = 101.547(2) degrees, gamma = 91.1250(11) degrees, and Z = 2. Compound 4 crystallized in the tetragonal system, space group P4(1)2(1)2, with a = 20.279(1) A, c = 54.873(6) A, and Z = 4. Compound 5 crystallized in the tetragonal system, space group I, with a = 18.2700(2) A, c = 26.753(2) A, and Z = 2. Compound 6 crystallized in the triclinic system, space group P, with a = 19.044(2) A, b = 19.457(2) A, c = 23.978(3) A, alpha = 84.518(3) degrees, beta = 81.227(3) degrees, gamma = 60.954(2) degrees, and Z = 2. Preliminary surface studies on Au(111), with a Mn(II) grid complex derived from a sulfur-derivatized ligand, indicate monolayer coverage via gold-sulfur interactions, and the potential for information storage at high-density levels.
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Affiliation(s)
- Liang Zhao
- Department of Chemistry, Memorial University, St. John's, Newfoundland A1B 3X7, Canada
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Milway VA, Niel V, Abedin TSM, Xu Z, Thompson LK, Grove H, Miller DO, Parsons SR. Octanuclear and Nonanuclear Supramolecular Copper(II) Complexes with Linear “Tritopic” Ligands: Structural and Magnetic Studies. Inorg Chem 2004; 43:1874-84. [PMID: 15018506 DOI: 10.1021/ic030113u] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The structures and magnetic properties of self-assembled copper(II) clusters and grids with the "tritopic" ligands 2poap (a), Cl2poap (b), m2poap (c), Cl2pomp (d), and 2pomp (e) are described [ligands derived by reaction of 4-R-2,6-pyridinedicarboxylic hydrazide (R = H, Cl, MeO) with 2-pyridinemethylimidate (a-c, respectively) or 2-acetylpyridine (d, R = Cl; e, R = H)]. Cl2poap and Cl2pomp self-assemble with Cu(NO(3))(2) to form octanuclear "pinwheel" cluster complexes [Cu(8)(Cl2poap-2H)(4)(NO(3))(8)].20H(2)O (1) and [Cu(8)(Cl2pomp-2H)(4)(NO(3))(8)].15H(2)O (2), built on a square [2 x 2] grid with four pendant copper arms, using "mild" reaction conditions. Similar reactions of Cl2pomp and 2pomp with Cu(ClO(4))(2) produce pinwheel clusters [Cu(8)(Cl2pomp-2H)(4)(H(2)O)(8)](ClO(4))(8).7H(2)O (3) and [Cu(8)(2pomp-2H)(4)(H(2)O)(8)](ClO(4))(8) (4), respectively. Heating a solution of 1 in MeOH/H(2)O produces a [3 x 3] nonanuclear square grid complex, [Cu(9)(Cl2poap-H)(3)(Cl2poap-2H)(3)](NO(3))(9).18H(2)O (5), which is also produced by direct reaction of the ligand and metal salt under similar conditions. Reaction of m2poap with Cu(NO(3))(2) produces only the [3 x 3] grid [Cu(9)(m2poap-H)(2)(m2poap-2H)(4)](NO(3))(8).17H(2)O (6) under similar conditions. Mixing the tritopic ligand 2poap with pyridine-2,6-dicarboxylic acid (picd) in the presence of Cu(NO(3))(2) produces a remarkable mixed ligand, nonanuclear grid complex [Cu(9)(2poap-H)(4)(picd-H)(3)(picd-2H)](NO(3))(9).9H(2)O (7), in which aromatic pi-stacking interactions are important in stabilizing the structure. Complexes 1-3 and 5-7 involve single oxygen atom (alkoxide) bridging connections between adjacent copper centers, while complex 4 has an unprecedented mixed micro-(N-N) and micro-O metal ion connectivity. Compound 1 (C(76)H(92)N(44)Cu(8)O(50)Cl(4)) crystallizes in the tetragonal system, space group I, with a = 21.645(1) A, c = 12.950(1) A, and Z = 2. Compound 2 (C(84)H(88)N(36)O(44)Cl(4)Cu(8)) crystallizes in the tetragonal system, space group I, with a = 21.2562(8) A, c = 12.7583(9) A, and Z = 2. Compound 4 (C(84)H(120)N(28)O(66)Cl(8)Cu(8)) crystallizes in the tetragonal system, space group I4(1)/a, with a = 20.7790(4) A, c = 32.561(1) A, and Z = 4. Compound 7(C(104)H(104)N(46)O(56)Cu(9)) crystallizes in the triclinic system, space group P, with a = 15.473(1) A, b = 19.869(2) A, c = 23.083(2) A, alpha = 88.890(2) degrees, beta = 81.511(2) degrees, gamma = 68.607(1) degrees, and Z = 2. All complexes exhibit dominant intramolecular ferromagnetic exchange coupling, resulting from an orthogonal bridging arrangement within each polynuclear structure.
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Affiliation(s)
- Victoria A Milway
- Department of Chemistry, Memorial University of Newfoundland, St. John's, Newfoundland A1B 3X7, Canada
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Abedin TSM, Thompson LK, Miller DO, Krupicka E. Structural and magnetic properties of a self-assembled spheroidal triakonta-hexanuclear Cu36 cluster. Chem Commun (Camb) 2003:708-9. [PMID: 12703784 DOI: 10.1039/b211401c] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An extended tritopic picolinic dihydrazide ligand with terminal oxime groups (dpocco) undergoes spontaneous self-assembly in the presence of copper acetate to produce a unique Cu36 cluster exhibiting intramolecular anti-ferromagnetic exchange.
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Affiliation(s)
- Tareque S M Abedin
- Deparment of Chemistry, Memorial University, St. John's, NL, Canada A1B 3X7
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