A new structural form for a decanuclear copper(ii) assembly

Chandrasekhar, Vadapalli; Nagarajan, Loganathan; Gopal, Kandasamy; Baskar, Viswanathan; Kögerler, Paul

doi:10.1039/b510145j

Cited by 57 publications

(20 citation statements)

References 34 publications

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“…[126] The use of more bulky pyrazole ligands (i.e. [141] The reaction of an iron(II) salt with the 3-(2-pyridyl)pyrazole ligand formed by the decomposition of the ligand tris[{3-(2- Figure 11. [127] The incorporation of other functional groups in the amino substituents of the pyrazole ring, such as imidazole (HL2j [125] and HL2l [128] ligands) or 1,4,7-triazacyclonanane (HL2m ligand), [129] has also been studied.…”

Section: Pyrazole Ligands With N-donor Substituents Aminesmentioning

confidence: 99%

Coordination Versatility of Pyrazole‐Based Ligands towards High‐Nuclearity Transition‐Metal and Rare‐Earth Clusters

et al. 2010

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Section: Pyrazole Ligands With N-donor Substituents Aminesmentioning

confidence: 99%

Coordination Versatility of Pyrazole‐Based Ligands towards High‐Nuclearity Transition‐Metal and Rare‐Earth Clusters

et al. 2010

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“…This may be due to the fact that metal phosphonates have very poor solubility, so that they are frequently found in polymeric coordination complexes rather than in cage complexes. [7] Several metal phosphonate clusters have been described in recent years, including iron, [7] zinc, [8][9][10][11][12] cadmium, [13] copper, [14,15] cobalt, [16,17] manganese, [18,19] gallium, [20] tin, [21] and vanadium [22] cages, all of which exhibit intriguing structures and properties. For example, Chandrasekhar and Kingsley re- 4 ]· 7 CH 3 OH (M = Cd 1, M= Zn 2).…”

Section: Introductionmentioning

confidence: 99%

Studies on Cage‐Type Tetranuclear Metal Clusters with Ferrocenylphosphonate Ligands

Zhang

et al. 2006

Chemistry A European J

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Reaction of FcCH(2)PO(3)H(2) [Fc=(eta(5)-C(5)H(5))Fe(eta(5)-C(5)H(4))] (H(2)FMPA) and 1,10-phenanthroline (phen) with Cd(OAc)(2).2 H(2)O or ZnSO(4).7 H(2)O in methanol in the presence of triethylamine resulted in the formation of two new ferrocenylphosphonate metal-cage complexes [M(4)(fmpa)(4)(phen)(4)] 7 CH(3)OH (M=Cd 1, M=Zn 2). Both structures contain two kinds of isomeric tetranuclear metal phosphonate cages, which are linked to one another by pi-pi interactions between the phen molecules. In 1, the Cd1, Cd3, and Cd4 atoms are all pentacoordinate, while the Cd2 atom is coordinated by four oxygen atoms from three phosphonate ligands and two nitrogen atoms from the chelating phen in a distorted octahedral geometry. Four Cd atoms from each unit are interconnected through bridging phosphonate ligands with different coordination modes, such as 5.221, 4.211, and 2.11 (Harris notation), yielding a {Cd(4)} cage. In 2, each Zn atom is coordinated by three oxygen atoms from three phosphonate ligands and two nitrogen atoms from phen, leading to a distorted square-pyramidal geometry. The four Zn atoms of each isomeric unit are also interconnected through four bridging phosphonate ligands to yield a {Zn(4)} cage. Fluorescent studies indicate that ligand-to-ligand charge-transfer photoluminescence is observed for 1, while the emission bands of 2 can be assigned to an admixture of ligand-to-ligand and metal-to-ligand charge transfer. Solution-state differential pulse voltammetry indicates that the half-wave potentials of the ferrocenyl moieties in 1 and 2 have different deviations relative to the relevant H(2)FMPA ligand. This may be because the highest occupied molecular orbital (HOMO) in 1 is located in the FMPA(2-) groups, while in 2 the HOMO is located in the phen and Zn(II) groups, so the Fe(II) centers in complex 1 are more easily oxidized to Fe(III) centers than those of 2. The third-order nonlinear optical (NLO) measurements show that both 1 and 2 exhibit strong third-order NLO self-focusing effects; hence, they are promising candidates for NLO materials. By calculating the component of the lowest unoccupied molecular orbitals of 1 and 2, we confirmed that the co-planar phen rings control their optical nonlinearity, while the H(2)FMPA ligands and metal ions have only a weak influence on their NLO properties.

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“…However, in 1997, Ward and co-workers (Jones et al, 1997) observed another coordination mode, where it acted as a tridentate bridging ligand via deprotonation of the pyrazole NH group and coordination of the pyrazole N atom to a second metal ion. The coordination chemistry of HL as a tridentate bridging ligand with Cu II cations has been studied by several researchers to date (Jeffery et al, 1997;Mann et al, 1999;Chandrasekhar et al, 2005;Hu et al, 2006), but to the best of our knowledge, only three structurally related Cu II complexes with deprotonated HL and aromatic acids have been reported (Hu et al, 2006).…”

Section: Commentmentioning

confidence: 99%

Controllable assembly of a three-dimensional metal–organic supramolecular framework including π–π stacking interactions

Hua

Guo

2012

Acta Crystallogr C

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The mixed-ligand metal-organic complex poly[(μ(3)-phthalato)[μ(2)-3-(pyridin-2-yl)-1H-pyrazol-1-ido]dicopper(II)], [Cu(2)(C(8)H(4)O(4))(C(8)H(6)N(3))(2)](n), has been synthesized by the reaction of copper(II) acetate with 2-(1H-pyrazol-3-yl)pyridine (HL) and phthalic acid. The binuclear chelating-bridging L units are further linked by bridging phthalate ligands into a two-dimensional network parallel to the (010) plane. The two-dimensional networks are extended into a three-dimensional supramolecular architecture via π-π stacking interactions.

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A new structural form for a decanuclear copper(ii) assembly

Cited by 57 publications

References 34 publications

Coordination Versatility of Pyrazole‐Based Ligands towards High‐Nuclearity Transition‐Metal and Rare‐Earth Clusters

Coordination Versatility of Pyrazole‐Based Ligands towards High‐Nuclearity Transition‐Metal and Rare‐Earth Clusters

Studies on Cage‐Type Tetranuclear Metal Clusters with Ferrocenylphosphonate Ligands

Controllable assembly of a three-dimensional metal–organic supramolecular framework including π–π stacking interactions

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