A new carbonate bridged tetranuclear zinc(ii) complex of an asymmetric tetrapodal compartmental ligand

Adams, Harry; Bradshaw, Darren; Fenton, David E.

doi:10.1039/b108432c

Cited by 30 publications

(18 citation statements)

References 18 publications

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“…The distortion from the ideal trigonal bipyramidal around the zinc centers is particularly reflected in the bond angles of N(1)–Zn–O(6), O(3)–Zn(1)–N(1) and O(1)–Zn(1)–O(5) at 171.57(7)°, 81.04(7)°, and 101.00(7)°, respectively. As presented in Table 2, most of the observed metric values for the complex are well within the range of previously reported similar di -zinc(II) complexes in the literature [44,77]. However, the observed Zn(II)---Zn(II) distance in the complex is slightly longer than bond distances reported for similar di -nuclear zinc(II) complex in the literature [33,45,78–81].…”

Section: Resultssupporting

confidence: 87%

“…Furthermore, the biologically relevant aspects of carbohydrate complexes of Fe 3+ , Cr 3+ , VO 2+ , and Zn 2+ , have also been reported [32–35,37–43]. It has also been elucidated that carboxylato-bridged dinuclear complexes of Mg 2+ , Mn 2+ , Co 2+ , Ni 2+ , and Zn 2+ , are involved in non-redox active enzymatic processes [33,44–51]. …”

Section: Introductionmentioning

confidence: 99%

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Synthesis, crystal structure and investigation of mononuclear copper(II) and zinc(II) complexes of a new carboxylate rich tripodal ligand and their interaction with carbohydrates in alkaline aqueous solution

Stewart

Pedraza

Arman

et al. 2015

Journal of Inorganic Biochemistry

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A new carboxylate rich asymmetric tripodal ligand, N-[2-carboxybenzomethyl]-N-[carboxymethyl]-β-alanine (H3camb), and its di-copper(II), (NH4)2[1]2, and di-zinc(II), ((CH3)4 N)2[2]2, complexes have been synthesized as carbohydrate binding models in aqueous solutions. The ligand and complexes have been fully characterized using several techniques, including single crystal X-ray diffraction. The interactions of (NH4)2[1]2 and ((CH3)4 N)2[2]2 with D-glucose, D-mannose, D-xylose and xylitol in aqueous alkaline media were investigated using UV–Vis and 13C-NMR spectroscopic techniques, respectively. The molar conductance, NMR and ESI–MS studies indicate that the complexes dissociate in solution to produce the respective complex anions, 1− and 2−. Complexes 1− and 2− showed chelating ability towards the naturally abundant and biologically relevant sugars, D-glucose, D-mannose, D-xylose, and xylitol. The complex ions bind to one molar equivalent of the sugars, even in the presence of stoichiometric excess of the substrates, in solution. Experimentally obtained spectroscopic data and computational results suggest that the substrates bind to the metal center in a bidentate fashion. Apparent binding constant values, pKapp, between the complexes and the substrates were determined and a specific mode of substrate binding is proposed. The pKapp and relativistic density functional theory (DFT) calculated Gibbs free energy values indicate that D-mannose displayed the strongest interaction with the complexes. Syntheses, characterizations, detailed substrate binding studies using spectroscopic techniques, single crystal X-ray diffraction and geometry optimizations of the complex-substrates with DFT calculations are also reported.

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Section: Resultssupporting

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Synthesis, crystal structure and investigation of mononuclear copper(II) and zinc(II) complexes of a new carboxylate rich tripodal ligand and their interaction with carbohydrates in alkaline aqueous solution

Stewart

Pedraza

Arman

et al. 2015

Journal of Inorganic Biochemistry

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“…The Zn—O alkoxide , Zn—O carboxylate , and Zn—N amine bond distances are comparable to the values reported for some alkoxide-bridged di- and polynuclear zinc complexes. 41−45…”

Section: Resultsmentioning

confidence: 99%

Inorganic Phosphate and Arsenate within New Tetranuclear Copper and Zinc Complexes: Syntheses, Crystal Structures, Magnetic, Electrochemical, and Thermal Studies

et al. 2017

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Three, PO 4 3– /HPO 4 2– and AsO 4 3– -incorporated, new tetranuclear complexes of copper(II) and zinc(II) ions have been synthesized and fully characterized. In methanol–water, reactions of H 3 cpdp (H 3 cpdp = N , N ′-Bis[2-carboxybenzomethyl]- N , N ′-Bis[2-pyridylmethyl]-1,3-diaminopropan-2-ol) with copper(II) chloride in the presence of either NaOH/Na 2 HPO 4 ·2H 2 O or KOH/Na 2 HAsO 4 ·7H 2 O lead to the isolation of the tetranuclear complexes Na 3 [Cu 4 (cpdp) 2 (μ 4 -PO 4 )](OH) 2 ·14H 2 O ( 1 ) and K 2 [Cu 4 (cpdp) 2 (μ 4 -AsO 4 )](OH)·16 2 / 3 H 2 O ( 2 ), respectively. Similarly, the reaction of H 3 cpdp with zinc(II) chloride in the presence of NaOH/Na 2 HPO 4 ·2H 2 O yields a tetranuclear complex, Na(H 3 O) 2 [Zn 4 (cpdp) 2 (μ 4 -HPO 4 )]Cl 3 ·12 1 / 2 H 2 O ( 3 ). All complexes are characterized by single-crystal X-ray diffraction and other analytical techniques, such as Fourier transform infrared and UV−vis spectroscopy, thermogravimetric and electrochemical studies. The solid-state molecular framework of each complex contains two monocationic [M 2 (cpdp)] + (M = Cu, Zn) units, which are exclusively coordinated to either phosphate/hydrogen phosphate or arsenate groups in a unique mode. All three complexes exhibit a μ 4 :η 1 :η 1 :η 1 :η 1 bridging mode of the PO 4 3– /HPO 4 2– /AsO 4 3– groups, with each bridging among four metal ions. The thermal properties of all three complexes have been investigated by thermogravimetric analysis. Low-temperature magnetic studies of complexes 1 and 2 disclose moderate antiferromagnetic interactions mediated among the copper centers through alkoxi...

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“…The observation of coordination asymmetry in both of these Zn(II) complexes formed by the T 2 PrO − ligand would suggest that this ligand has some influence as a determinant of the geometries of the Zn(II) centres. Despite the rarity of simple Zn(II) complexes exhibiting coordination asymmetry, [5][6][7][8] such a feature is quite common for Zn(II) centres found at the active sites of enzymes. 9 This somewhat unexpected structural feature of complexes formed by T 2 PrO − led us to explore the Ni(II) complexes formed by T 2 PrO − and the protonated form, T 2 PrOH.…”

Section: Introductionmentioning

confidence: 99%

Coordinative flexibility of 1,2-bis[1,4,7-triazacyclonon-1-yl]propan-2-ol in mononuclear and binuclear Ni(ii) complexes

et al. 2004

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T h i s j o u r n a l i s © T h e R o y a l S o c i e t y o f C h e m i s t r y 2 0 0 4 2 3 0 9 D a l t o n T r a n s . , 2 0 0 4 , 2 3 0 9 -2 3 1 3 Dalton www.rsc.org/dalton F U L L P A P E R O (3). In the mononuclear complex (1), the 2-propanol group connecting the two 1,4,7-trizacyclononane (tacn) rings is protonated, the six nitrogen donors from the T 2 PrOH ligand coordinating to a single Ni(II) centre in a distorted octahedral geometry. In the binuclear complexes (2) and (3), three coordination sites on each distorted octahedral Ni(II) centre are occupied fac by three nitrogen donors from the one tacn ring, the two metal centres being linked by an endogenous alkoxo bridge. A notable common feature of the two identical cations of (2) and (3) is that for one Ni(II) centre the remaining two sites are occupied by two water ligands, while in the other a bromo ligand replaces one ligated water. Similar binuclear systems have been recently defined [Zn 2 (T 2 PrO)X(H 2 O) 2 ](ClO 4 ) 2 (X = Cl, Br), two complexes that exhibit coordination asymmetry with one pseudo-octahedral and one pseudo-square pyramidal Zn(II) centre. The weak antiferromagnetic coupling in 2 and 3 is discussed and compared to di-phenoxo-bridged Ni(II) examples.

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A new carbonate bridged tetranuclear zinc(ii) complex of an asymmetric tetrapodal compartmental ligand

Cited by 30 publications

References 18 publications

Synthesis, crystal structure and investigation of mononuclear copper(II) and zinc(II) complexes of a new carboxylate rich tripodal ligand and their interaction with carbohydrates in alkaline aqueous solution

Synthesis, crystal structure and investigation of mononuclear copper(II) and zinc(II) complexes of a new carboxylate rich tripodal ligand and their interaction with carbohydrates in alkaline aqueous solution

Inorganic Phosphate and Arsenate within New Tetranuclear Copper and Zinc Complexes: Syntheses, Crystal Structures, Magnetic, Electrochemical, and Thermal Studies

Coordinative flexibility of 1,2-bis[1,4,7-triazacyclonon-1-yl]propan-2-ol in mononuclear and binuclear Ni(ii) complexes

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