Synthesis, spectroscopic and X-ray crystal studies of mixed-chelate copper(II) complexes containing a novel β-diketonate ligand

Lim, Yau Yan; Chen, W.; Tan, L.L.; Lim, Kuan‐Hon

doi:10.1016/s0277-5387(00)88150-4

Cited by 4 publications

(1 citation statement)

References 13 publications

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“…The CuÐO bonds in (Ic) are also equal in length, albeit signi®cantly shorter than those observed in (Ib). Comparable equivalent and non-equivalent CuÐO bonds have been observed in related copper±tropolonate complexes (Hasegawa et al, 1997;Chipper®eld et al, 1998) and in copper complexes involving -or -hydroxy ketone ligands (Lim et al, 1994;Odoko et al, 2002). The OÐCuÐO bite angles for the chelating hinokitiolate ligands in all three polymorphs are also statistically equivalent.…”

Section: Commentmentioning

confidence: 88%

Two new polymorphs oftrans-bis(hinokitiolato)copper(II)

Arvanitis¹,

Berardini²,

Ho³

2004

Acta Crystallogr C

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The title complex [systematic name: trans-bis(3-isopropyl-7-oxocyclohepta-1,3,5-trienolato)copper(II)], [Cu(C10H11O2)2], is a substance possessing antimicrobial activity. The compound crystallizes in a number of polymorphic forms, the structures for two of which are reported here. Stacks of square-planar molecules exhibiting weak intermolecular copper-olefin pi interactions (not observed in earlier reports on this substance) are described. The molecules have crystallographically imposed inversion symmetry, with stacking and copper-olefin pi distances ranging from 3.226 (2) to 3.336 (1) A.

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Section: Commentmentioning

confidence: 88%

Two new polymorphs oftrans-bis(hinokitiolato)copper(II)

Arvanitis¹,

Berardini²,

Ho³

2004

Acta Crystallogr C

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X-ray crystal, magnetic and spectroscopic studies of dicopper mixed-ligand complexes containing bridged bis(β-diketonate) and tetramethylethylenediamine ligands

et al. 1994

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The impact of ionic liquids on the coordination of anions with solvatochromic copper complexes

et al. 2017

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Solvatochromic transition metal (TM)-complexes with weakly associating counter-anions are often used to evaluate traditional neutral solvent and anion coordination ability. However, when employed in ionic liquids (IL) many of the common assumptions made are no longer reliable. This study investigates the coordinating ability of weakly coordinating IL anions in traditional solvents and within IL solvents employing a range of solvatochromic copper complexes. Complexes of the form [Cu(acac)(tmen)][X] (acac = acetylacetonate, tmen = tetramethylethylenediamine) where [X] = [ClO], Cl, [NO], [SCN], [OTf], [NTf] and [PF] have been synthesised and characterised both experimentally and computationally. ILs based on these anions and imidazolium and pyrrolidinium cations, some of which are functionalised with hydroxyl and nitrile groups, have been examined. IL-anion coordination has been investigated and compared to typical weakly coordinating anions. We have found there is potential for competition at the Cu-centre and cases of anions traditionally assigned as weakly associating that demonstrate a stronger than expected level of coordinating ability within ILs. [Cu(acac)(tmen)][PF] is shown to contain the least coordinating anion and is established as the most sensitive probe studied here. Using this probe, the donor numbers (DNs) of ILs have been determined. Relative donor ability is further confirmed based on the UV-Vis of a neutral complex, [Cu(sacsac)] (sacsac = dithioacetylacetone), and DNs evaluated viaNa NMR spectroscopy. We demonstrate that ILs can span a wide donor range, similar in breadth to conventional solvents.

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Synthesis, spectroscopic and X-ray crystal studies of mixed-chelate copper(II) complexes containing a novel β-diketonate ligand

Cited by 4 publications

References 13 publications

Two new polymorphs oftrans-bis(hinokitiolato)copper(II)

Two new polymorphs oftrans-bis(hinokitiolato)copper(II)

X-ray crystal, magnetic and spectroscopic studies of dicopper mixed-ligand complexes containing bridged bis(β-diketonate) and tetramethylethylenediamine ligands

The impact of ionic liquids on the coordination of anions with solvatochromic copper complexes

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