Synthesis and Crystal Structure of Two Succinato-Bridged Macrocyclic Nickel(II) Complexes
01 Jan 2013-Zeitschrift für anorganische und allgemeine Chemie (WILEY‐VCH Verlag)-Vol. 639, Iss: 1, pp 158-162
TL;DR: Two dinuclear succinato-bridged nickel(II) complexes were synthesized and characterized by EA, Circular dichroism (CD), as well as IR and UV/Vis spectroscopy as discussed by the authors.
Abstract: Two dinuclear succinato-bridged nickel(II) complexes [Ni(RR-L)]2(μ-SA)(ClO4)2 (1) and [Ni(SS-L)]2(μ-SA)(ClO4)2 (2) (L = 5, 5, 7, 12, 12, 14-hexamethyl-1, 4, 8, 11-tetraazacyclotetradecane, SA = succinic acid) were synthesized and characterized by EA, Circular dichroism (CD), as well as IR and UV/Vis spectroscopy Single crystal X-ray diffraction analyses revealed that the NiII atoms display a distorted octahedral coordination arrangement, and the succinato ligand bridges two central NiII atoms in a bis bidentate fashion to form dimers in 1 and 2 The monomers of {[Ni(RR-L)]2(μ-SA)}2+ and {[Ni(SS-L)]2(μ-SA)}2+ are connected by O–H···O and N–H···O hydrogen bonds into a 1D right-handed and left-handed helical chain along the b axis, respectively The homochiral natures of 1 and 2 are confirmed by the results of CD spectroscopy
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TL;DR: In this article, three dinuclear compounds of the types [Mn2(L1)2(μ-ap)(H2O)2](X)2·MeOH·2H 2O [X,=",PF6− (1), BF4− (2)] and [Ni 2(L2)2 (μ-suc)](PF6)2
11 citations
TL;DR: In this paper, the reaction of a racemic four-coordinate Ni(II) complex [Ni(rac-L)](ClO4)2 with l- and d-alanine in acetonitrile/water gave two sixcoordinate enantiomers formulated as Ni(RR-L)(l-Ala) and ClO4·2CH3CN, respectively.
Abstract: The reactions of a racemic four-coordinate Ni(II) complex [Ni(rac-L)](ClO4)2 with l- and d-alanine in acetonitrile/water gave two six-coordinate enantiomers formulated as [Ni(RR-L)(l-Ala)](ClO4)·2CH3CN (1) and [Ni(SS-L)(d-Ala)](ClO4) (2) (L = 5,5,7,12,12,14-hexamethyl-1,4,8,11-tetraazacyclo-tetradecane, Ala− = alanine anion), respectively. Evaporation from the remaining solutions gave two four-coordinate enantiomers characterized as [Ni(SS-L)](ClO4)2 (S-3) and [Ni(RR-L)](ClO4)2 (R-3), respectively. Single-crystal X-ray diffraction analyses of complexes 1 and 2 revealed that the Ni(II) atom has a distorted octahedral coordination geometry, being coordinated by four nitrogen atoms of L in a folded configuration, plus one carboxylate oxygen atom and one nitrogen atom of l- or d-Ala− in mutually cis-positions. Complexes 1 and 2 are supramolecular stereoisomers, constructed via hydrogen bonding between [Ni(RR-L)(l-Ala)]+ or [Ni(SS-L)(d-Ala)]+ monomers to form 1D hydrogen-bonded zigzag chains. The homochiral natures of complexes 1 and 2 have been confirmed by CD spectroscopy.
8 citations
TL;DR: A nickel-II coordination polymer of succinic acid (1,4-butanedioic acid, H2succ), [Ni(succ)(H2O)4]n (1), was prepared and characterized in depth using IR and Raman spectroscopic methods and theore...
Abstract: A nickel(II) coordination polymer of succinic acid (1,4-butanedioic acid, H2succ), [Ni(succ)(H2O)4]n (1), was prepared and characterized in depth using IR and Raman spectroscopic methods and theore...
6 citations
TL;DR: In this article, three dinuclear isophthalato-bridged nickel(II) complexes formulated as [Ni(rac-L)]2(μ-IPA)(ClO4)2 (1), [NiRR-L]2(mipa)(clO 4 )2 (2) and [NiSS-L], 2(mIPA(clO4), 3 (3) have been isolated and characterized.
Abstract: Three dinuclear isophthalato-bridged nickel(II) complexes formulated as [Ni(rac-L)]2(μ-IPA)(ClO4)2 (1), [Ni(RR-L)]2(μ-IPA)(ClO4)2 (2) and [Ni(SS-L)]2(μ-IPA)(ClO4)2 (3) (L = 5,5,7,12,12,14-hexamethyl-1,4,8,11-tetraazacyc-lotetradecane, IPA = isophthalic acid) have been isolated and characterized. Single crystal X-ray diffraction analyses revealed that the Ni(II) atoms have six-coordinated distorted octahedral environments, and the isophthalato ligand bridges two Ni(II) centres in a bis bidentate fashion to form dimers in all three complexes. The monomers of {[Ni(SS-L)]2(μ-IPA)} 2+ are connected through intermolecular hydrogen bonds to generate one-dimensional left-handed helical chains in complex 3. The homochiral natures of complexes 2and3have been confirmed by CD spectroscopy.
1 citations
TL;DR: In this article, the macrocyclic nickel(II) complexes can easily take up and fix atmospheric CO2 at room temperature, and the chiral nature of complex 2 has been confirmed by CD spectroscopy.
Abstract: Two dinuclear carbonato-bridged nickel(II) complexes formulated as [Ni(rac-L)]2(µ-CO3)(H2O)(im)4(ClO4)2 (1) and [Ni(SS-L)]2(µ-CO3)(H2O)(im)4(ClO4)2 (2) (L = 5,5,7,12,12,14-hexamethyl-1,4,8,11-tetraazacyclotetradecane, im = imidazole) were isolated from the reactions of [Ni(rac-L)](ClO4)2 and [Ni(SS-L)](ClO4)2 with imidazole in the air, respectively, and a hydrocarbonato-coordinated nickel(II) complex formulated as [Ni(rac-L)](HCO3)(ClO4) (3) was reacted with obtained when [Ni(rac-L)](ClO4)2 reacted with l-cysteine under weakly basic conditions in the air. We found that the macrocyclic nickel(II) complexes can easily take up and fix atmospheric CO2 at room temperature. Single-crystal X-ray diffraction analyses revealed of all three complexes that the central Ni(II) atoms all have a six-coordinated distorted octahedral coordination geometry, and the carbonate anion bridges two Ni(II) atoms in a tridentate fashion to form dimers in complexes 1 and 2, and the hydrocarbonate coordinates with Ni(II) in a didentate fashion in complex 3. The monomers of {[Ni(RR-L)]2(µ-CO3)(H2O)}2+/{[Ni(SS-L)]2(µ-CO3)(H2O)}2+ are connected through hydrogen bonds to generate one-dimensional right- and left-handed helical chains in complex 1. The chiral nature of complex 2 has been confirmed by CD spectroscopy.
1 citations
References
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TL;DR: The dinuclear terephthalato-bridged nickel(II) complexes [Ni2(cyclen)2(μ-tp)](ClO4)2 (1) [Ni 2(trpn), trpn, tp-carboxylate-oxygen]-(3-aminopropyl)amine and 3,3,3-tet, trpn or trpn/tetraazacyclododecane, were synthesized and structurally characterized by X-ray crystallography as discussed by the authors.
28 citations
TL;DR: Two binuclear compounds [Ni 2 (pmdtn) 2 (tp) 2 ](ClO 4 ) 2 (H 2 O) 4 ( 1 ) and [Ni 3 (n 3 ) 2 ][Ni 4 O] 4 ( 2 ) have been characterized by X-ray crystallography and magnetic measurements as mentioned in this paper.
27 citations
TL;DR: In this article, the reaction of tris(2-pyridylmethyl)amine (TPyA)/N, N-bis(2pyrinylmethyl)-2-aminoethanol (bpaeOH), H2DHBN/Na2C2O4/NaN3 and Fe(II/III) ions in MeOH leads to the isolation of three iron(III) dimeric complexes, namely, [(TPYA)(DHBN)FeIIIOFeIII(TPy A)(DHBN)]·2H
22 citations
TL;DR: In this paper, a series of dinuclear oxalato-bridged copper(II) and nickel (II) complexes derived from tridentate amines were synthesized and structurally characterized by X-ray crystallography.
20 citations
TL;DR: A new pyridylpyrazole-containing tetradentate ligand, namely N,N-bis(3,5-dimethylpyrazol-1-ylmethyl)aminomethylpyridine (L), and two of its binuclear azido-bridged complexes, [Ni2(L)2(N3)2]2]-ClO4)2·2EtOH (1) and [Cu2L) 2(N 3]2
Abstract: A new pyridylpyrazole-containing tetradentate ligand, namely N,N-bis(3,5-dimethylpyrazol-1-ylmethyl)aminomethylpyridine (L), and two of its binuclear azido-bridged complexes, [Ni2(L)2(N3)2](ClO4)2·2EtOH (1) and [Cu2(L)2(N3)2](ClO4)2 (2), have been synthesized and characterized by physico-chemical and spectroscopic methods. The crystal structures of both complexes are reported. Each metal atom in the complexes has a MN6 coordination environment with distorted octahedral geometry. Variable-temperature magnetic susceptibility measurements for complex (1) show typical antiferromagnetic behavior with J value −84.5 ± 1.3 cm−1, whereas complex (2) has no magnetic interactions.
17 citations