Tetraaza macrocyclic metal complexes containing a medium-sized chelate ring. 2. X-ray structural studies of trans-dichloro(1,4,7,10-tetraazacyclotetradecane)nickel(II) hydrate, (1,4,7,10-tetraazacyclopentadecane)nickel(II) perchlorate, and trans-dichloro(1,4,7,10-tetraazacyclohexadecane)nickel(II)

Sugimoto, Masako; Fujita, Junnosuke; Ito, Haruko; Toriumi, Koshiro; Ito, Tasuku

doi:10.1021/ic00148a021

Cited by 31 publications

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“…The access of a hydrogen atom was found also for the aliphatic macrocyclic complex [Ni(N 4 8)] 2ϩ (N 4 8 = 1,4,7,10-tetraazacyclopentadecane), where one of the hydrogen atoms of the 8-membered chelate ring is located just above the Ni 2ϩ ion at a distance of 2.31(6) Å. 16 This suggests the possibility of M ؒ ؒ ؒ H interactions which would be a kind of hydrogen bond involving the lone pair electrons in the d orbital. (Fig.…”

Section: Formation Of Composite Crystals and Their Structuresmentioning

confidence: 82%

Selective formation of integrated stacks of (α-diimine)(ethylenediamine)platinum(II) and neutral π systems of the phenanthrene type †

Kato

Takahashi

Sugimoto

et al. 2001

J. Chem. Soc., Dalton Trans.

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Section: Formation Of Composite Crystals and Their Structuresmentioning

confidence: 82%

Selective formation of integrated stacks of (α-diimine)(ethylenediamine)platinum(II) and neutral π systems of the phenanthrene type †

Kato

Takahashi

Sugimoto

et al. 2001

J. Chem. Soc., Dalton Trans.

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“…It is worth mentioning that five- and six-membered metal chelate rings are the most conventional ring systems in coordination chemistry insofar as they exhibit exceptional stablity , (for general consideration of the chelate effect, see refs − ). However, seven-, − eight- (in particular, having N ∩ N, ,,− P ∩ P, ,− S ∩ S, , Se ∩ Se, O ∩ O, − P ∩ O, and C ∩ O donor centers), − nine-, ,, ten-, eleven-, and twelve-membered and also complexes with trans-spanned ligands and large metallamacrocycles ,− , are also known, albeit they are still unusual rather than common.…”

Section: Resultsmentioning

confidence: 99%

A Novel Reactivity Mode for Metal-Activated Dialkylcyanamide Species: Addition ofN,N′-Diphenylguanidine to acis-(R₂NCN)₂Pt^IICenter Giving an Eight-Membered Chelated Platinaguanidine

et al. 2009

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The nucleophilic addition of N,N'-diphenylguanidine, HN=C(NHPh)(2) (DPG), to two adjacent dialkylcyanamide ligands in cis-[PtCl(2)(NCNR(2))(2)] (R = Me; R(2) = C(5)H(10), C(4)H(8)O) gives unusual eight-membered chelates [PtCl(2){NH=C(NR(2))N(Ph)C(=NH)N(Ph)C(NR(2))=NH}] (1-3) with trisguanidine as the cyclic ligand, in which the central guanidine =NH group remains uncoordinated. Treatment of trans-[PtCl(2)(NCNR(2))(2)] (R = R = Me; R(2) = C(5)H(10), C(4)H(8)O) with 1 equiv of HN=C(NHPh)(2) in a solution (R = R = Me; R(2) = C(5)H(10)) or in a suspension (R(2) = C(4)H(8)O) of CHCl(3) or MeNO(2) at 20-25 degrees C for 20 h results in the generation of the 1,3,5-triazapentadiene monochelates [PtCl{NH=C(NR(2))N(Ph)C(NH(2))=NPh}(NCNR(2))](Cl) (4-6). When any of trans-[PtCl(2)(NCNR(2))(2)] reacts with 2 equiv of DPG at 20-25 degrees C for 1-2 days or 4-6 are treated with 1 equiv more of HN=C(NHPh)(2) at the same temperature, the complexes bearing two chelate rings [Pt{NH=C(NR(2))N(Ph)C(NH(2))=NPh}(2)](Cl)(2) (7-9) are formed. The formulation of the obtained complexes was supported by satisfactory C, H, and N elemental analyses, agreeable ESI(+)-MS, IR and (1)H and (13)C{(1)H} NMR spectroscopies; the structures of 1 and 2 were determined by the single-crystal X-ray diffraction. Theoretical studies (at the B3LYP level of theory) revealed that the alkylnitrile eight-membered product is significantly less stable than the corresponding cyanamide species 1-3, and this fact, at least partially, explains why the former was not detected in the reaction between cis-dinitrileplatinum(II) complexes and DPG.

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“…The ligand bae is dianionic and tetradentate and forms a square planar nickel(II) complex (sum of bond angles 360.02(7)). The average Ni-N (1.86(2) Å ) bond distance is not significantly different from that in [Ni(Me 2 Ac 2 H 2 malen)] 2[15] {mean 1.836(5) Å } and falls in the order (1.86-1.94 Å ) normally observed for square planar nickel(II) complexes of tetaazamacrocycles[28][29][30]; the Ni-O distance, 1.849(14) Å is also the same as that in 2, 1.854(5) Å . The two NiNCCCO rings are coplanar and the nonplanar ethylenediamine ring adopts the usual gauche conformation consistent with the infrared data.…”

mentioning

confidence: 70%

Synthesis, Characterization and Crystal Structure of a Nickel(II) Schiff Base Complex Derived from Acetylacetone and Ethylenediamine

Gupta

Hitchcock

Kushwah

2002

Journal of Coordination Chemistry

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The square-planar nickel (II) complex of composition [Ni(bae)] Á 1 2 H 2 O (1) [where H 2 bae is bis(acetylacetone)ethylenediamine] has been synthesized by [2 þ 1] template condensation of acetylacetone and ethylenediamine in the presence of NiCl 2 Á 6H 2 O and characterized. An X-ray structure determination of the complex has been completed. Average Ni-N and Ni-O distances are, respectively, 1.86(2) Å and 1.849(14) Å . NÁ Á Á N bite distance and bite angle are 2.627(6) Å and 87.2(2) , respectively, for the fivemembered chelate ring. The water molecule forms hydrogen bonds with O atoms of two complex molecules.

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Tetraaza macrocyclic metal complexes containing a medium-sized chelate ring. 2. X-ray structural studies of trans-dichloro(1,4,7,10-tetraazacyclotetradecane)nickel(II) hydrate, (1,4,7,10-tetraazacyclopentadecane)nickel(II) perchlorate, and trans-dichloro(1,4,7,10-tetraazacyclohexadecane)nickel(II)

Cited by 31 publications

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Selective formation of integrated stacks of (α-diimine)(ethylenediamine)platinum(II) and neutral π systems of the phenanthrene type †

Selective formation of integrated stacks of (α-diimine)(ethylenediamine)platinum(II) and neutral π systems of the phenanthrene type †

A Novel Reactivity Mode for Metal-Activated Dialkylcyanamide Species: Addition ofN,N′-Diphenylguanidine to acis-(R₂NCN)₂Pt^IICenter Giving an Eight-Membered Chelated Platinaguanidine

Synthesis, Characterization and Crystal Structure of a Nickel(II) Schiff Base Complex Derived from Acetylacetone and Ethylenediamine

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Tetraaza macrocyclic metal complexes containing a medium-sized chelate ring. 2. X-ray structural studies of trans-dichloro(1,4,7,10-tetraazacyclotetradecane)nickel(II) hydrate, (1,4,7,10-tetraazacyclopentadecane)nickel(II) perchlorate, and trans-dichloro(1,4,7,10-tetraazacyclohexadecane)nickel(II)

Cited by 31 publications

References 0 publications

Selective formation of integrated stacks of (α-diimine)(ethylenediamine)platinum(II) and neutral π systems of the phenanthrene type †

Selective formation of integrated stacks of (α-diimine)(ethylenediamine)platinum(II) and neutral π systems of the phenanthrene type †

A Novel Reactivity Mode for Metal-Activated Dialkylcyanamide Species: Addition ofN,N′-Diphenylguanidine to acis-(R2NCN)2PtIICenter Giving an Eight-Membered Chelated Platinaguanidine

Synthesis, Characterization and Crystal Structure of a Nickel(II) Schiff Base Complex Derived from Acetylacetone and Ethylenediamine

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A Novel Reactivity Mode for Metal-Activated Dialkylcyanamide Species: Addition ofN,N′-Diphenylguanidine to acis-(R₂NCN)₂Pt^IICenter Giving an Eight-Membered Chelated Platinaguanidine