1,2,4-Triazole complexes. XV. The structure of tetraaquasulphato(1,2,4-triazole)manganese(II)

Gorter, S.; Engelfriet, D. W.

doi:10.1107/s0567740881005530

Cited by 24 publications

(8 citation statements)

References 15 publications

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“…From the O-ligated water molecules the hydrogen atoms (which were not determined unequivocally but which were placed at calculated positions) are positioned nonsymmetrically above and below the metal coordination planes in the direction of the O atom of the OSO 2 CF 3 anions. The S-O bonds of the anions involved in hydrogen bonding (1.448(3) and 1.443(3) Å) are significantly longer than the other S−O bonds of 1.428(3) Å; such differences in S−O bond lengths have been observed and accounted for earlier …”

Section: Resultsmentioning

confidence: 91%

Comparative Rates of Ligand Substitution Reactions of Pt−C-Bonded Complexes in Aqueous Solution and the X-ray Crystal Structure of [Pt{C₆H₃(CH₂NMe₂)₂-2,6}(OH₂)][OSO₂CF₃]

et al. 1996

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The substitution behavior of the organometallic complex cation [Pt{C 6 H 3 (CH 2 NMe 2 ) 2 -2,6}-(OH 2 )] + (1) has been studied with a series of nucleophiles (Cl -, Br -, I -, N 3 -, NCS -, thiourea, N, N′-dimethylthiourea, N,N,N′N′-tetramethylthiourea) as a function of nucleophile concentration ([Nu]), pH, temperature, and pressure. Complex 1 affords pseudo-first-order rate constants, k obs , for the complex-formation reaction given by k obs ) k 1 [Nu] + k -1 ; the k -1 term is due to the reverse aquation reaction and is insignificant for the stronger, S-donor nucleophiles. The mechanism for the substitution of the coordinated water molecule is associative, as demonstrated by the large negative values of ∆S q and ∆V q . The results are compared to those obtained earlier for the geometrically related neutral zwitterionic complex [Pt{C 6 H 4 (CH 2 NMe 2 )-2}(NC 5 H 4 SO 3 -3)(OH 2 )] (2). Both cyclometalated complexes 1 and 2 have very high substitution reactivities that can be ascribed to labilization which arises from the σ-bonded carbon atom of the ortho-metalated aryl ligand in combination with back-bonding to the in-plane aryl ligand that increases the electrophilic character of the Pt(II) center. In complex 1 the σ-donicity of the second chelating dimethylamine group and/or the increased chelation effect of the tridentate ligand lead to a significantly increased lability of the coordinated water molecule, compared to complex 2. The X-ray structure of the ionic complex [Pt{C 6 H 3 (CH 2 NMe 2 ) 2 -2,6}(OH 2 )] + [OSO 2 CF 3 ] -(1a) is described. The crystal structure comprises an aggregate of two complex cations and two triflate anions. The structure contains two fully equivalent square-planar coordinated Pt(II) centers with an O-ligated neutral H 2 O molecule (Pt-O ) 2.186 (2) Å) trans to the Pt-C aryl bond (Pt-C ) 1.903(2) Å); the aggregate results from the involvement of both H atoms of the two H 2 O molecules in asymmetric hydrogen bonding to O atoms of the two triflate anions.

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Section: Resultsmentioning

confidence: 91%

Comparative Rates of Ligand Substitution Reactions of Pt−C-Bonded Complexes in Aqueous Solution and the X-ray Crystal Structure of [Pt{C₆H₃(CH₂NMe₂)₂-2,6}(OH₂)][OSO₂CF₃]

et al. 1996

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“…More than 200 X-ray diffraction structures are well documented, of them only 10% concern the metal complexes of the unsubstituted 1,2,4-triazole. This behaves as monodentate ligand coordinating to the first row or second row transition metal ion through N4 ([Mn II (SO 4 )(Htrz)(H 2 O) 4 ], [Cd(NCS) 2 (Htrz) 2 ], [FeCl 3 (bpy)(Htrz)], or Zn(II) in human carbonic anhydrase) when neutral or via N1 ([Au(trz)(PPh 3 )] 2 , [PhC(CH 3 ) 2 CH 2 ] 3 Sn(trz)) when deprotonated. exo -Didentate linking of metal ions through two nonadjacent nitrogens is a feature of both triazole and triazolate ligands.…”

Section: Resultsmentioning

confidence: 99%

Synthesis, X-ray Diffraction Structures, Spectroscopic Properties, and in vitro Antitumor Activity of Isomeric (1H-1,2,4-Triazole)Ru(III) Complexes

Arion

Reisner²,

Fremuth

et al. 2003

Inorg. Chem.

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Three ruthenium(III) complexes containing 1H-1,2,4-triazole (Htrz), viz., (H(2)trz)[cis-RuCl(4)(Htrz)(2)], 1, (H(2)trz)[trans-RuCl(4)(Htrz)(2)], 2, and (Ph(3)PCH(2)Ph)[trans-RuCl(4)(Htrz)(2)], 3, have been synthesized by reaction between RuCl(3) and excess of the triazole in 2.38 M HCl (1 and 2), while 3 was obtained by metathesis of 2 and [Ph(3)PCH(2)Ph]Cl in water. The products were characterized by IR, UV-vis, electrospray mass spectrometry, cyclic voltammetry, and X-ray crystallography (1 and 3). X-ray diffraction study revealed cis and trans arrangements of the triazole ligands in 1 and 3, correspondingly, and unprecedented monodentate coordination of the triazole through N2 and stabilization of its 4H tautomeric form, which is the disfavored one for the free triazole. The cytotoxicity of 1 and 2 has been assayed in three human carcinoma cell lines SW480, HT29 (colon carcinoma), and SK-BR-3 (mammary carcinoma). Both compounds exhibit antiproliferative activity in vitro. Time-dependent response of all three lines to 1 and 2 and a structure-activity relationship, i.e., higher activity of the trans-isomer 2 than that of cis-species 1, have been observed.

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“…, 1,2,4-triazole (C) (Deuschl, 1965) and Mn(trz). SO4.4H20 (D) (Gorter & Engelfriet, 1981) A, B 1 and D are non-bridging monodentate triazole groups; B2 is a bridging triazole group. by the metal ion.…”

mentioning

confidence: 99%

Structure of bis(4-tert-butyl-1,2,4-triazole-N1)bis(isothiocyanato)zinc(II)

Groeneveld¹,

Vos²,

Gorter³

et al. 1982

Acta Crystallogr Sect B

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1,2,4-Triazole complexes. XV. The structure of tetraaquasulphato(1,2,4-triazole)manganese(II)

Cited by 24 publications

References 15 publications

Comparative Rates of Ligand Substitution Reactions of Pt−C-Bonded Complexes in Aqueous Solution and the X-ray Crystal Structure of [Pt{C₆H₃(CH₂NMe₂)₂-2,6}(OH₂)][OSO₂CF₃]

Comparative Rates of Ligand Substitution Reactions of Pt−C-Bonded Complexes in Aqueous Solution and the X-ray Crystal Structure of [Pt{C₆H₃(CH₂NMe₂)₂-2,6}(OH₂)][OSO₂CF₃]

Synthesis, X-ray Diffraction Structures, Spectroscopic Properties, and in vitro Antitumor Activity of Isomeric (1H-1,2,4-Triazole)Ru(III) Complexes

Structure of bis(4-tert-butyl-1,2,4-triazole-N1)bis(isothiocyanato)zinc(II)

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1,2,4-Triazole complexes. XV. The structure of tetraaquasulphato(1,2,4-triazole)manganese(II)

Cited by 24 publications

References 15 publications

Comparative Rates of Ligand Substitution Reactions of Pt−C-Bonded Complexes in Aqueous Solution and the X-ray Crystal Structure of [Pt{C6H3(CH2NMe2)2-2,6}(OH2)][OSO2CF3]

Comparative Rates of Ligand Substitution Reactions of Pt−C-Bonded Complexes in Aqueous Solution and the X-ray Crystal Structure of [Pt{C6H3(CH2NMe2)2-2,6}(OH2)][OSO2CF3]

Synthesis, X-ray Diffraction Structures, Spectroscopic Properties, and in vitro Antitumor Activity of Isomeric (1H-1,2,4-Triazole)Ru(III) Complexes

Structure of bis(4-tert-butyl-1,2,4-triazole-N1)bis(isothiocyanato)zinc(II)

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Comparative Rates of Ligand Substitution Reactions of Pt−C-Bonded Complexes in Aqueous Solution and the X-ray Crystal Structure of [Pt{C₆H₃(CH₂NMe₂)₂-2,6}(OH₂)][OSO₂CF₃]

Comparative Rates of Ligand Substitution Reactions of Pt−C-Bonded Complexes in Aqueous Solution and the X-ray Crystal Structure of [Pt{C₆H₃(CH₂NMe₂)₂-2,6}(OH₂)][OSO₂CF₃]