Chlorido(pyridine-2-carboximidamide-κ2N1,N2)zinc(II) chloride dihydrate

Dong, Guang-Hua; Xue, Ruide; Li, Jing

doi:10.1107/s1600536810045848

Cited by 3 publications

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References 2 publications

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“…Interestingly, although PyAm is commercially available as a hydrochloric salt, 1 – 5 represent the first structurally characterized Ln(III) complexes coordinated to 2-amidinopyridine. There is only one coordination complex reported in the literature to date with the PyAm ligand in its neutral form, mononuclear [ZnCl(PyAm) 2 ]Cl·2H 2 O, and the ligand PyAm was prepared in situ through the reaction of 2-cyanopyridine with LiN(SiMe 3 ) 2 in the presence of ZnCl 2 . In the complexes reported here, which are isomorphous and crystallize in monoclinic space group P 2 1 / n , the lanthanide ion is coordinated to one PyAm ligand, which acts as an N–N bidentate chelate through the pyridyl N1 and iminic N2 atoms.…”

Section: Resultsmentioning

confidence: 99%

Stark Sublevel-Based Thermometry with Tb(III) and Dy(III) Complexes Cosensitized via the 2-Amidinopyridine Ligand

et al. 2020

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Amidine-based ligand frameworks were employed to isolate a series of mononuclear lanthanide complexes. The employed N-2-pyridylimidoyl-2-pyridylamidine (Py2ImAm) undergoes metal-assisted hydrolysis yielding the ligand 2-amidinopyridine (PyAm), which coordinates to the lanthanide ions affording [Ln(acac)3(PyAm)], where Ln = Eu(III) (1), Gd(III) (2), Tb(III) (3), Dy(III) (4) along with the Y(III) analogue (5). The Eu(III), Tb(III), and Dy(III) congeners exhibit characteristic emissions of red, green, and yellow light, respectively, with emission quantum yields of 3, 65, and 8%, respectively. Due to changes in the thermal population of the Stark sublevels, the Tb(III) and Dy(III) complexes can be used as efficient optical thermometers with maximum relative sensitivities of 1.57 and 2.03% K–1 for 3 and 4, respectively. These results demonstrate the viability of PyAm as an antenna for the sensitization of lanthanide ions.

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Section: Resultsmentioning

confidence: 99%

Stark Sublevel-Based Thermometry with Tb(III) and Dy(III) Complexes Cosensitized via the 2-Amidinopyridine Ligand

et al. 2020

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Structure and biological evaluation of pyridine-2-carboxamidine copper(II) complex resulting from N′-(4-nitrophenylsulfonyloxy)2-pyridine-carboxamidoxime

Perontsis

Geromichalos

Pekou

et al. 2020

Journal of Inorganic Biochemistry

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A Series of Zinc Mononuclear Complexes with Imidoyl Amidine Ligands: Syntheses, Crystal Structures, and Photoluminescence Properties

Nijhuis,

Yamba,

Novikov

et al. 2024

Chemistry

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Three amidine-based ligands were used in the crystal design of a series of mononuclear Zn(II) complexes. Interaction of zinc chloride, ZnCl2, with N-2-pyridylimidoyl-2-pyridylamidine (Py2ImAm) resulted in complexes [Zn(Py2ImAm)2] (1) and [ZnCl2(Py2ImAm)] (2). In [Zn(Py2ImAm)2] (1, monoclinic, P21/c), the metal ion was coordinated with the bidentate pocket of the anionic form of Py2ImAm, while in [ZnCl2(Py2ImAm)] (2, monoclinic, P21/n), the tridentate coordination to a neutral Py2ImAm was completed by two chloride anions. This structural variation was achieved by a pH-controlling strategy using the weak base triethylamine (TEA). Otherwise, three ionic complexes were obtained with 2-amidinopyridine (PyAm) and Zinc(II), [ZnCl(PyAm)2]Cl (3, triclinic, P-1), [ZnCl(PyAm)2]2[ZnCl4]·C2H5OH (4, monoclinic, P21/n), and [ZnCl(PyAm)2]2Cl·CH3OH (5, triclinic, P-1). They comprised the same [ZnCl(PyAm)2]+ monocation with a butterfly-like shape provided by the bidentate chelate coordination of two PyAm neutral entities and a chloride ligand. In a similar butterfly shape, ionic complex [ZnCl(PmAm)2]2[ZnCl4] (6, monoclinic, C2/c) comprised the mononuclear [ZnCl(PmAm)2]+ cations with two bidentate chelate-coordinated 2-amidinopyrimidine (PmAm) as neutral ligands. The Zn(II) pentacoordinated arrangement in 3–6 was variable, from square pyramidal to trigonal bipyramidal. The reported compounds’ synthetic protocols, crystal structures and photoluminescence properties are discussed.

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Chlorido(pyridine-2-carboximidamide-κ²N¹,N²)zinc(II) chloride dihydrate

Cited by 3 publications

References 2 publications

Stark Sublevel-Based Thermometry with Tb(III) and Dy(III) Complexes Cosensitized via the 2-Amidinopyridine Ligand

Stark Sublevel-Based Thermometry with Tb(III) and Dy(III) Complexes Cosensitized via the 2-Amidinopyridine Ligand

Structure and biological evaluation of pyridine-2-carboxamidine copper(II) complex resulting from N′-(4-nitrophenylsulfonyloxy)2-pyridine-carboxamidoxime

A Series of Zinc Mononuclear Complexes with Imidoyl Amidine Ligands: Syntheses, Crystal Structures, and Photoluminescence Properties

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