Synthesis, structure, and thermal behavior of discrete Co(II), Ag(I), and Pd(II) complexes with 2,3-bis(2-pyridyl)quinoxaline. Insight into coordination modes

Ok Sang Jung; Sung Ho Park; Yun Ju Kim; Young A. Lee; Ho G. Jang; Uk Lee

doi:10.1016/S0020-1693(00)00346-7

Synthesis, structure, and thermal behavior of discrete Co(II), Ag(I), and Pd(II) complexes with 2,3-bis(2-pyridyl)quinoxaline. Insight into coordination modes

Ok Sang Jung^*
, Sung Ho Park
, Yun Ju Kim
, Young A. Lee
, Ho G. Jang
, Uk Lee

^*Corresponding author for this work

Department of Chemistry

Korea Institute of Science and Technology
Korea University
Pukyong National University

Research output: Contribution to journal › Journal article › peer-review

25 Scopus citations

Abstract

The reactions of 2,3-bis(2-pyridyl)quinoxaline (bpq) with CoCl₂·6H₂O, Ag(CH₃CN)₄)BF₄, and PdCl₂(C₆H₅CN)₂ produce [CoCl₂(bpq)]₂·2CHCl₃, [Ag(bpq)CH₃CN]₂(BF₄)₂· 2CH₃CN, and [PdCl₂(bpq)], respectively. All the products are discrete 1:1 (metal:bpq) adducts, where the chelation mode of the bpq is dependent upon the metal atoms. The structure of [CoCl₂(bpq)]₂·2CHCl₃ is a centrosymmetric Cl-bridged four-membered dimer, [Co₂Cl₂], in which the bpq is bonded to the cobalt(II) atom in an anisobidentate mode with the nitrogen donors of pyridine and pyrazine rings. For [Ag(bpq)CH₃CN]₂(BF₄)₂· 2CH₃CN, each bpq ligand connects two tetrahedral silver(I) ions in a tridentate mode, resulting in a cationic cyclic dimer. The structure of [PdCl₂(bpq)] approximates to a molecular rocking chair with an isobidentate bpq through the nitrogen donors of 2-pyridyl rings. The compounds exhibit significant and characteristic relationships between the structures and their thermal properties. For [CoCl₂(bpq)]₂·2CHCl₃, the solvate chloroform molecules are safely contained up to 144°C, but drastically evaporate above this temperature. The striking feature of [Ag(bpq)CH₃CN]₂(BF₄)₂· 2CH₃CN is that the skeletal cyclic dimer is basically retained after dissociation of the coordinated acetonitriles in the solid state.

Original language	English
Pages (from-to)	93-99
Number of pages	7
Journal	Inorganica Chimica Acta
Volume	312
Issue number	1-2
DOIs	https://doi.org/10.1016/S0020-1693(00)00346-7
State	Published - 2001.01.29

Keywords

2,3-Bis(2-pyridyl)quinoxaline complexes
Crystal structures
Thermal properties

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10.1016/S0020-1693(00)00346-7

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@article{abc64da363c24dcc8804045499e8cc16,

title = "Synthesis, structure, and thermal behavior of discrete Co(II), Ag(I), and Pd(II) complexes with 2,3-bis(2-pyridyl)quinoxaline. Insight into coordination modes",

abstract = "The reactions of 2,3-bis(2-pyridyl)quinoxaline (bpq) with CoCl2·6H2O, Ag(CH3CN)4)BF4, and PdCl2(C6H5CN)2 produce [CoCl2(bpq)]2·2CHCl3, [Ag(bpq)CH3CN]2(BF4)2· 2CH3CN, and [PdCl2(bpq)], respectively. All the products are discrete 1:1 (metal:bpq) adducts, where the chelation mode of the bpq is dependent upon the metal atoms. The structure of [CoCl2(bpq)]2·2CHCl3 is a centrosymmetric Cl-bridged four-membered dimer, [Co2Cl2], in which the bpq is bonded to the cobalt(II) atom in an anisobidentate mode with the nitrogen donors of pyridine and pyrazine rings. For [Ag(bpq)CH3CN]2(BF4)2· 2CH3CN, each bpq ligand connects two tetrahedral silver(I) ions in a tridentate mode, resulting in a cationic cyclic dimer. The structure of [PdCl2(bpq)] approximates to a molecular rocking chair with an isobidentate bpq through the nitrogen donors of 2-pyridyl rings. The compounds exhibit significant and characteristic relationships between the structures and their thermal properties. For [CoCl2(bpq)]2·2CHCl3, the solvate chloroform molecules are safely contained up to 144°C, but drastically evaporate above this temperature. The striking feature of [Ag(bpq)CH3CN]2(BF4)2· 2CH3CN is that the skeletal cyclic dimer is basically retained after dissociation of the coordinated acetonitriles in the solid state.",

keywords = "2,3-Bis(2-pyridyl)quinoxaline complexes, Crystal structures, Thermal properties",

author = "Jung, \{Ok Sang\} and Park, \{Sung Ho\} and Kim, \{Yun Ju\} and Lee, \{Young A.\} and Jang, \{Ho G.\} and Uk Lee",

year = "2001",

month = jan,

day = "29",

doi = "10.1016/S0020-1693(00)00346-7",

language = "English",

volume = "312",

pages = "93--99",

journal = "Inorganica Chimica Acta",

issn = "0020-1693",

number = "1-2",

}

TY - JOUR

T1 - Synthesis, structure, and thermal behavior of discrete Co(II), Ag(I), and Pd(II) complexes with 2,3-bis(2-pyridyl)quinoxaline. Insight into coordination modes

AU - Jung, Ok Sang

AU - Park, Sung Ho

AU - Kim, Yun Ju

AU - Lee, Young A.

AU - Jang, Ho G.

AU - Lee, Uk

PY - 2001/1/29

Y1 - 2001/1/29

N2 - The reactions of 2,3-bis(2-pyridyl)quinoxaline (bpq) with CoCl2·6H2O, Ag(CH3CN)4)BF4, and PdCl2(C6H5CN)2 produce [CoCl2(bpq)]2·2CHCl3, [Ag(bpq)CH3CN]2(BF4)2· 2CH3CN, and [PdCl2(bpq)], respectively. All the products are discrete 1:1 (metal:bpq) adducts, where the chelation mode of the bpq is dependent upon the metal atoms. The structure of [CoCl2(bpq)]2·2CHCl3 is a centrosymmetric Cl-bridged four-membered dimer, [Co2Cl2], in which the bpq is bonded to the cobalt(II) atom in an anisobidentate mode with the nitrogen donors of pyridine and pyrazine rings. For [Ag(bpq)CH3CN]2(BF4)2· 2CH3CN, each bpq ligand connects two tetrahedral silver(I) ions in a tridentate mode, resulting in a cationic cyclic dimer. The structure of [PdCl2(bpq)] approximates to a molecular rocking chair with an isobidentate bpq through the nitrogen donors of 2-pyridyl rings. The compounds exhibit significant and characteristic relationships between the structures and their thermal properties. For [CoCl2(bpq)]2·2CHCl3, the solvate chloroform molecules are safely contained up to 144°C, but drastically evaporate above this temperature. The striking feature of [Ag(bpq)CH3CN]2(BF4)2· 2CH3CN is that the skeletal cyclic dimer is basically retained after dissociation of the coordinated acetonitriles in the solid state.

AB - The reactions of 2,3-bis(2-pyridyl)quinoxaline (bpq) with CoCl2·6H2O, Ag(CH3CN)4)BF4, and PdCl2(C6H5CN)2 produce [CoCl2(bpq)]2·2CHCl3, [Ag(bpq)CH3CN]2(BF4)2· 2CH3CN, and [PdCl2(bpq)], respectively. All the products are discrete 1:1 (metal:bpq) adducts, where the chelation mode of the bpq is dependent upon the metal atoms. The structure of [CoCl2(bpq)]2·2CHCl3 is a centrosymmetric Cl-bridged four-membered dimer, [Co2Cl2], in which the bpq is bonded to the cobalt(II) atom in an anisobidentate mode with the nitrogen donors of pyridine and pyrazine rings. For [Ag(bpq)CH3CN]2(BF4)2· 2CH3CN, each bpq ligand connects two tetrahedral silver(I) ions in a tridentate mode, resulting in a cationic cyclic dimer. The structure of [PdCl2(bpq)] approximates to a molecular rocking chair with an isobidentate bpq through the nitrogen donors of 2-pyridyl rings. The compounds exhibit significant and characteristic relationships between the structures and their thermal properties. For [CoCl2(bpq)]2·2CHCl3, the solvate chloroform molecules are safely contained up to 144°C, but drastically evaporate above this temperature. The striking feature of [Ag(bpq)CH3CN]2(BF4)2· 2CH3CN is that the skeletal cyclic dimer is basically retained after dissociation of the coordinated acetonitriles in the solid state.

KW - 2,3-Bis(2-pyridyl)quinoxaline complexes

KW - Crystal structures

KW - Thermal properties

UR - https://www.scopus.com/pages/publications/0035966475

U2 - 10.1016/S0020-1693(00)00346-7

DO - 10.1016/S0020-1693(00)00346-7

M3 - Journal article

AN - SCOPUS:0035966475

SN - 0020-1693

VL - 312

SP - 93

EP - 99

JO - Inorganica Chimica Acta

JF - Inorganica Chimica Acta

IS - 1-2

ER -

Synthesis, structure, and thermal behavior of discrete Co(II), Ag(I), and Pd(II) complexes with 2,3-bis(2-pyridyl)quinoxaline. Insight into coordination modes

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Keywords

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