Synthesis and X-ray Powder Structures of Nickel(II) and Copper(II) Coordination Polymers with 2,5-Bis(2-pyridyl)pyrazine
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- 作者：Antonia Neels ; Bernard Mathez Neels ; Helen Stoeckli-Evans ; Abraham Clearfield ; and Damodara M. Poojary
- 刊名：Inorganic Chemistry
- 出版年：1997
- 出版时间：July 30, 1997
- 年：1997
- 卷：36
- 期：16
- 页码：3402 - 3409
- 全文大小：178K
- 年卷期：v.36,no.16(July 30, 1997)
- ISSN：1520-510X
文摘
The reaction of 2,5-bis(2-pyridyl)pyrazine (bppz) withnickel(II) sulfate in aqueous solution yielded abinuclearcomplex,[Ni2(bppz)(H2O)8](SO4)2·2H2O(1), whose structure was solved by single-crystalmethods. The compoundcrystallizes in the monoclinic space groupP21/n with a =8.372(2) Å, b = 18.301(2) Å, c =17.197(2) Å, 
=97.54(2)
, and Z = 4. The bppz ligand chelatesthe two octahedrally coordinated nickel atoms through itsnitrogendonors. The four remaining coordination sites are occupied bywater oxygen atoms. The binuclear[Ni2(bppz)(H2O)8]4+ cations are heldtogether by hydrogen bonds involving sulfate anions and watermolecules. Similarreactions with nickel(II) or copper(II) chloride in lesspolar solvents resulted in the formation of two newcoordination polymers,{[Ni2Cl2(bppz)(H2O)2(CH3OH)2]Cl2}n(2) and[Cu2Cl4(bppz)]n(3). These polymers couldbe obtained only in microcrystalline form. Their structures weredetermined ab initio from X-ray powderdiffractiondata. The complex{[Ni2Cl2(bppz)(H2O)2(CH3OH)2]Cl2}n(2) belongs to the triclinic space groupP
with a =8.7014(4) Å, b = 10.1465(5) Å, c= 8.0303(3) Å, 
= 116.095(2), =112.713(3), 
= 64.056(3), and Z=1. The octahedral coordination of the nickel atom is achieved bytwo nitrogens of the ligand bppz, two chlorideions, and two oxygens from the solvent molecules. The bridgingnature of the chloride ions and the bis-bidentateligands (bppz) leads to a one-dimensional polymer. The compound[Cu2Cl4(bppz)]n(3) crystallizes in themonoclinic space group C2/m with a =13.9124(5) Å, b = 6.1844(2) Å, c= 10.1572(3) Å, = 112.952(3), andZ = 2. The copper atoms display a distortedoctahedral geometry where four of the coordination sites areoccupiedby chloride ions and the remaining two by nitrogen atoms of bppz.The metal atoms are bridged by two chlorineatoms and the bppz ligands, forming a two-dimensional coordinationpolymer.
=97.54(2), and Z = 4. The bppz ligand chelatesthe two octahedrally coordinated nickel atoms through itsnitrogendonors. The four remaining coordination sites are occupied bywater oxygen atoms. The binuclear[Ni2(bppz)(H2O)8]4+ cations are heldtogether by hydrogen bonds involving sulfate anions and watermolecules. Similarreactions with nickel(II) or copper(II) chloride in lesspolar solvents resulted in the formation of two newcoordination polymers,{[Ni2Cl2(bppz)(H2O)2(CH3OH)2]Cl2}n(2) and[Cu2Cl4(bppz)]n(3). These polymers couldbe obtained only in microcrystalline form. Their structures weredetermined ab initio from X-ray powderdiffractiondata. The complex{[Ni2Cl2(bppz)(H2O)2(CH3OH)2]Cl2}n(2) belongs to the triclinic space groupP with a =8.7014(4) Å, b = 10.1465(5) Å, c= 8.0303(3) Å, = 116.095(2), =112.713(3), = 64.056(3), and Z=1. The octahedral coordination of the nickel atom is achieved bytwo nitrogens of the ligand bppz, two chlorideions, and two oxygens from the solvent molecules. The bridgingnature of the chloride ions and the bis-bidentateligands (bppz) leads to a one-dimensional polymer. The compound[Cu2Cl4(bppz)]n(3) crystallizes in themonoclinic space group C2/m with a =13.9124(5) Å, b = 6.1844(2) Å, c= 10.1572(3) Å, = 112.952(3), andZ = 2. The copper atoms display a distortedoctahedral geometry where four of the coordination sites areoccupiedby chloride ions and the remaining two by nitrogen atoms of bppz.The metal atoms are bridged by two chlorineatoms and the bppz ligands, forming a two-dimensional coordinationpolymer.