Compartmental pyrazolate ligands providing two adjacent tris(pyridylalkyl)amine-type binding pockets and their dicopper(II) fluoride complexes featuring extremely short intramolecular O–H
- 作者：Ackermann ; Jens ; Meyer ; Franc ; Pritzkow ; Hans
- 关键词：Copper ; Dinuclear complexes ; Pyrazolate complexes ; N-ligands ; Hydrogen bond
- 刊名：Inorganica Chimica Acta
- 出版年：2004
- 期刊代码：40_00201693
- 类别：ch
- 出版时间：September 10, 2004
- 卷：357
- 期：12
- 页码：3703-3711
- 文件大小：353 K
摘要
A set of pyrazolate-based compartmental ligands HL2–HL5 with pendent (pyridylalkyl)amine side arms in the 3- and 5-positions of the pyrazole has been prepared. The ligands differ by the number and lengths of the pyridylalkyl arms, and they can be described as dinucleating versions of well-known ligands such as tris(pyridylmethyl)amine (tpma) or tris(pyridylethyl)amine (tpea). Reaction of HL2, HL3 or HL5 with Cu(BF4)2·6H2O in the presence of base causes fluoride abstraction from the tetrafluoroborate and gives dicopper(II) complexes 1, 2, and 3a and b, respectively, which feature extremely short intramolecular F
HOMe or FHOH bridges (d(FO)=2.384(6)–2.507(3)). Molecular structures of all four complexes have been elucidated by X-ray crystallography and are compared to their mononuclear analogues. The influence of the intramolecular FHO bridge on Cu–F and Cu–O bond lengths as well as on other structural characteristics is discussed.
HOMe or FHOH bridges (d(FO)=2.384(6)–2.507(3)). Molecular structures of all four complexes have been elucidated by X-ray crystallography and are compared to their mononuclear analogues. The influence of the intramolecular FHO bridge on Cu–F and Cu–O bond lengths as well as on other structural characteristics is discussed.