title: Pyrazolate-bridging dinucleating ligands containing hydrogen-bond donors: synthesis and structure of their cobalt analogues.
abstract: Convergent preparative routes to new urea-pyrazolate dinucleating ligands are described. Metal complexes of these ligands have hydrogen bond donors that are proximal to the metal centers that interact with other coordinated species. This is exemplified by Co(II) dimers with Co(II)-mu-Cl-Co(II) motifs, in which the chloro ligand is involved in four intramolecular hydrogen bonds. These noncovalent interactions appear to influence the Co(II)-Cl bonds, which are unusually long, having lengths greater than 2.5 A.
authors.affiliation: Department of Chemistry, University of Kansas, 2010 Malott Hall, 1251 Wescoe Drive, Lawrence, Kansas 66045, USA.
authors.forename: Paul J
authors.initials: PJ
authors.lastname: Zinn
authors.forename: Douglas R
authors.initials: DR
authors.lastname: Powell
authors.forename: Victor W
authors.initials: VW
authors.lastname: Day
authors.forename: Michael P
authors.initials: MP
authors.lastname: Hendrich
authors.forename: Thomas N
authors.initials: TN
authors.lastname: Sorrell
authors.forename: A S
authors.initials: AS
authors.lastname: Borovik
mesh_terms: D001952:Bridged-Ring Compounds / Q000138:chemical synthesis / Q000737:chemistry; D003035:Cobalt / Q000737:chemistry*; D006860:Hydrogen Bonding; D008024:Ligands; D015394:Molecular Structure; D009942:Organometallic Compounds / Q000138:chemical synthesis* / Q000737:chemistry; D011720:Pyrazoles / Q000737:chemistry*; D014508:Urea / Q000031:analogs & derivatives / Q000138:chemical synthesis
chemical_list: D001952:Bridged-Ring Compounds; D008024:Ligands; D009942:Organometallic Compounds; D011720:Pyrazoles; D003035:Cobalt; D014508:Urea