title: Zn-OH2 and Zn-OH complexes with hydroborate-derived tripod ligands: a comprehensive study.
abstract: The complete array of those hydrotris(pyrazolyl/thioimidazolyl)borate ligands that were developed and used in the author's laboratories, with N3, N2S, NS2, and S3 donor sets, was scanned for their ability to form Zn-OH2 and Zn-OH complexes. The coordination motifs found were Zn-OH2, Zn-OH, Zn-OH-Zn, and Zn-O2H3-Zn. Of these, the well-established Zn-OH motif was complemented with novel species bearing N3, NS2, and S3 tripods. The Zn-OH2 motif was observed only with pyrazolylborate ligands and only in unusual situations with coordination numbers higher than 4 for zinc. The new Zn-OH-Zn motif was realized for three different pyrazolylborates, for one NS2 tripod, and for two S3 tripods. Finally, it was verified that the Zn-O2H3-Zn motif again occurs only with pyrazolylborate ligands. The new complexes were identified by a total of 11 structure determinations.
authors.affiliation: Institut für Anorganische und Analytische Chemie, Universität Freiburg, Albertstrasse 21, D-79104 Freiburg, Germany.
authors.forename: Mohamed M
authors.initials: MM
authors.lastname: Ibrahim
authors.forename: Cristina Pérez
authors.initials: CP
authors.lastname: Olmo
authors.forename: Teame
authors.initials: T
authors.lastname: Tekeste
authors.forename: Jan
authors.initials: J
authors.lastname: Seebacher
authors.forename: Guosen
authors.initials: G
authors.lastname: He
authors.forename: José A
authors.initials: JA
authors.lastname: Maldonado Calvo
authors.forename: Karin
authors.initials: K
authors.lastname: Böhmerle
authors.forename: Gunther
authors.initials: G
authors.lastname: Steinfeld
authors.forename: Horst
authors.initials: H
authors.lastname: Brombacher
authors.forename: Heinrich
authors.initials: H
authors.lastname: Vahrenkamp
mesh_terms: D001881:Borates / Q000737:chemistry*; D018360:Crystallography, X-Ray; D006860:Hydrogen Bonding; D006878:Hydroxides / Q000737:chemistry*; D007093:Imidazoles / Q000737:chemistry*; D008024:Ligands; D008958:Models, Molecular; D008968:Molecular Conformation; D009942:Organometallic Compounds / Q000737:chemistry*; D011720:Pyrazoles / Q000737:chemistry*; D013237:Stereoisomerism; D013438:Sulfhydryl Compounds / Q000737:chemistry*; D017967:Zinc Compounds / Q000737:chemistry*
chemical_list: D001881:Borates; D006878:Hydroxides; D007093:Imidazoles; D008024:Ligands; D009942:Organometallic Compounds; D011720:Pyrazoles; D013438:Sulfhydryl Compounds; D017967:Zinc Compounds; C052745:zinc hydroxide