.beta.-Lactam antibiotics derived from nitrogen hetrocyclic acetic acids. 1. Penicillin derivatives

Single molecule magnet features in luminescent lanthanide coordination polymers with heptacoordinate Dy/Yb(iii) ions as nodes

“…The Hoqa ligand was synthesized via a modified method described in the literature. 67 The C, H, and N contents of the products were measured using a Vario MICRO cube elemental analyzer. Infrared spectra (IR) were recorded in the range of 400–4000 cm −1 on a Nicolet iS5 infrared spectrometer with samples prepared as KBr discs.…”

Tetraaquabis[(4-oxo-4H-pyridin-1-yl)acetato]manganese(II)

“…For general background, see: Edwards et al (1977). Complexes with 4-OPA À exist as either mononuclear with the ligands as counter-anions (Gao et al, 2004;Zhang et al, 2004a,b;Zhao et al, 2004;Zhang et al, 2005) or as polymers with the metal ions bridged by the 4-OPA À ligands (Zhang et al, 2006).…”

“…(2007). E63, m1514 (4-Oxo-4H-pyrindin-1-yl)acetic acid (4-OPA -), an important medical intermediate (Edwards et al, 1977), is a potential multidentate ligand with versatile binding ability. Recent studies in our laboratory have demontrated that the complexes containing 4-OPAligands exhibit two type structures: mononuclear in which the 4-OPAligands exist as counter anions (Gao et al, 2004;Zhang et al, 2004a,b;Zhao et al, 2004;Zhang et al, 2005) and polymer with the adjacent metal ions bridged by carbonyl and carboxylate groups of 4-OPAligand (Zhang et al, 2006).…”

Hexaaquacobalt(II) bis[(4-oxo-4H-pyridin-1-yl)acetate] dihydrate

“…(4-Oxo-4H-pyridin-1-yl)acetic acid is known as an important medical intermediate (Edwards et al, 1977), but there is little information on the structure of its metal complexes. We have recently reported the structure of hexaaquazinc(II) bis[(4oxo-4H-pyridin-1-yl)acetate] dihydrate (Gao et al, 2004) and hexaaquanickel(II) bis[(4-oxo-4H-pyridin-1-yl)acetate] dihydrate (Zhang et al, 2004).…”