Contrasting Structures of Two Adducts of Zinc Crotonate with Substituted Pyridines

X-ray and vibrational spectra on metal complexes with indolecarboxylic acids

“…Compound of zinc(II) with crotonate and pyridine forms a polymeric chain with a single crotonate bridge linking each Zn atom to the next one. Each Zn atom also carries a chelating crotonate and a 4-vinylpyridine ligand to give a highly distored five-coordinate geometry [5]. In the complex of zinc(II) with 4-imidazoleacetic acid, the ligand appears in two forms: anionic, linking two metal centres and neutral, acting as side ligand with respect to polymeric chain [10].…”

“…Carboxylate groups are capable of binding the zinc in either a monodentate, bidentate or bridging mode leading to both mono-and polynuclear molecular and polymeric structures [1][2][3][4][5][6][7][8][9][10][11][12][13]. Various zinc carboxylates are known to possess mild antiseptic and fungistatic properties and have also been used, for example, as catalysts, wood preservatives, waterproofing agents, auxiliary drying agents in paints, hardeners in varnishes and as processing lubricants and anti-stick agents in the rubber and plastics industries [1].…”

Crystal structure of (4-cyanopyridine-κN){5,10,15,20-tetrakis[4-(benzoyloxy)phenyl]porphyrinato-κ4N}zinc–4-cyanopyridine (1/1)

“…Many structures of five-coordinate zinc porphyrins of the type [Zn(Porph)(L)] (Porph = is a porphyrinato ligand and L is a neutral unidentate ligand N-bonded to the zinc cation) are known in the literature. However, only three structures of zinc-4-NCpy non-porphyrinic species [CSD refcodes CYPYZN (Steffen & Palenik, 1977); LIMWUZ (Clegg et al, 1995) and QIDXAD (Huang et al, 2007;CCD Version 5.35 (Groom & Allen, 2014)] and one structure of a zinc-4-NCpyporphyrin derivative are reported in the literature (CSD refcode IRAFIR; Brahma et al, 2011). To gain more insight into the structural and spectroscopic properties of Zn II -Ndonor monodentate neutral ligand metalloporphyrins in general and Zn II -cyanopyridine porphyrin derivatives in particular, we report herein the synthesis, the molecular structure and the spectroscopic data of the title compound with the formula [Zn(TPBP)(4-CNpy)]Á(4-CNpy) (I).…”

“…The asymmetric unit of (I) consists of the [Zn(TPBP)(4-CNpy)] complex and one 4-cyanopyridine molecule. The Zn __ N(4-CNpy) bond length [2.159 (2) Å ] is in the range (2.055-2.248 Å ) of those of the zinc-4-CNpy complexes reported in the literature [CSD refcodes LIMWUZ (Clegg et al 1995) and QIDXAD (Huang et al, 2007)]. The average equatorial zinc-N(pyrrole) distance (Zn-Np) is 2.060 (6) Å which is close to those in related zinc metalloporphyrins of type [Zn(Porph)(L)] (Porph and L are a porphyrinato and a monodentate neutral ligand, respectively) [CSD refcodes ATUSOX (Vinodu & Goldberg, 2004) and GEPBAF (Lipstman et al, 2006)].…”

High oxidation state aqueous organometallics. Formation and structure of an oxo-centred Cp*MoV trinuclear cation by chemical reduction of Cp*2Mo2O5

“…The absence of a strong interaction may be easily understood on a qualitative basis, imagining the formal assembly of the [(CpMo The [Zn2(O2CCF3)6] 2structure is also worthy of brief comment. Structurally characterised lantern-type Zn2(-O2CR)4L2 precedents (R = CH3, CH=CHCH3; L = py, py-4-CN, quin) show slightly shorter Zn-Zn distances (2.89-2.98 Å), [21][22][23] though a direct bonding interaction is precluded by the closedshell configuration of Zn 2+ . An incipient interaction between the Zn 2+ centres and the "free" C=O groups may be responsible for a slight misalignment between the Zn-O(term.)…”