[1,1′-Diphenyl-3,3′-(propane-1,3-diyldinitrilo)dibut-1-enolato]copper(II)

The title compound, [Cu(C23H24N2O2)] or [Cu{(BA)2pn}], where (BA)2pn is 1,1′-diphenyl-3,3′-(propane-1,3-diyldinitrilo)dibut-1-enolate, is a mononuclear copper(II) complex, located on a twofold axis. The four-coordinate CuII atom is in a tetra­hedrally distorted square plane defined by the N and O atoms of the Schiff base ligand. In the tetra­dentate ligand, the two chelate rings are twisted relative to each other, making a dihedral angle of 36.57 (3)°

{2,2′-[o-Phenyl­enebis(nitrilo­methyl­idyne)]diphenolato}dipyridinecobalt(III) perchlorate

The title compound, [Co(C20H14N2O2)(C5H5N)2]ClO4 or [Co(salophen)(py)2]ClO4, where salophen is o-phenyl­enebis(nitrilo­methyl­idyne)]diphenolate and py is pyridine, contains a six-coordinate mononuclear cobalt(III) atom. The two phenolic O atoms and the two imine N atoms are located in cis positions. There are two pyridine mol­ecules attached to the metal atom, filling the axial sites with a mutually perpendicular disposition of the pyridine planes [86.11 (5)°]. The Co complexes are stacked in layers parallel to (100). Coherence of the structure is provided by a variety of C—H⋯O interactions between the complexes and the perchlor­ate counter anion

{2,2′-[1,1′-(3-Aza­pentane-1,5-diyl­dinitrilo)diethyl­idyne]diphenolato}(piperidine)cobalt(III) tetra­phenyl­borate

The title compound, [Co(C20H23N3O2)(C5H11N)](C24H20B) or [Co{(Me-sal)2dien}(pprdn)]BPh4, where (Me-sal)2dien is 2,2′-[1,1′-(3-aza­pentane-1,5-diyldinitrilo)diethyl­idyne]diphenolate and pprdn is piperidine, contains a penta­dentate (Me-sal)2dien ligand furnishing an N3O2 set, such that two of the N and one of the O atoms of the salicyl­idene rings define three positions of an equatorial plane, whereas the secondary amine N atom and the other O atom of the salicyl­idene lie in axial positions. The piperidine ligand occupies an equatorial position trans to one of the imine N atoms of the salicyl­idene. In the observed conformation of the penta­dentate ligand, the salicyl­idene rings attain asymmetrical positions owing to the structural demands. The geometry of the resulting CoN4O2 coordination can be described as distorted octa­hedral. The asymetric unit contains two formula units

{2,2′-[3-Aza­pentane-1,5-diylbis(nitrilo­methyl­idyne)]dipyrrol-1-yl}(4-methyl­pyridine)cobalt(III) tetra­phenyl­borate

The title compound, [Co(C14H17N5)(C6H7N)](C24H20B) or [Co{(pyrrole)2dien}(4-Mepy)]BPh4 where (pyrrole)2dien is 2,2′-[(3-aza­pentane-1,5-diylbis(nitrilo­methyl­idyne)]dipyrrole and 4-Mepy is 4-methyl­pyridine, contains a penta­dentate (pyrrole)2dien ligand furnishing an N5 set, such that two of the pyrrole N atoms and two of the dien N atoms occupy the equatorial positions while one of the imine N atoms of the (pyrrole)2dien ligand occupies the axial position. The 4-methyl­pyridine ligand occupies an axial position trans to one of the imine N atoms of the penta­dentate ligand. In the observed conformation of the penta­dentate ligand, the pyrrole rings attain asymmetrical positions owing to the structural demands. The geometry of the resulting CoN6 coordination can be described as distorted octa­hedral

{N,N′-Bis[(E)-3-phenyl­prop-2-en-1-yl­idene]propane-1,3-diamine-κ2 N,N′]dichloridocobalt(II)

The CoII atom in the title monomeric Schiff base complex, [CoCl2(C21H22N2)], is bonded to two Cl atoms and to two N atoms of the Schiff base ligand N,N′-bis­[(E)-3-phenyl­prop-2-en-1-yl­idene]propane-1,3-diamine in a distorted tetra­hedral geometry. The mol­ecule has an idealised mirror symmetry, but is not located on a crystallographic mirror plane

Suzuki-Miyaura C-C Coupling Reactions Catalyzed by Supported Pd Nanoparticles for the Preparation of Fluorinated Biphenyl Derivatives

Heterogeneous recyclable catalysts in Suzuki-Miyaura C-C coupling reactions are of great interest in green chemistry as reusable alternatives to homogeneous Pd complexes. Considering the interesting properties of fluorinated compounds for the pharmaceutical industry, as precursors of novel materials, and also as components of liquid crystalline media, this present study describes the preparation of different fluorinated biphenyl derivatives by Suzuki-Miyaura coupling reactions catalyzed by a heterogeneous system (G-COOH-Pd-10) based on Pd nanoparticles supported onto COOH-modified graphene. The catalytic activity of the hybrid material G-COOH-Pd-10 has been tested in Suzuki-Miyaura C–C coupling reactions observing excellent versatility and good conversion rates in the reactions of phenylboronic acid, 4-vinylphenylboronic acid, 4-carboxyphenylboronic acid, and 4-fluorophenylboronic acid with 1-bromo-4-fluorobenzene. In addition, the influence of the arylbromide has been studied by carrying out reactions of 4-fluorophenylboronic acid with 1-bromo-2-fluorobenzene, 1-bromo-3-fluorobenzene, 1-bromo-4-fluorobenzene, 2-bromo-5-fluorotoluene, and 2-bromo-4-fluorotoluene. Finally, catalyst recyclability tests show a good degree of reusability of the system based on G-COOH-Pd-10 as the decrease in catalytic activity after five consecutive catalytic cycles in the reaction of 1-bromo-4-fluorobenzene with 4-florophenylboronic acid at 48 hours of reaction is lower than 8% while in the case of reactions at three hours the recyclability of the systems is much lower.We gratefully acknowledge financial support from the Ministerio de Economía y Competitividad, Spain (Grant no. CTQ2015-66164-R). We would also like to thank Universidad Rey Juan Carlos and Banco de Santander for supporting our Research Group of Excellence QUINANOAP. We would also like to thank Isfahan University of Technology for the partial financial support of the research stay of R.S.E

Applications of Nanomaterials Based on Magnetite and Mesoporous Silica on the Selective Detection of Zinc Ion in Live Cell Imaging

Functionalized magnetite nanoparticles (FMNPs) and functionalized mesoporous silica nanoparticles (FMSNs) were synthesized by the conjugation of magnetite and mesoporous silica with the small and fluorogenic benzothiazole ligand, that is, 2(2-hydroxyphenyl)benzothiazole (hpbtz). The synthesized fluorescent nanoparticles were characterized by FTIR, XRD, XRF, 13C CP MAS NMR, BET, and TEM. The photophysical behavior of FMNPs and FMSNs in ethanol was studied using fluorescence spectroscopy. The modification of magnetite and silica scaffolds with the highly fluorescent benzothiazole ligand enabled the nanoparticles to be used as selective and sensitive optical probes for zinc ion detection. Moreover, the presence of hpbtz in FMNPs and FMSNs induced efficient cell viability and zinc ion uptake, with desirable signaling in the normal human kidney epithelial (Hek293) cell line. The significant viability of FMNPs and FMSNs (80% and 92%, respectively) indicates a potential applicability of these nanoparticles as in vitro imaging agents. The calculated limit of detections (LODs) were found to be 2.53 X 10-6 and 2.55 X 10-6 M for Fe3O4-H@hpbtz and MSN-Et3N-IPTMS-hpbtz-f1, respectively. FMSNs showed more pronounced zinc signaling relative to FMNPs, as a result of the more efficient penetration into the cells.This research was funded by several sources. The URJC authors thank the financial support of theMinisterio de Economía y Competitividad and FEDER (Grants nos. CTQ2015-66164-R and CTQ2017-90802-REDT) and Universidad Rey Juan Carlos-Banco de Santander for supporting our excellence group QUINANOAP. The partial support of this work by the Isfahan University of Technology Research Council (grant number 500/95/24305 and the Iran National Science Foundation through INSF grant number 95828071 is also acknowledged. The CNIC is supported by the Spanish Ministerio de Ciencia, Innovación y Universidades and the Pro-CNIC Foundation and is a Severo Ochoa Center of Excellence (SEV-2015-0505). M.F. would like to thank MEyC for the research grant no. SAF2014-59118-JIN, co-funded by Fondo Europeo de Desarrollo Regional (FEDER) and COST Action CA1520: ‘European Network on NMR Relaxometry-EURELAX’. M.F. would also like to thank the Community of Madrid for research contract num. 2017-T1/BIO-4992 (‘Atraccion de Talento’ Action) cofunded by Universidad Complutense de Madrid

Intrachain antiferromagnetic exchange in a 1D branched-chain built of two different copper(II) centres interlinked by end-on azido and phenoxo bridges: electron density map, electrochemical and magnetic properties

A 1D, end-on azido- and phenoxo-bridged, coordination polymer, [Cu-2(mu-NAPPR)(mu(1,1)-N-3)(2)](n) (1), (NAPPR(2-) = 1,3-bis(naphthylideneimino) propane dianion), was synthesized and characterized. The 1D branched-chain is built of two types of slightly different, square-pyramidal, Cu(II) ions with different sets of donor atoms. Temperature-and field-dependent magnetic analyses reveal an antiferromagnetic interaction between copper centres in the main chain (Cu-2) mediated by EO-azide bridges along the chain. The interaction between the copper centres Cu1 (in the branches of the main chain) and Cu-2 is very weak and is included by means of an own Weiss constant theta'. The electron density map of 1 from synchrotron data shows that the d(x2-y2) orbitals of Cu-2 are not well described by the procrystal model, a difference which might be meaningful for the magnetic properties. Cyclic voltammetry studies show two different redox waves with a large difference between the redox potentials of the two types of copper centres (1.21 V). The resulting data are consistent with the crystal structure of this complex determined by single crystal X-ray diffraction