Rosa Carballo
Universidade de Vigo, Química Inorgánica, Faculty Member
Materials based on the cationic copper(II) hexanuclear 18-membered metallacrown [18-MC${{_{{\rm Cu}{^{{\rm II}}}\hbox{-}{\rm N}({\rm 2ph})}}}$-6](6+) (2phH=2-piconyl hydrazide) and tetrafluoroborate, perchlorate, nitrate, sulfate, and... more
Materials based on the cationic copper(II) hexanuclear 18-membered metallacrown [18-MC${{_{{\rm Cu}{^{{\rm II}}}\hbox{-}{\rm N}({\rm 2ph})}}}$-6](6+) (2phH=2-piconyl hydrazide) and tetrafluoroborate, perchlorate, nitrate, sulfate, and perrhenate anions were prepared by an easy method in aqueous medium. Single-crystal X-ray characterization of six members of this new family of complexes showed that the anions are attached to the metallacrown by direct coordination to a copper cation or by hydrogen-bonding interaction with the center of the hexamer. The stable cationic nature of the complexes and their ability to bind different anions allows them to adsorb and immobilize environmentally relevant anions such as MO4 (-) (M=Tc, Re). The MO4 (-) trapping capacities suggest that these materials would be useful in the treatment of oxoanionic contaminants in water.
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ABSTRACT The title neutral complex, [Co(HG)2(H2O)2] or [Co(C2H3O3)2(H2O)2], contains monoanionic O,O′-bidentate glycolate ligands that chelate the cobalt(II) ion through the carboxylate and hydroxyl O atoms to form five-membered chelate... more
ABSTRACT The title neutral complex, [Co(HG)2(H2O)2] or [Co(C2H3O3)2(H2O)2], contains monoanionic O,O′-bidentate glycolate ligands that chelate the cobalt(II) ion through the carboxylate and hydroxyl O atoms to form five-membered chelate rings. The configuration around the cobalt ion can be described as all-cis. The nature of the ligands permits the formation of a supramolecular architecture based on hydrogen bonding.
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(4R)-3-[(2'R,3'R)-2'-Bromo-3'-(phenylbutanoyl)]-4-(phenylmethyl)-2 - oxazolidinone, C20H20Br-NO3, M(r) = 402.30, monoclinic, P2(1), a = 11.542 (2), b = 7.625 (1), c = 11.667 (1) A, beta = 113.97 (1)... more
(4R)-3-[(2'R,3'R)-2'-Bromo-3'-(phenylbutanoyl)]-4-(phenylmethyl)-2 - oxazolidinone, C20H20Br-NO3, M(r) = 402.30, monoclinic, P2(1), a = 11.542 (2), b = 7.625 (1), c = 11.667 (1) A, beta = 113.97 (1) degrees, V = 938.2 (2) A3, Z = 2, Dx = 1.42 g cm-3, lambda(Mo K alpha) = 0.71073 A, mu = 21.8 cm-1, F(000) = 412, T = 296 +/- 1 K, final R = 0.028 for 2369 observed reflections. Since a D-chiral auxiliary was used the configuration at the alpha-carbon was R as expected. The two carbonyls are aligned in opposite directions to each other to overcome van der Waals repulsions.
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Complexes [Re2(μ-X)2(CO)6(NCCH 3)2] (X = Cl, Br) have been easily prepared in high yield by refluxing of fac[ReX(CO)3(NCCH3)2] in toluene. The crystal and molecular structure of the bromine derivative have been determined by X-ray... more
Complexes [Re2(μ-X)2(CO)6(NCCH 3)2] (X = Cl, Br) have been easily prepared in high yield by refluxing of fac[ReX(CO)3(NCCH3)2] in toluene. The crystal and molecular structure of the bromine derivative have been determined by X-ray analysis. The molecule consists of two fac-Re(CO) 3 fragments bridged by two bromine atoms. The acetonitrile molecules reside above and below the Re2Br2 plane.
A new mixed-ligand complex of copper(II) with 1, 10-phenanthroline and 2-methyllactate was prepared. [Cu(HmL)2(phen)·2H2O (where HmL = monodeprotonated 2-methyllactic acid) was characterized by elemental analysis, IR, electronic and EPR... more
A new mixed-ligand complex of copper(II) with 1, 10-phenanthroline and 2-methyllactate was prepared. [Cu(HmL)2(phen)·2H2O (where HmL = monodeprotonated 2-methyllactic acid) was characterized by elemental analysis, IR, electronic and EPR spectroscopy, magnetic measurements at room temperature, thermogravimetric analysis and X-ray diffractometry. The copper atom is in a tetragonally distorted octahedral environment and the 2-methyllactato ligand is bidentately chelating. The presence of lattice water molecules mediates the formation of a three-dimensional network.
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Two new mixed-ligand complexes (Fe(HG)2(dipyam)) (1) (HG glycolato and dipyam 2,2-dipyridylamine) and (Cu(HB)2(im)2)·2H2 O( 2 )( HB benzilato and im imidazole) have been hydrothermally synthesized and structurally characteri- sed by X-ray... more
Two new mixed-ligand complexes (Fe(HG)2(dipyam)) (1) (HG glycolato and dipyam 2,2-dipyridylamine) and (Cu(HB)2(im)2)·2H2 O( 2 )( HB benzilato and im imidazole) have been hydrothermally synthesized and structurally characteri- sed by X-ray diffraction. In both cases the metallic centre is in an octahedral environment, strongly distorted in 2 (42 coordina- tion). The α-hydroxycarboxylato ligands (glycolato or benzilato) present different coordinative behaviour,
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ABSTRACT The mononuclear compounds [Cu(OAc)(bipy)2]Cl·4H2O·1/2MeOH(1) and [Co(OH2)2(phen)2](OAc)2·6H2O(2) were unexpectedly obtained as single crystals from mother liquors left following isolation of the expected products of the... more
ABSTRACT The mononuclear compounds [Cu(OAc)(bipy)2]Cl·4H2O·1/2MeOH(1) and [Co(OH2)2(phen)2](OAc)2·6H2O(2) were unexpectedly obtained as single crystals from mother liquors left following isolation of the expected products of the reactions, in ethanol of Cu(OAc)2, benzylic acid and 2, 2'-bipyridine (for 1) and Co(OAc)2, D, L-mandelic acid and 1, 10-phenanthroline (for 2). The complexes were characterized by elemental analysis, IR and electronic spectroscopy and magnetic measurements at room temperature and their structures were determined by single-crystal X-ray analysis. In 1, the pentacoordinated copper atom has a basically square pyramidal coordination polyhedron, while in 2 the cobalt atom has a distorted octahedral environment. In both cases, the complexes are linked by hydrogen bonds and aromatic-aromatic interactions.Unerwartete Bildung der Gemischtligand-Komplexe [Cu(OAc)(bipy)2]Cl·4H2O-·1/2MeOH und [Co(OH2)2(phen)2](OAc)2·6H2O und ihre KristallstrukturenDie einkernigen Verbindungen [Cu(OAc)(bipy)2]Cl·4H2O·1/2MeOH (1) und [Co(OH2)2(phen)2](OAc)2·6H2O (2) wurden unerwartert als Einkristalle aus Mutterlaugen der erwarteten Produkte der Reaktion von Cu(OAc)2, Benzylsäure und 2, 2′-Bipyridin (für 1) und Co(OAc)2, D, L-Mandelsäure und 1, 10-Phenanthrolin (für 2) in Ethanol erhalten. Die Komplexe werden durch Elementaranalysen, IR- und Elektronenspektren und durch magnetische Messungen bei Raumtemperatur sowie durch Einkristallstrukturanalysen charakterisiert. In 1 bildet das fünffach koordinierte Kupferatom ein tetragonal-pyramidales Koordinationspolyeder, während in 2 das Cobaltatom verzerrt oktaedrische Umgebung hat. In beiden Fällen sind die Komplexe über Wasserstoffbrückenbindungen und Aromaten-Aromaten-Wechselwirkungen verknüpft.
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Abstract The compound [Cu 4 (μ 2-OH) 2 (μ 3-OH) 2 Cl 2 (bipy) 4] Cl 2· 6H 2 O (1) was obtained by recrystallization of [Cu (HB) 2 (2, 2′-bipy)]· H 2 O (H 2 B= diphenylglycolic acid) from EtOH/CH 2 Cl 2 and their structure has been... more
Abstract The compound [Cu 4 (μ 2-OH) 2 (μ 3-OH) 2 Cl 2 (bipy) 4] Cl 2· 6H 2 O (1) was obtained by recrystallization of [Cu (HB) 2 (2, 2′-bipy)]· H 2 O (H 2 B= diphenylglycolic acid) from EtOH/CH 2 Cl 2 and their structure has been determined by single-crystal X-ray ...
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ABSTRACT The cobalt(II) complexes [Co(HL1)2(H2O)2]·H2O) (1) and [Co(HL2)2(H2O)2](2) [(HL1)- = (/plusmn;)-lactate, (HL2)- = 2-Methyl-lactate] were prepared and characterized structurally. The cobalt atom is in a distorted octahedral... more
ABSTRACT The cobalt(II) complexes [Co(HL1)2(H2O)2]·H2O) (1) and [Co(HL2)2(H2O)2](2) [(HL1)- = (/plusmn;)-lactate, (HL2)- = 2-Methyl-lactate] were prepared and characterized structurally. The cobalt atom is in a distorted octahedral environment in both compounds. Both α-hydroxycarboxylato ligands are O, O'-bidentate chelating monoanions. The presence of a lattice water molecule in 1 makes its supramolecular organization different from that of 2. The thermal behaviour of both compounds was also investigated.
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Abstract Compounds [Cu (en) 2 (OH 2) 2](HB) 2· 2H 2 O (1) and [Cu (HB)(en) 2 (OH 2)](HB)(2)(HB= benzilate; en= ethylenediamine) present the Cu (II) atom coordinated by different N 4 O 2 donor sets, with 4+ 2 and 4+ 1+ 1 coordination... more
Abstract Compounds [Cu (en) 2 (OH 2) 2](HB) 2· 2H 2 O (1) and [Cu (HB)(en) 2 (OH 2)](HB)(2)(HB= benzilate; en= ethylenediamine) present the Cu (II) atom coordinated by different N 4 O 2 donor sets, with 4+ 2 and 4+ 1+ 1 coordination geometries, respectively. ...
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... Data-to-parameter ratio = 13.8. Details. (OC-6-32)-Diaquabis(glycolato)cobalt(II). Rosa Carballo, a * Alfonso Castiñeiras, b Berta Covelo, a Emilia García-Martínez a and Ezequiel M. Vázquez-López a. ... Data collection. Bruker SMART... more
... Data-to-parameter ratio = 13.8. Details. (OC-6-32)-Diaquabis(glycolato)cobalt(II). Rosa Carballo, a * Alfonso Castiñeiras, b Berta Covelo, a Emilia García-Martínez a and Ezequiel M. Vázquez-López a. ... Data collection. Bruker SMART CCD area-detector diffractometer. and scans. ...
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ABSTRACT The structure of the title compound, [Co(AcO)2(2,2′-bipy)(H2O)2] or [Co(C2H3O2)2(C10H8N2)(H2O)2], consists of mononuclear molecules with crystallographic twofold rotation symmetry. The Co atom displays a distorted tetragonally... more
ABSTRACT The structure of the title compound, [Co(AcO)2(2,2′-bipy)(H2O)2] or [Co(C2H3O2)2(C10H8N2)(H2O)2], consists of mononuclear molecules with crystallographic twofold rotation symmetry. The Co atom displays a distorted tetragonally compressed octahedral environment, with a unique Co—N distance of 2.1227 (14) Å and Co—O distances in the range 2.0976 (13)–2.1256 (14) Å. The molecules are self-assembled via hydrogen bonds to form an one-dimensional chain and via aromatic–aromatic interactions giving a two-dimensional structure.
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... Rosa Carballo, a J. Sergio Casas, b Emilia García-Martínez, a Gumersindo Pereiras-Gabián, a Agustín Sánchez, b José Sordo b and ... of this family to extract copper from ore has also recently been reported (Emeleus et al., 2001... more
... Rosa Carballo, a J. Sergio Casas, b Emilia García-Martínez, a Gumersindo Pereiras-Gabián, a Agustín Sánchez, b José Sordo b and ... of this family to extract copper from ore has also recently been reported (Emeleus et al., 2001 [Emeleus, LC, Cupertino, DC, Harris, SG, Owens ...
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