ORCID Profile
0000-0002-0417-9402
Current Organisation
University of Aveiro
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Publisher: Elsevier BV
Date: 08-2007
Publisher: Elsevier BV
Date: 2009
Publisher: Elsevier
Date: 1995
Publisher: Springer Science and Business Media LLC
Date: 1994
DOI: 10.1038/367347A0
Publisher: Royal Society of Chemistry (RSC)
Date: 2008
DOI: 10.1039/B802927J
Abstract: The use of pyridine-2-amidoxime in reaction with NiCl2.6H2O in the presence of NaOMe has led to a cationic NiII 12 cluster with novel structural features each cluster molecule is a ferromagnet with a spin ground state of S = 6 arising from ferromagnetic exchange between the six octahedral NiII ions, but with intercationic interactions also affecting the magnetic properties.
Publisher: American Chemical Society (ACS)
Date: 10-07-2007
DOI: 10.1021/IC700507J
Abstract: The hydrothermal synthesis and structural characterization of a number of complex compounds containing the alent tris(oxalato-O,O')germanate anion, [Ge(C2O4)3]2-, or the neutral bis(oxalate-O,O')germanium fragment, [Ge(C2O4)2], with transition-metal (M) cationic complexes of 1,10'-phenanthroline (phen) is reported: [M(phen)3][Ge(C2O4)3].xH2O [where M2+ = Cu2+ (1a and 1b), Fe2+ (2a and 2b), Ni2+ (3), Co2+ (4) x = 0.2 for 2b], [MGe(phen)2(mu2-OH)2(C2O4)2] [where M2+ = Cd2+ (5) and Cu2+ (6)]. The isolation of two polymorphs with Cu2+ (1a and 1b) and other pseudo-polymorphs for Fe2+ (2a and 2b) was rationalized based on slightly different molar ratios for the starting materials. All compounds have been characterized using EDS, SEM, vibrational spectroscopy (FT-IR and FT-Raman), thermogravimetry, and CHN elemental composition and their structure determined on the basis of single-crystal X-ray diffraction studies. The crystal packing of the different chemical moieties for each series of compounds was discussed on the basis of the various intermolecular interactions present (strong C-H...pi and weak C-H...O hydrogen-bonding interactions, C-H...pi and pi-pi contacts).
Publisher: Elsevier BV
Date: 03-2008
Location: United Kingdom of Great Britain and Northern Ireland
No related grants have been discovered for Joao Rocha.