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Showing 1 to 12 of 86 entries
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Dichlorodioxomolybdenum(VI) complexes bearing oxygen-donor ligands as olefin epoxidation catalysts.

Dalton transactions (Cambridge, England : 2003)

Oliveira TS, Gomes AC, Lopes AD, Lourenço JP, Almeida Paz FA, Pillinger M, Gonçalves IS.
PMID: 26174418
Dalton Trans. 2015 Aug 21;44(31):14139-48. doi: 10.1039/c5dt02165k.

Treatment of the solvent adduct [MoO2Cl2(THF)2] with either 2 equivalents of N,N-dimethylbenzamide (DMB) or 1 equivalent of N,N'-diethyloxamide (DEO) gave the dioxomolybdenum(vi) complexes [MoO2Cl2(DMB)2] () and [MoO2Cl2(DEO)] (). The molecular structures of and were determined by single-crystal X-ray diffraction....

Solid-state studies and antioxidant properties of the γ-cyclodextrin·fisetin inclusion compound.

Beilstein journal of organic chemistry

Pais JM, Barroca MJ, Marques MPM, Almeida Paz FA, Braga SS.
PMID: 29062435
Beilstein J Org Chem. 2017 Oct 13;13:2138-2145. doi: 10.3762/bjoc.13.212. eCollection 2017.

Fisetin is a natural antioxidant with a wide range of nutraceutical properties, including antidiabetic, neuroprotecting, and suppression or prevention of tumors. The present work describes the preparation of a water-soluble, solid inclusion compound of fisetin with gamma-cyclodextrin (γ-CD), a...

Multifunctional metal-organic frameworks: from academia to industrial applications.

Chemical Society reviews

Silva P, Vilela SM, Tomé JP, Almeida Paz FA.
PMID: 26161830
Chem Soc Rev. 2015 Oct 07;44(19):6774-803. doi: 10.1039/c5cs00307e.

After three decades of intense and fundamental research on metal-organic frameworks (MOFs), is there anything left to say or to explain? The synthesis and properties of MOFs have already been comprehensively described elsewhere. It is time, however, to prove...

Spectroscopic study of a UV-photostable organic-inorganic hybrids incorporating an Eu3+ beta-diketonate complex.

Chemphyschem : a European journal of chemical physics and physical chemistry

Lima PP, Sá Ferreira RA, Freire RO, Almeida Paz FA, Fu L, Alves S, Carlos LD, Malta OL.
PMID: 16514701
Chemphyschem. 2006 Mar 13;7(3):735-46. doi: 10.1002/cphc.200500588.

New europium and gadolinium tris-beta-diketonate complexes have been prepared and incorporated in sol-gel-derived organic-inorganic hybrids, named di-ureasils. The general formula [Ln(btfa)3(4,4'-bpy)(EtOH)] (Ln=Eu, Gd; 4,4'-bpy=4,4'-bipyridine; btfa=4,4,4-trifluoro-1-phenyl-1,3-butanedione) for the complexes was confirmed by X-ray crystallography and elemental analysis. The ground-state geometry...

Chemical evaluation of hypothetical uninodal zeolites.

Journal of the American Chemical Society

Foster MD, Delgado Friedrichs O, Bell RG, Almeida Paz FA, Klinowski J.
PMID: 15291580
J Am Chem Soc. 2004 Aug 11;126(31):9769-75. doi: 10.1021/ja037334j.

Optimized structural parameters, framework energies relative to alpha-quartz, and volumes accessible to sorption have been calculated for the systematically enumerated hypothetical uninodal zeolitic structures (structures in which all tetrahedral sites are equivalent). The structures were treated as silica polymorphs,...

Two- and three-dimensional cadmium-organic frameworks with trimesic acid and 4,4'-trimethylenedipyridine.

Inorganic chemistry

Almeida Paz FA, Klinowski J.
PMID: 15206869
Inorg Chem. 2004 Jun 28;43(13):3882-93. doi: 10.1021/ic049523o.

Three novel cadmium-organic frameworks built-up from 1,3,5-benzenetricarboxylate anions (HXBTC(x-3)) and 4,4'-trimethylenedipyridine (TMD) have been hydrothermally synthesized, and characterized using single-crystal X-ray diffraction, thermoanalytical measurements, elemental analysis, and IR and Raman spectroscopies: [Cd(HBTC)(TMD)(2)].8.5H(2)O (I), [Cd(HBTC)(TMD)(H(2)O)].4.5H(2)O (II), and [Cd(2)(BTC)(TMD)(2)(NO(3))].3H(2)O (III), with...

Mo(4)(eta(3)-allyl)(4)Cl(2)(OH)(2)(CO)(8): the first cubane-type Mo(2+) organometallic complex with mu(3)-OH and mu(3)-Cl bridges.

Acta crystallographica. Section C, Crystal structure communications

Amarante TR, Gonçalves IS, Almeida Paz FA.
PMID: 19346604
Acta Crystallogr C. 2009 Apr;65:m168-70. doi: 10.1107/S0108270109009512. Epub 2009 Mar 28.

The reaction between fluorenyllithium and Mo(eta(3)-C(3)H(5))Cl(NCMe)(2)(CO)(2) led to the isolation of di-mu(3)-chlorido-di-mu(3)-hydroxido-tetrakis[(eta(3)-allyl)dicarbonylmolybdenum(II)]-9-fluorenone-tetrahydrofuran (1/1/1), [Mo(4)(C(3)H(5))(4)Cl(2)(OH)(2)(CO)(8)].C(4)H(8)O.C(13)H(8)O. The tetrametallic Mo(4) unit constitutes the first example of a complex containing simultaneously two mu(3)-OH groups and two mu(3)-Cl anions capping the metallic trigonal prism....

Poly[[aqua-μ(3)-picolinato-μ(2)-picolinato-dipicolinatopotassium(I)terbium(III)] 2.5-hydrate].

Acta crystallographica. Section E, Structure reports online

Cunha-Silva L, Soares-Santos PC, Nogueira HI, Trindade T, Klinowski J, Rocha J, Almeida Paz FA.
PMID: 21201993
Acta Crystallogr Sect E Struct Rep Online. 2008 Mar 07;64:m529-30. doi: 10.1107/S1600536808005758.

In the title compound, [KTb(C(6)H(4)NO(2))(4)(H(2)O)]·2.5H(2)O, each Tb(3+) centre is coordinated by four N and five O atoms from five distinct picolinate ligands in a geometry resembling a highly distorted tricapped trigonal prism. One of the ligands establishes a skew...

Poly[hexa-aqua-bis(μ(3)-naphthalene-2,6-dicarboxyl-ato)(μ(2)-naphthalene-2,6-dicarboxyl-ato)diholmium(III)].

Acta crystallographica. Section E, Structure reports online

Almeida Paz FA, Klinowski J.
PMID: 21200496
Acta Crystallogr Sect E Struct Rep Online. 2007 Dec 12;64:m140-1. doi: 10.1107/S1600536807064483.

The crystal structure of the title compound, [Ho(2)(C(12)H(6)O(4))(3)(H(2)O)(6)](n), contains binuclear centrosymmetric {Ho(2)O(2)(CO(2))(4)(H(2)O)(6)} cores inter-connected via the naphthalene-2,6-dicarboxyl-ate (NDC(2-)) bridging ligands into a two-dimensional neutral plane net, ∞(2)[Ho(2)(NDC)(3)(H(2)O)(6)], exhibiting a typical (4,4)-topology. Inter-actions between adjacent layers are assured by a...

1,3-Dicyclo-hexyl-imidazolidine-2,4,5-trione: a second polymorph.

Acta crystallographica. Section E, Structure reports online

Talhi O, Fernandes JA, Pinto DC, Silva AM, Almeida Paz FA.
PMID: 23284534
Acta Crystallogr Sect E Struct Rep Online. 2012 Nov 01;68:o3233-4. doi: 10.1107/S1600536812043619. Epub 2012 Oct 27.

The title compound, C(15)H(22)N(2)O(3), was obtained as a by-product of oxidative cleavage of 1,3-dicyclo-hexyl-(3-oxo-2,3-dihydro-benzofuran-2-yl)imidazolidine-2,4-dione. Herein, we report the crystal structure of a second polymorph, which was obtained by crystallization from an ethanol solution at 253 K, instead of slow...

A 2:1 cocrystal of the cis and trans isomers of bis-[1,1,1,5,5,5-hexa-fluoro-pentane-2,4-dionato(1-)-κO,O']bis-(4-phenyl-pyridine N-oxide-κO)copper(II).

Acta crystallographica. Section E, Structure reports online

Fernandes JA, Ramos AI, Braga SS, Almeida Paz FA.
PMID: 21589345
Acta Crystallogr Sect E Struct Rep Online. 2010 Nov 27;66:m1689-90. doi: 10.1107/S1600536810049196.

The title compound is a co-crystal of the cis and trans isomers, namely cis-bis-[1,1,1,5,5,5-hexa-fluoro-pentane-2,4-dionato(1-)-κ(2)O,O']bis-(4-phenyl-pyridine N-oxide-κO)copper(II)-trans-bis-[1,1,1,5,5,5-hexa-fluoro-pentane-2,4-dionato(1-)-κ(2)O,O']bis(4-phenyl-pyridine N-oxide-κO)copper(II) (2/1), [Cu(C(5)HF(6)O(2))(2)(C(11)H(9)NO)(2)]. In both isomers, the coordination geometry of the Cu(2+) atom is octa-hedral, exhibiting typical Jahn-Teller distortion. The metal atom of the...

1,3-Dicyclo-hexyl-imidazolidine-2,4,5-trione.

Acta crystallographica. Section E, Structure reports online

Talhi O, Fernandes JA, Pinto DC, Silva AM, Almeida Paz FA.
PMID: 22199753
Acta Crystallogr Sect E Struct Rep Online. 2011 Dec 01;67:o3243. doi: 10.1107/S1600536811046253. Epub 2011 Nov 09.

The title compound, C(15)H(22)N(2)O(3), has been isolated as a by-product of an oxidative cleavage of the C-C bond linking two five-membered rings of 1,3-dicyclo-hexyl-5-(3-oxo-2,3-dihydro-benzofuran-2-yl)imidazolidine-2,4-dione. Individual mol-ecular units are engaged in weak C=O⋯C=O inter-actions [O⋯C = 2.814 (10) and 2.871...

Showing 1 to 12 of 86 entries