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Page 1
Why Nature Chose Potassium.
Danchin A, Nikel PI. Danchin A, et al. J Mol Evol. 2019 Dec;87(9-10):271-288. doi: 10.1007/s00239-019-09915-2. Epub 2019 Oct 28. J Mol Evol. 2019. PMID: 31659374 Review.
Yet, the involvement of the alkali metal potassium cation (K(+)) is somewhat of a mystery for most scenarios of origins of life, as this element is less abundant than its sodium counterpart in sea water, the original medium bathing the majority of proposed sites as …
Yet, the involvement of the alkali metal potassium cation (K(+)) is somewhat of a mystery for most scenarios of origins of lif …
Potassium selective calix[4]semitubes.
Webber PR, Cowley A, Drew MG, Beer PD. Webber PR, et al. Chemistry. 2003 Jun 6;9(11):2439-46. doi: 10.1002/chem.200204518. Chemistry. 2003. PMID: 12794888
Molecular modelling studies, using structural models derived from crystallographic data, suggest the potassium cation is complexed by a horizontal, side-on route and not through the calix[4]arene annulus. ...
Molecular modelling studies, using structural models derived from crystallographic data, suggest the potassium cation is compl …
(18-Crown-6)potassium [(1,2,5,6-η)-cyclo-octa-1,5-diene][(1,2,3,4-η)-naph-tha-lene]-ferrate(-I).
Brennessel WW, Ellis JE. Brennessel WW, et al. Acta Crystallogr Sect E Struct Rep Online. 2012 Oct 1;68(Pt 10):m1230-1. doi: 10.1107/S160053681203704X. Epub 2012 Sep 1. Acta Crystallogr Sect E Struct Rep Online. 2012. PMID: 23125569 Free PMC article.
Each (naphthalene)(1,5-cod)ferrate(-I) anion is in contact with one (18-crown-6)potassium cation via KC contacts to the outer four carbon atoms of the naphthalene ligand (cod = 1,5-cyclo-octa-diene, 18-crown-6 = 1,4,7,10,13,16-hexa-oxacyclo-octa-deca-ne). ...
Each (naphthalene)(1,5-cod)ferrate(-I) anion is in contact with one (18-crown-6)potassium cation via KC contacts to the outer …
The Trifluoromethyl Anion.
Lishchynskyi A, Miloserdov FM, Martin E, Benet-Buchholz J, Escudero-Adán EC, Konovalov AI, Grushin VV. Lishchynskyi A, et al. Angew Chem Int Ed Engl. 2015 Dec 7;54(50):15289-93. doi: 10.1002/anie.201507356. Epub 2015 Oct 26. Angew Chem Int Ed Engl. 2015. PMID: 26499207
First evidence for the existence of free trifluoromethyl anion CF3 (-) has been obtained. The 3D-caged potassium cation in [K(crypt-222)](+) is inaccessible to CF3 (-) , thus rendering it uncoordinated ("naked"). ...
First evidence for the existence of free trifluoromethyl anion CF3 (-) has been obtained. The 3D-caged potassium cation in [K( …
Poly[diaqua-tetra-μ-seleno-cyanato-cadmium(II)dipotassium(I)].
Reinert T, Boeckmann J, Jess I, Näther C. Reinert T, et al. Acta Crystallogr Sect E Struct Rep Online. 2010 Sep 8;66(Pt 10):i70-i71. doi: 10.1107/S1600536810034938. Acta Crystallogr Sect E Struct Rep Online. 2010. PMID: 21587346 Free PMC article.
The asymmetric unit consists of one cadmium and one potassium cation, two bridging seleno-cyanate anions and one water mol-ecule. The polymeric subunits are further connected via the seleno-cyanate anions into a three-dimensional coordination network. ...
The asymmetric unit consists of one cadmium and one potassium cation, two bridging seleno-cyanate anions and one water mol-ecu …
Poly[diaqua-[3,5-bis-(trifluoro-meth-yl)pyrazolido]potassium].
Phan HN, Lerner HW, Bolte M. Phan HN, et al. Acta Crystallogr Sect E Struct Rep Online. 2010 Jul 14;66(Pt 8):m928. doi: 10.1107/S1600536810027133. Acta Crystallogr Sect E Struct Rep Online. 2010. PMID: 21588161 Free PMC article.
The water mol-ecules and 3,5-bis-(trifluoro-meth-yl)pyrazolide anions act as bridges between the potassium cations. Each potassium cation is surrounded by four O atoms [K-O = 2.705 (3)-2.767 (3) A] and four F atoms [K-F = 2.870 (7)-3.215 (13) A]. ...
The water mol-ecules and 3,5-bis-(trifluoro-meth-yl)pyrazolide anions act as bridges between the potassium cations. Each potassium …
(18-Crown-6-κO)(pyrazolato-κN,N')-potassium(I).
Kunz K, Lerner HW, Bolte M. Kunz K, et al. Acta Crystallogr Sect E Struct Rep Online. 2009 Jan 10;65(Pt 2):m171. doi: 10.1107/S1600536808043237. Acta Crystallogr Sect E Struct Rep Online. 2009. PMID: 21581778 Free PMC article.
The asymmetric unit of the title compound, [K(C(3)H(3)N(2))(C(12)H(24)O(6))], is composed of a potassium cation bonded to the six O atoms of a crown ether mol-ecule and the two N atoms of a pyrazolate anion. ...
The asymmetric unit of the title compound, [K(C(3)H(3)N(2))(C(12)H(24)O(6))], is composed of a potassium cation bonded to the …
Poly[(μ-5,7-dihydr-oxy-4-oxo-2-phenyl-4H-chromene-8-sulfonato)potassium(I)].
Liu B, Yang BL. Liu B, et al. Acta Crystallogr Sect E Struct Rep Online. 2008 Dec 13;65(Pt 1):m66-7. doi: 10.1107/S1600536808041779. Acta Crystallogr Sect E Struct Rep Online. 2008. PMID: 21581534 Free PMC article.
In the polymeric title compound, [K(C(15)H(9)O(7)S)](n), the potassium cation is five-coordinated by four sulfonate O atoms and one carbonyl O atom. ...
In the polymeric title compound, [K(C(15)H(9)O(7)S)](n), the potassium cation is five-coordinated by four sulfonate O atoms an …
Poly[dipotassium [(μ6-2,2',2'',2'''-{[pyrazine-2,3,5,6-tetra-yltetra-kis-(methyl-ene)]tetra-kis-(sulfanedi-yl)}tetra-acetato)-disilver(I)] 5.2-hydrate].
Pacifico J, Stoeckli-Evans H. Pacifico J, et al. IUCrdata. 2022 Feb 1;7(Pt 2):x220077. doi: 10.1107/S2414314622000773. eCollection 2022 Feb. IUCrdata. 2022. PMID: 36340876 Free PMC article.
The asymmetric unit is composed of half a binuclear silver complex located about a center of symmetry, a potassium cation and 2.6 disordered water mol-ecules. The whole binuclear silver complex is generated by inversion symmetry with the pyrazine ring being located …
The asymmetric unit is composed of half a binuclear silver complex located about a center of symmetry, a potassium cation and …
Potassium [(1S)-1-azido-2-phenyl-eth-yl]trifluorido-borate.
Lejon T, Gorovoy AS, Khrustalev VN. Lejon T, et al. Acta Crystallogr Sect E Struct Rep Online. 2012 Aug 1;68(Pt 8):m1048. doi: 10.1107/S1600536812030085. Epub 2012 Jul 10. Acta Crystallogr Sect E Struct Rep Online. 2012. PMID: 22904724 Free PMC article.
The organic anions and potassium cations are tightly bound to each other by the coordination K-F [2.654 (3)-3.102 (3) A] and K-N [2.951 (4)-3.338 (4) A] inter-actions. Thus, the potassium cation adopts a nine-vertex coordination polyhedron, which can be described as …
The organic anions and potassium cations are tightly bound to each other by the coordination K-F [2.654 (3)-3.102 (3) A] and K-N [2.951 (4)- …
195 results