Structural changes in insoluble metal nitroprussides on ageing

Reguera, E.; Dago, A.; Gómez, Ariel; Bertrán, José Fernández

doi:10.1016/0277-5387(95)00582-x

Cited by 32 publications

(47 citation statements)

References 19 publications

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“…3,4,19 For Zn 2+ the obtained crystals are hexagonal (R3) trihydrates. 2 When these trihydrates, both monoclinic and hexagonal, are air-dried they lose a water molecule to form orthorhombic (Pnma) dihydrates, 19 which are the stable phases for these four cations. With the exception of the ferrous salt, the same orthorhombic (Pnma) dihydrates are obtained when the samples are prepared using the precipitation method.…”

Section: Resultsmentioning

confidence: 98%

On the Microporous Nature of Transition Metal Nitroprussides

et al. 2003

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Nitroprussides of divalent transition metals form a family of microporous molecular materials. Their properties in this sense depend on the transition metal cation involved and also on the preparative method, which determine their crystal structures. The stable phases of this family of materials belong to one of the following crystal structures: orthorhombic (Pnma) (Mn 2+ , Fe 2+ , Cu 2+ , Zn 2+ , and Cd 2+ ), cubic (Fm3m) (Co 2+ and Ni 2+ ), and orthorhombic (Amm2) (Cu 2+ ). These materials are stable up to above 160°C, while their dehydration takes place around 100°C. On dehydration, Amm2 copper complex changes into a tetragonal (I4mm) phase. The microporous nature of these materials is discussed according to their crystal structure and correlating structural and adsorption data. The accessibility to the pore system was evaluated through adsorption of H 2 O, CO 2 , and N 2 . Pores of both orthorhombic and cubic structures are accessible to H 2 O and CO 2 in experiments carried out at 23 and 0°C, respectively; however, they are inaccessible to N 2 at -196°C. This behavior is discussed as related to the large polarizing power of the nitrosyl (NO) ligand which distorts the local environment of the iron atom and reduces the effective window cross section. The small pores of tetragonal copper nitroprusside were inaccessible to the adsorbates used.

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Section: Resultsmentioning

confidence: 98%

On the Microporous Nature of Transition Metal Nitroprussides

et al. 2003

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“…Taking into account this geometry and the length of the b axis (6.4080 A), the two space groups containing planes of symmetry were discarded and we propose P2 symmetry for the studied compound. In a previous paper (Reguera et al, 1996) several insoluble metal nitroprussides were found unstable when they were studied as fresh aged samples. However, in the study of fresh and aged Ag 2 [Fe(CN) 5 NO] samples, no structural changes were observed.…”

Section: B X-ray Powder Diffraction Datamentioning

confidence: 98%

Powder X-ray diffraction study of disilver(1⁺) pentacyanonitrosylferrate(2⁻)

1999

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The crystal structure of disilver(l + ) pentacyanonitrosylferrate(2~) was studied by X-ray powder diffraction. IR and Mossbauer spectroscopies, thermogravimetric analysis and density measurements were also carried out. This compound is monoclinic, and its lattice parameters are: a=10.986(3) A, b = 6.4080 (10) A, c = 7.4545(19) A, a=<5=90°, /3=102.54°(2). © 7999 International Centre for Diffraction Data. [S0885-7156(98)00404-7]

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“…The solids formed in the absence of imidazole (3D phases [14] ) contain a single CN stretching band, indicating that the five CN groups form bridges between the metal centers. These spectra show two bands for the CN stretching mode, with a frequency difference of about 20 cm -1 .…”

Section: Spectroscopic and Thermal Characterizationmentioning

confidence: 99%

“…[5] The exfoliation of layered solids is the source of large 2D building blocks to prepare 3D porous frameworks by crystal engineering routes, for example, by intercalating pillar species between neighboring layers. This series of coordination compounds is usually obtained as 3D solids, [14] ex-cept for a copper(II) phase, which has a layered structure. The stacking of the aromatic rings from neighboring molecules deviates from the sandwichtype configuration, which in turn weakens the magnetic interactions between T 2+ cations located in neighboring layers.…”

Section: Introductionmentioning

confidence: 99%

Layered Transition Metal Nitroprussides – Their Preparation, Crystal Structure, and Magnetic Properties

et al. 2016

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Divalent transition metal (T) nitroprussides form a series of insoluble coordination compounds, which generally crystallize in 3D frameworks, except for a layered (2D) phase of copper. In this contribution, the preparation of layered phases for T = Mn, Fe, Co, Ni, Zn, and Cd is reported. The incorporation of imidazole (Im) during their preparation by the precipitation method inhibits the coordination of the axial CN groups to the metal T, and layered (2D) structures of formula unit T(Im) 2 [Fe(CN) 5 NO] result. The metal T is found coordinated to the N end of the equatorial CN groups. Imidazole molecules occupy its axial coordination sites. In the interlayer region, imid- [a]

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Structural changes in insoluble metal nitroprussides on ageing

Cited by 32 publications

References 19 publications

On the Microporous Nature of Transition Metal Nitroprussides

On the Microporous Nature of Transition Metal Nitroprussides

Powder X-ray diffraction study of disilver(1⁺) pentacyanonitrosylferrate(2⁻)

Layered Transition Metal Nitroprussides – Their Preparation, Crystal Structure, and Magnetic Properties

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Structural changes in insoluble metal nitroprussides on ageing

Cited by 32 publications

References 19 publications

On the Microporous Nature of Transition Metal Nitroprussides

On the Microporous Nature of Transition Metal Nitroprussides

Powder X-ray diffraction study of disilver(1+) pentacyanonitrosylferrate(2−)

Layered Transition Metal Nitroprussides – Their Preparation, Crystal Structure, and Magnetic Properties

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Powder X-ray diffraction study of disilver(1⁺) pentacyanonitrosylferrate(2⁻)