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Kapustyanyk, V. B.; Korchak, Yu.

doi:10.1023/a:1004188825183

Cited by 15 publications

(19 citation statements)

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“…Thermochromism, which involves the color change of a transition-metal complex under thermal excitation, is one of the main research subjects of coordination chemistry. The current researches show that thermochromic materials are used as temperature sensors, thermochromic pigments, temperature indicators, security and novelty printing, coating, as well as in thermography and for recording optical information [9][10][11][12].…”

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confidence: 99%

Synthesis, Structural Characterization and Chromotropism of a Ni(II) and a Co(II) Compound with Acesulfamate as a Ligand

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et al. 2006

Transition Met Chem

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The novel bis(acesulfamato-O)tetraaquanickel(II) and bis(acesulfamato-N)tetraaquacobalt(II) complexes have been synthesized and characterized by elemental analyses, magnetic measurements, u.v.-vis and FT-IR spectra. The thermal behavior of the complexes was also studied by simultaneous TG, DTG and DTA methods in a static air atmosphere. The crystal structure of bis(acesulfamato-O)tetraaquanickel(II) complex has been identified by singlecrystal X-ray diffraction analyses. The acesulfamate ligand (acs) acts as an O-donor through the carbonyl oxygen as a monodentate ligand in the Ni(II) complex. The Ni(II) ion structure resides on a two-fold axis and is coordinated by four aqua ligands defining the basal plane, and by two monodentate acesulfamate ligands occupying the axial positions. The chromotropism of both complexes has been studied using thermal and spectral analysis. The bis(acesulfamato-N)tetraaquacobalt(II)complex is found to be very soluble in water and organic solvents and exhibits a reversible thermochromism from pink to violet depending on deaquation, which occurs in two steps, in the solid state. The bis(acesulfamato-O)tetraaquanickel(II) complex has shown two thermochromic properties one of which is a reversible and changes the color from green to yellow by an endothermic effect, whereas the other one is irreversible and changes from yellow to brown depending on deaquation, in the solid state. The bis(acesulfamato-N)tetraaquacobalt(II) complex exhibits solvatochromism in solvents with different donor number and ionochromism in the presence of various cations in solution.

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Section: Introductionmentioning

confidence: 99%

Synthesis, Structural Characterization and Chromotropism of a Ni(II) and a Co(II) Compound with Acesulfamate as a Ligand

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Çetin

et al. 2006

Transition Met Chem

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“…In this instance, the crystal color is a sensitive indicator of the anion geometry. This enables the anion structure to be determined from the electronic spectrum [1].…”

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Manifestation of a thermochromic phase transition in electronic spectra of C3H7NH3CuCl3 crystals

et al. 2012

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The temperature evolution of absorption spectra of isopropylammonium trichlorocuprate (C 3 H 7 NH 3 CuCl 3 ) crystals was investigated in the energy range 1.77-2.48 eV. It was established that the optical absorption edge was described by the Urbach rule and resulted from exciton-phonon interaction. A comparatively strong exciton-phonon interaction was associated with a band produced by self-trapped excitons. Analysis of the temperature dependences for the Urbach-rule parameters confirmed the existence of a thermochromic phase transition at 325 K.

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“…For the crystals grown from an aqueous solution (from now on, DEACC-II) it was equal to T t = 311 K (in the regime of heating) [2,4].…”

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“…In view of the thermochromic character of the indicated phase transition, absorption spectroscopy has turned out to be an effective tool for studying its nature [4]. The studies of DEACC-II crystals have shown that a phase transition is associated with changes in the coordination surrounding of the copper ion.…”

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Electronic spectra and nature of transitions in [NH2(C2H5)2]2CuxZn1−x Cl4 (x = 0.5, 1) crystals

2004

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The absorption spectra of the [NH 2 (C 2 H 5 ) 2 ] 2 CuCl 4 crystals grown from a solution in ethyl alcohol and also of solid solutions of [NH 2 (C 2 H 5 ) 2 ] 2 Zn 0.5 Cu 0.5 Cl 4 in the visible spectral region have been investigated in the vicinity of thermochromic phase transitions. It is shown that the phenomenon of thermochromism in these crystalline compounds is primarily related to the replacement of the square-planar geometry of the coordination surrounding of the Cu 2+ ion by a tetrahedral one.Introduction. Thermochromic crystals have attracted the attention of researchers in connection with their possible use as sensitive materials of sensor technology and also in recording optical information. The compounds of the group A 2 MeCl 4 and AMeCl 3 (Me = Cu, Co) [1-5] with an alkylammonium cation, to which the crystals of diethylaminetetrachlorocuprate -[NH 2 (C 2 H 5 ) 2 ] 2 CuCl 4 (DEACC) -are related, constitute a new class of thermochromic materials. According to [1], these crystals at T t = 323 K undergo a thermochromic phase transition of the first kind accompanied by a sharp change in the color of a sample from green to yellow in the regime of heating. The hydrogen bonds that influence the degree of deformation of the metal-haloid polyhedra play an important role in the phenomena of thermochromism, which, in turn, is manifested in the change in the absorption spectra.At room temperature, the [NH 2 (C 2 H 5 ) 2 ] 2 CuCl 4 crystals grown from a solution in ethyl alcohol (from now on, DEACC-I) belongs to the space group P2 1 ⁄ n. The parameters of the elementary cell are: a = 7.362 A°, b = 15.025 A°, c = 45.193 A°, β = 89.94 o , and Z = 12. One asymmetric structural group includes three tetrahedrally and nine octahedrally coordinated ions [CuCl 4 ] 2− in an abnormally large cell. All DEA + cations participate in the formation of the two-dimensional network of strong hydrogen bonds N-H⋅⋅⋅Cl parallel to the plane (bc). The high-temperature phase is also monoclinic with the space group P2 1 ⁄ c (a = 25.055 A°, b = 10.531 A°, c = 15.455 A°, β = 100.63 o , and Z = 8) [1].The temperature of the thermochromic phase transition in these crystals is greatly determined by the conditions of their growing. For the crystals grown from an aqueous solution (from now on, DEACC-II) it was equal to T t = 311 K (in the regime of heating) [2,4].In view of the thermochromic character of the indicated phase transition, absorption spectroscopy has turned out to be an effective tool for studying its nature [4]. The studies of DEACC-II crystals have shown that a phase transition is associated with changes in the coordination surrounding of the copper ion. Here, just as in the case of DEACC-I, the high-temperature phase is characterized by a distorted tetrahedral position of the surrounding of the copper ion, whereas the low-temperature one is characterized by the co-existence of the anions of the plane quadratic and tetrahedral forms (each surrounding of the copper ion yields two absorption bands). A sharp change in the config...

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Cited by 15 publications

References 1 publication

Synthesis, Structural Characterization and Chromotropism of a Ni(II) and a Co(II) Compound with Acesulfamate as a Ligand

Synthesis, Structural Characterization and Chromotropism of a Ni(II) and a Co(II) Compound with Acesulfamate as a Ligand

Manifestation of a thermochromic phase transition in electronic spectra of C3H7NH3CuCl3 crystals

Electronic spectra and nature of transitions in [NH2(C2H5)2]2CuxZn1−x Cl4 (x = 0.5, 1) crystals

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