An infrared and electronic spectroscopic study of a series of nickel(II) amine complexes

Using the solvothermal approach five new tin-sulfur compounds were synthesized. All compounds exhibit a direct covalent bond between the thiostannate unit and the charge compensating transition metal TM 2+ ion, leading to the formation of discrete neutral molecules, chains or layered structures. In the structures, the [Sn 2 S 6 ] 4anion is connected to the TM 2+ cations in three different ways: (a) only two and opposite terminal S atoms are involved in bonding; (b) the four terminal S atoms connect two different complexes, and (c) the four terminal S atoms link four complexes. The compounds are:

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“…2.4 eV) and 3 A 2g → 3 T 1g ( 3 P) (ca. 3.2 eV) and are in the same range as for the related compounds with 2,2′‐bipy and 4,4′‐bipy …”

Section: Resultsmentioning

confidence: 62%

Transition Metal Complexes with Linkage to the Thiostannate Units Forced by Suitable Amine Molecules

Hilbert

Pienack

Lühmann

et al. 2016

Z. Anorg. Allg. Chem.

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“…1.4 eV) and 3 A 2g → 3 T 1g ( 3 F) (ca. 2.4 eV) . Hence the purple color of the samples is caused by the d–d transitions.…”

Section: Resultsmentioning

confidence: 99%

Fast Room Temperature Synthesis of the Thiostannate [Ni(2amp)₃]₂[Sn₂S₆]·9.5H₂O: Crystal Structure and Properties

Hilbert

Näther

Bensch

2017

Zeitschrift anorg allge chemie

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“…In this region, all the samples showed several absorption bands, more or less intense: a doublet at around 2940 and 2890 cm -1 typical of C-H stretching vibrations and two bands at around 3330 and 3284 cm -1 characteristic of N-H 2 stretching vibrations (the latter observed only in sample EnNi3, Figure 8c) from en ligands complexing Ni 2+ in an octahedral symmetry. 43 Dried EnNi1 sample (Figure 8a) showed the two bands at 2944 and 2894 cm -1 characteristic of C-H stretching vibrations in a rather even distribution along the cross-section of the pellets. These indicated a uniform profile of en groups on the support agreeing with the uniform distribution of [Ni(en)(H 2 O) 4-x (Al-O) x ] +2-x (x ) 1 or 2) species proposed from the UV-vis data (Figure 6b).…”

Section: Dryingmentioning

confidence: 99%

Effect of the Nickel Precursor on the Impregnation and Drying of γ-Al₂O₃ Catalyst Bodies: A UV−vis and IR Microspectroscopic Study

2008

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The elemental preparation steps of impregnation and drying of Ni/γ-Al 2 O 3 catalyst bodies have been studied by combining UV-vis and IR microspectroscopy. The influence of the number of chelating ligands in [Ni(en) 2+ precursor complexes (with en ) ethylenediamine and x ) 0-3) has been investigated. UV-vis measurements after impregnation showed that, regardless of the en:Ni 2+ ratio in the precursor solution, Ni 2+ was already detected in the core of the pellets 5 min after impregnation. The alumina support did bring about, however, gradients in the nature of the Ni 2+ species upon first contact with the lowest en:Ni 2+ ratio solutions, but these gradients disappeared after 30-60 min of impregnation. After 60 min, UV-vis seemed to indicate Ni-O-Al interactions between Ni 2+ and the support, when water was initially part of the first coordination sphere of Ni 2+ , which was supported with the results obtained after drying. For dried samples, UV-vis showed a gradient of [Ni(en) x (H 2 O) 6-2x ] 2+ inside the pellets, with an en-poor region in the core and an en-rich region in the edges of the catalyst bodies, when [Ni(en) were the starting complexes. IR microspectroscopy confirmed these en radial profiles, while EDX measurements showed that an Ni 2+ egg-shell distribution goes hand-in-hand with an egg-shell distribution of en. The number of en ligands determined the interactions of Ni 2+ with the support after impregnation and controlled the redistribution of metal-ion species during drying. Moreover, when redistribution of Ni 2+ occurred during drying, its transport toward the outer rim of the extrudates came about together with changes of the local en:Ni 2+ ratio.

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An infrared and electronic spectroscopic study of a series of nickel(II) amine complexes

Cited by 17 publications

References 21 publications

Transition Metal Complexes with Linkage to the Thiostannate Units Forced by Suitable Amine Molecules

Transition Metal Complexes with Linkage to the Thiostannate Units Forced by Suitable Amine Molecules

Fast Room Temperature Synthesis of the Thiostannate [Ni(2amp)₃]₂[Sn₂S₆]·9.5H₂O: Crystal Structure and Properties

Effect of the Nickel Precursor on the Impregnation and Drying of γ-Al₂O₃ Catalyst Bodies: A UV−vis and IR Microspectroscopic Study

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An infrared and electronic spectroscopic study of a series of nickel(II) amine complexes

Cited by 17 publications

References 21 publications

Transition Metal Complexes with Linkage to the Thiostannate Units Forced by Suitable Amine Molecules

Transition Metal Complexes with Linkage to the Thiostannate Units Forced by Suitable Amine Molecules

Fast Room Temperature Synthesis of the Thiostannate [Ni(2amp)3]2[Sn2S6]·9.5H2O: Crystal Structure and Properties

Effect of the Nickel Precursor on the Impregnation and Drying of γ-Al2O3 Catalyst Bodies: A UV−vis and IR Microspectroscopic Study

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Fast Room Temperature Synthesis of the Thiostannate [Ni(2amp)₃]₂[Sn₂S₆]·9.5H₂O: Crystal Structure and Properties

Effect of the Nickel Precursor on the Impregnation and Drying of γ-Al₂O₃ Catalyst Bodies: A UV−vis and IR Microspectroscopic Study