Two Diammonium Copper Azides with Similar Layerlike Magnetic Substructures Made of Chains of Serially Connected Cu₆ Rings Show Cation‐Modulated Magnetism

Abstract

S. Ikeda and A. Okamoto have designed a doubly fluorescence-labeled nucleoside and observe an absorption band at approximately 480 nm when the probe is in a single-stranded state, whereas an absorption band at approximately 510 nm becomes predominant when the probe is hybridized with the complementary strand. This clear change in fluorescence intensity that is dependent on hybridization is useful for visible gene analysis. For more information, see their Full Paper "Hybridization-Sensitive On-Off DNA Probe: Application of the Exciton Coupling Effect to Effective

Homoleptic manganese(II)–azide layer: Synthesis, structural characterization and magnetic properties

“…Several systems with the alkali-metal Cs + or alkyl ammoniums such as R 4 N + (R = Me, Et, n-Pr) and dmenH 2 2+ (N,N 0 -dimethylethylenediammonium) have been reported. Most of them are Cu(II) compounds with discrete (0D) or extended (1D) Cu x (N 3 ) y substructures [17][18][19]. Two Mn(II) compounds in which the cations (Cs + or Me 4 N + ) are embedded in the three-dimensional anionic host frameworks of [Mn(N 3 ) 3 ] n have also been reported [20][21][22].…”

“…Particular interest has been focused on the azido ligand for its diversity in coordination modes and efficiency in magnetic coupling, and a large number of azido-bridged complexes with different dimensionalities and various topologies have been reported in the literature [4][5][6]. These complexes can be divided into two classes besides the neutral binary metal azides [7,8]: (i) heteroleptic complexes with coligands [9][10][11][12][13][14][15][16] and (ii) homoleptic anionic ones with charge-balancing cations that may act as templates for the anionic metal-azide substructures [17][18][19][20][21][22]. Considerable progress has been made in the synthesis and characterization of the former class, but the latter class has been relatively rarely explored.…”

Molecular layer consisting of linear Azido-bridged heptanuclear copper unit: In-situ synthesis, structure and magnetic property

“…The magnetic behavior is similar to that of compound (dmenH 2 )[Cu 6 (N 3 ) 14 ], [28] which is explained to display a global long-range AF ordering in the low-temperature region but short-range FM in the hightemperature region. In our case, the anionic magnetic layers are separated much more by the larger cations in 1 than dmenH 2 2+ and trimenH 2 2+ in the reported result, with the shortest interlayer Cu⋯Cu separation being 13.681 Å versus 9.106 Å for trimenH 2 2+ and 8.016 Å for dmenH 2…”

“…Interestingly, the variation in the size of the cations yielded diverse copper(II)-azido nuclearities as well as magnetic properties. More importantly, Gao's group reported two new Cu-azide compounds (dmenH 2 )[Cu 6 (N 3 ) 14 ] and (trimenH 2 )[Cu 6 (N 3 ) 14 ] (dmenH 2 2+ : N,N′-dimethylethylenediammonium; trimenH 2 2+ : N,N,N′-trimethylethylenediammonium) with an interesting cation-sized modulated magnetic property [28]. It is of interest to note that in these reported compounds, the cationic templates belong to protonated polyalkylamine or tetraalkylammonium cationic species, a new type of organic cationic templates is to be explored.…”

A two-dimensional copper polymer constructed from rod-shaped ferromagnetic secondary building units

“…The Cu2 is four-coordination described as distorted square planar. The basal Cu-N bond lengths are in the range of 1.972-2.005 Å which is identical to Cu-azide compounds [32][33][34][35], and the apical Cu-N bond lengths is 2.442 (3) (Fig. 2).…”