(Me3Sn)2SbSb(SnMe3)2, 1∞-verknüpfte SbSb-Hanteln in einem thermochromen Distiban mit Schweratomgerüst

Oligosilanylated Antimony Compounds

“…A particularly interesting aspect of several distibines is their thermochromic behavior. Distibines of the type [R 2 Sb] 2 (R = alky and aryl, EMe 3 (E = Si, 19 Ge, 19 Sn 20 )) have therefore been studied intensively by UV–vis spectroscopy. Although the origin for the thermochromic property is not completely clear, one of the explanations involves intermolecular alignment in the solid state with rather short Sb···Sb distances (ca.…”

“…Containing Sb–Sb bonds, compound 9 and distibines 3 , 6 , and 11 are likely the most interesting compounds from a structural point of view. Intramolecular Sb–Sb distances of structurally characterized distibines as found in the Cambridge Crystallographic Database 26 comprise a range from 2.827 to 2.883 Å 26 with [(Me 3 Sn) 2 Sb] 2 20 featuring the longest bond. In comparison to the already known data, the Sb–Sb bond distances of 3 (Figure 3 ), 6 (Figure 5 ), 9 (Figure 6 ), and 11 (Figure 7 ) are at the upper end of the expected range (2.85–2.88 Å).…”

“…21 This goes along with a change from red color for the solid phase to yellow for phases in solution. The low-energy bands of [(Me 3 Si) 2 Sb] 2 (λ solid = 530 nm, λ solv = 430 nm), 19 [(Me 3 Ge) 2 Sb] 2 (λ solid = 520 nm, λ solv = 400 nm), 19 and [(Me 3 Sn) 2 Sb] 2 (λ solid = 510 nm, λ solv = 360 nm), 20 are strongly blueshifted. 19 Silylated distibines 3, 6, and 11 in this paper are also red-, orange-, or purple-colored solids; however, upon dissolving them they maintain their color.…”

Structure and Reactivity of 1,8-Bis(naphthalenediyl)dipnictanes

“…[5][6][7] In addition, some dipnictanes are thermochromic, which refers to the color change that occurs upon melting. [8][9][10][11][12][13][14] The thermochromic effect most likely results from the breakage of intermolecular metal•••metal interactions, which exist in the solid state but disappear in the liquid state. [15][16][17][18][19][20][21][22][23][24][25][26][27][28][29] Apart from the identification of attractive intermolecular interactions in such molecules, their coordination chemistry has also been studied.…”

“…Dipnictanes R 2 E–ER 2 contain a central E–E bond and the group 15 elements adopt the oxidation state II. The first compound of this type, Me 4 As 2 , which is known as “ fuming arsenical liquid ” or “ Cacodyl ”, was prepared by Louis Cadet de Gassicourt in 1760 and later on by Robert Bunsen, whereas the heavier congeners Me 4 Sb 2 and Me 4 Bi 2 were prepared in the early 1930s. , Since distibanes and dibismuthanes exhibit rather weak Sb–Sb and Bi–Bi bonds, they have been studied as promising starting reagents for the synthesis of persistent Sb- and Bi-centered radicals by thermally activated homolytic bond cleavage reactions. − In addition, some dipnictanes are thermochromic, which refers to the color change that occurs upon melting. − The thermochromic effect most likely results from the breakage of intermolecular metal···metal interactions, which exist in the solid state but disappear in the liquid state. − …”