Abstract
Herein, syntheses, crystal structures, and photoluminescence properties of 24 new ammonia and alkali metal ATCN salts characterized via single-crystal X-ray diffraction are reported. Moreover, ten structure types of these salts have been described, three of which are predominant. Some ATCNs were obtained as two crystalline polymorphs. It was estimated that most ATCN powders exhibited yellow-green fluorescence (at 450-600 nm). For samples that possess fluorescence of low intensity in the solid state, several optical centers of emission exist. It was speculated that the obtained spectral features were due to anion-anion intermolecular interactions. ATCN being a new representative of stable tetracyanoallyl salts is a promising candidate for creation of various 1D, 2D, and 3D supramolecular structures and potential functional materials.
Highlights
The coordination chemistry of salts[1] and coordination polymers[2] containing tetracyanoallyl (TCA) anion has been intensively studied because of the diverse nature of applications and potentially useful properties, such as semiconducting,[3] thermo- and photochromic,[4] magnetic,[5] and photomagnetic properties,[6] of these materials
We examined the fluorescence properties of cesium salt powders in the series 1f, 4f, 3f, and 2f
Some ATCN were obtained as two crystalline polymorphs
Summary
The coordination chemistry of salts[1] and coordination polymers[2] containing tetracyanoallyl (TCA) anion has been intensively studied because of the diverse nature of applications and potentially useful properties, such as semiconducting,[3] thermo- and photochromic,[4] magnetic,[5] and photomagnetic properties,[6] of these materials. We continued the systematic study of new representatives of TCA salts, 2-acyl-1,1,3,3-tetracyanopropenides (ATCN). These salts are stable and can be obtained from readily available reagents.[15] For the obtained salts, the absorption and fluorescence spectra both in the solution and solid state were acquired. The obtained spectral data were compared with the results of X-ray experiments to find out the correlations between ammonia and alkali metal ATCN structure and their fluorescence properties
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