Disulfur dinitride
Disulfur dinitride is the chemical compound with the formula Template:Chem2.
Preparation and reactions
Passing gaseous [[tetrasulfur tetranitride|Template:Chem2]] over silver metal wool at 250–300 °C at low pressure (1 mmHg) yields cyclic Template:Chem2. The silver reacts with the sulfur produced by the thermal decomposition of the Template:Chem2 to form [[silver sulfide|Template:Chem2]], and the resulting Template:Chem2 catalyzes the conversion of the remaining Template:Chem2 into the four-membered ring Template:Chem2,[1]
An alternative uses the less explosive Template:Chem2.[2]Template:Cln
Template:Chem2 decomposes explosively above 30°C, and is shock sensitive.[1] It readily sublimes, and is soluble in diethyl ether. Traces of water cause it to polymerize into Template:Chem2.[2] In the solid state it spontaneously polymerizes forming [[polythiazyl|Template:Chem2]].[1] It forms adducts with Lewis acids via a nitrogen atom, e.g. Template:Chem2, Template:Chem2, Template:Chem2, Template:Chem2.[2][3]
Structure and bonding
The Template:Chem2 molecule is a four-membered ring, with alternating S and N atoms. The Template:Chem2 molecule is a resonance hybrid of many contributing structures. In one of those structures, one S atom has valence 4 and the other S atom has valence 2, and both N atoms has valence 3. In the other structure both S atoms have valence 2 and both N atoms has valence 3, and one of the S atoms has a charge of +1, and one of the N atoms has a charge of −1. The molecule is almost square and planar. The S–N bond lengths are 165.1 pm and 165.7 pm and the bond angles are very close to 90°.[1] The Template:Chem2 molecule is isoelectronic with the cyclic Template:Chem2 dication and has 6π electrons.[2] The bonding has been investigated using a spin-coupled valence bond method [4] and is described as having four framework sigma bonds, with the N atoms bearing a high negative charge and the S atoms a corresponding positive charge. Two π electrons from the sulfur atoms are coupled across the ring making the molecule overall a singlet diradical.
See also
References
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