Na(5)Sn(13): A New Zintl Phase with a Complex Network Structure Constructed from Tin Pentagons.
The compound Na(5)Sn(13) forms in the sodium-tin system in high yield following prolonged reaction of a quenched mixture at 280 degrees C in a Ta container. The compound exhibits a complex three-dimensional structure (29 independent atoms) built mainly of 4-bonded tin atoms in interbonded pentagons (orthorhombic, space group Cmcm (No. 63); a = 8.979(1) Å, b = 19.448(6) Å, c = 50.43(2) Å, Z = 16). According to Zintl-Klemm electron-counting formalisms, the compound has a closed-shell electronic configuration with the number of 3-bonded Sn(-) equal to the number of sodium cations. Property measurements show that the compound is diamagnetic.
Vaughey
J. T.
JT
Ames Laboratory(1) and Department of Chemistry, Iowa State University, Ames, Iowa 50011.
Corbett
John D.
JD