The Hexaammine Copper(II) Fluoride Monohydrate [Cu(NH₃)₆][F(H₂O)F]: Synthesis and Crystal Structure

Abstract

We report the synthesis and crystal structure of the monohydrate of hexaammine copper(II) difluoride, [Cu(NH3)6]F2 · H2O, which was synthesized from CuF2 · 2 H2O in liquid ammonia. The compound crystallizes in the chiral space group P3221 (no. 154) as traffic-blue, plate-shaped crystals with a = 6.738(1), c = 18.210(6) Å, V = 715.9(3) Å3 at 150 K with Z = 3. It contains the rare [F(H2O)F2- anion bound by strong O-H···F hydrogen bonding.

Fluoroferrates with (dabcoH2)2+ or (dabcoH)+ Cations

“…In III , (110) [(Fe 2 F 10 ) · 10H 2 O] sheets are described as [11$\bar{}$ 0] water ribbons linked by Fe 2 F 10 dimers (Figure 6 bottom), in which O–H ··· F and O–H ··· O bond lengths are in the range of 2.60–2.64 Å and 2.71–2.84 Å, respectively. These O–H ··· F bonds are quite strong; they are comparable to that found in the rare [F(H 2 O)F] anion of [Cu(NH 3 ) 6 ][F(H 2 O)F], 2.621 Å36 or [Cd(NH 3 ) 6 ][F(H 2 O)F] 2.614 Å 37. Inter‐layer O–H ··· N (2.85 to 2.88 Å) and N–H ··· F (2.89 to 3.18 Å) bonds ensure the stability of the 3D network.…”