[Cu(HF2)(pyz)2]BF4 (pyz = pyrazine): long-range magnetic ordering in a pseudo-cubic coordination polymer comprised of bridging HF2 and pyrazine ligands

[Cu(HF2)(pyz)2]BF4 consists of rare µ1,3 bridging HF2 anions and µ-pyrazine ligands leading to a 3D pseudo-cubic framework that antiferromagnetically orders below 1.54(1) K.