A series of rare earth element (REE) mixed-anion 5,5′azobis(1H-tetrazol-1-ide)-carbonate ([REE 2 (ZT) 2 CO 3 (H 2 O) 10 ]· 2H 2 O; REE = lanthanides plus yttrium) coordination compounds were synthesized, characterized, and analyzed. Syntheses by simple metathesis reactions under a CO 2 atmosphere were carried out at ambient (La-Gd and Ho) and elevated pressures (55 bar; Tb, Dy, Er, Tm, Yb, and Y). The resulting crystalline materials were characterized principally by single-crystal X-ray diffraction and vibrational spectroscopy (infrared and Raman). All materials are structurally isotypic, crystallizing in the space [a]

The Front Cover shows a photograph of a geological structure with a small, black hump in the middle: a crystal of gadolinite. The hump symbolizes the gadolinium break. The structure of the featured lanthanide azobis[tetrazolide]‐carbonate reaches from Y to Yb, illustrating the “overcoming” of the gadolinium break. More information can be found in the https://doi.org/10.1002/ejic.201800218 For more on the story behind the cover research, see the https://doi.org/10.1002/ejic.201800446.

Invited for the cover of this issue are the groups of Peter Weinberger from TU Wien, Vienna, Austria, and Georg Steinhauser, Leibniz Universität Hannover, Hanover, Germany. The cover image shows the structure of the featured lanthanide azobis[tetrazolide]‐carbonate reaching from Y to Yb to illustrate the “overcoming” of the gadolinium break.