CRYSTAL-STRUCTURE OF EUROPIUM TRICHLORIDE TETRAPYRIDINE

The crystal of europium trichloride tetrapyridine （EuC13·4Py） belongs to the monoclinic system. The space group is P21/n, with α=15.925（4）, b=17.225（5）, c=9.780（7）A, β=103.28（2）°, Z=4. The intensity dataof 5045 independent reflections were collected using a PW-1100 four-circle diffractometer. The structure was solved by the heavy-atom method. The structure parameters were refined by block-diagonal least-squares method, final discrepancy R=0.073. A slightly distorted pentago..