Abstract
Crystallographic study was performed on the zinc undecanoate Zn(C11H21O2)2 by X-ray diffraction. Three polymorphs A, B and C were identified. The structures of A and B were solved from X-ray diffraction on platelets like single crystals obtained by crystallization in methanol. Polymorph A: SG=P21/c, a=54.411(4)Å, b=4.666(4)Å, c=9.2231(8)Å, β=92.54(7)°, V=2341(2)Å3, Z=4; polymorph B: SG=Cc, a=53.451(2)Å, b=4.707(1)Å, c=9.178(1)Å, β=91.53(7)°, V=2308(2)Å3, Z=4. Polymorph C has been detected in powder samples obtained by precipitation in aqueous solution. Its structure was solved from X-ray synchrotron diffraction data: SG=Pna21, a=9.3386(6)Å, b=4.7393(3)Å, c=54.646(5)Å, V=2418.5(3)Å3 and Z=4. The three polymorphs have the usual layered structures encountered in zinc linear carboxylates series with Zn atoms in tetrahedral O-coordination. The forms A and C have the same building blocks but differ by their stacking. Two adjacent layers are 180° rotated around the short and the long axis in A and C respectively. The form B presents conformational disorder leading to modification of the preceding layers. In these form, the layers maintain the same orientation along the stacking direction.
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