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Structure and properties of a series of mononuclear manganese(II) complexes with phenyl 2-pyridyl ketoxime (ppkoH) as ligand are presented. [Mn(ClC 6 H 4 COO) 2  (ppkoH) 2 ] · 0.5 CH 3 OH and [Mn(ClC 6 H 4 COO) 2 (ppkoH) 2 ]  ( 1  and  2 ) are isolated from the same reaction system and differ by disordered solvent content and conformation of the complex molecules. [MnCl 2 (ppkoH) 2 ] · 0.02 C 2 H 5 OH  ( 3 ) was obtained in order to modify the central Mn 2+  ion coordination sphere with respect to  1 / 2 . Strong intramolecular hydrogen bonds of the O–H···O and O–H···Cl type are present in  1 / 2  and  3 , respectively. Moreover, weak C–H···O ( 1 – 3 ), C–H···Cl ( 3 ), π···π ( 1 – 2 ) and Cl···π ( 2 ) contacts can be found. The complexes display well-resolved Q-band EPR spectra and may serve as model compounds for further studies.

Mononuclear manganese(II) complexes of phenyl 2-pyridyl ketoxime – models for studies of Q-band EPR properties