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[Bis(2,6-diiso-propyl-phen-yl) phosphato-κ O ]pentakis-(methanol-κ O )manganese bis-(2,6-diiso-propyl-phen-yl) phosphate methanol tris-olvate.

The title compound, [Mn(C24 H34 O4 P)(CH3 OH)5 ](C24 H34 O4 P)·3CH3 OH, was formed in the reaction between a hydrate of a manganese(II) salt [either Mn(NO3 )2 (H2 O)6 or MnCl2 (H2 O)4 ] with a methanol solvate of lithium bis-(2,6-diiso-propyl-phen-yl) phosphate, {Li[OOP(O-2,6- i Pr2 C6 H3 )2 ]·(CH4 O)3 }·CH4 O, in methanol. The structure has monoclinic ( Cc ) symmetry at 150 K. The complex consists of an [Mn{OOP(O-2,6- i Pr2 C6 H3 )2 }(CH3 OH)5 ]+ cation, an [OOP(O-2,6- i Pr2 C6 H3 )2 ]- anion and three non-coordinating methanol mol-ecules. The anion demonstrates disorder of an isopropyl group [occupancy ratio is 0.57 (4):0.43 (4)]. The di-aryl-phosphate ligand in the cation exhibits a κ1 O terminal coordination mode. The Mn atom is in a nearly unperturbed octa-hedral environment. The [Mn{OOP(O-2,6- i Pr2 C6 H3 )2 }(CH3 OH)5 ]+ cation exhibits one intra-molecular O-H⋯O bond, and is coordinated via two inter-molecular O-H⋯O hydrogen bonds to the [OOP(O-2,6- i Pr2 C6 H3 )2 ]- anion. The cations, anions and non-coordinating methanol mol-ecules are linked into infinite chains along the c -axis direction via 0-H⋯O hydrogen bonding. The complex is of inter-est as a possible inhibitor for the thermal decomposition of polydi-methyl-siloxane. The crystal studied was refined as an inversion twin with a domain ratio of 0.47 (3):0.53 (3).

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