Correlation of Structure and Triboluminescence for Tetrahedral Manganese(II) Compounds

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Abstract
To investigate the structural basis of triboluminescence, several known tetrahedrally coordinated Mn(II) complexes have been synthesized according to literature methods and their crystal structures have been determined by X-ray diffraction. Among them, (MePh3P)2[MnCl4] (2), a = 15.4804(4) Å, cubic, space group P213, Z = 4; (Et4N)2[MnBr4] (4), a = 13.362(1) Å, c = 14.411(1) Å, tetragonal, space group P4̄21m, Z = 4; MnBr2(OPPh3)2 (7), a = 9.974(1) Å, b = 10.191(3) Å, c = 10.538(2) Å, α = 65.32(1)°, β = 63.49(1)°, γ = 89.44(2)°, triclinic, space group P1, Z = 1; and MnBr2(OAsPh3)2 (10), a = 17.816(3) Å, b = 10.164(1) Å, c = 18.807(3) Å, orthorhombic, space group Pca21, Z = 4 were reported to be triboluminescent and (Me4N)2[MnCl4] (3), a = 9.016(3) Å, b = 36.90(2) Å, c = 15.495(3) Å, β = 90.72(3)°, monoclinic, space group P21/n, Z = 12, and MnI2(OAsPh3)2 (11), a = 10.094(4) Å, b = 10.439(2) Å, c = 34.852(2) Å, α = 83.17(4)°, β = 86.09(2)°, γ = 75.16(3)°, triclinic, space group P1̄, Z = 4, were reported to be not triboluminescent. The result supports the correlation between space group acentricity and triboluminescence activity.