One-dimensional versus three-dimensional order in bis(trimethylenediamine)platinum(II) dichlorobis(trimethylenediamine)platinum(IV) tetrafluoroborate, [Pt(C3H10N2)2][Pt(C3H10N2)2Cl2](BF4)4, bis(trimethylenediamine)platinum(II) dibromobis(trimethylenediamine)platinum(IV) perchlorate, [Pt(C3H10N2)2][PtBr2(C3H10N2)2](ClO4)4 and bis(trimethylenediamine)platinum(II) dibromobis(trimethylenediamine)platinum(IV) tetrafluoroborate, [Pt(C3H10N2)2][PtBr2(C3H10N2)2](BF4)4. A re-refinement of their crystal structures