Pyridineboronic Acids as Useful Building Blocks in Combination with Perchloroplatinate(II) and -(IV) Salts: 1D, 2D, and 3D Hydrogen-Bonded Networks Containing X-H•••Cl2Pt- (X = C+), B(OH)2•••Cl2Pt-, and B(OH)2•••(HO)2B Synthons

Five metal complexes have been prepared by reacting 3- and 4-pyridineboronic acid (3- and 4-pba) with potassium tetrachloroplatinate (K2PtCl4) and hexachloroplatinic(IV) acid hydrate (H2PtCl6 center dot aq): [4-pbaH](2)[PtCl4], [3-pbaH](2)[PtCl4], [4-pbaH][Pt(4-pba)Cl-3], cis-[Pt(4-pba)(2)Cl-2] center dot H2O, and cis-[Pt-IV(3-pba)(2)Cl-4]center dot 2H(2)O. All compounds have been characterized by single-crystal X-ray diffraction analysis, showing that the primary hydrogen bonding interactions of the resulting 1D, 2D, and 3D networks contain at least one of the following synthons: X-H center dot center dot center dot Cl2Pt (X = C, N+), B(OH)(2)center dot center dot center dot Cl2Pt-, and B(OH)2 center dot center dot center dot(HO),B. The dimensions are enhanced further by secondary N-H center dot center dot center dot ClPt, O-H center dot center dot center dot O, and O-H center dot center dot center dot ClPt hydrogen bonding interactions between donor and acceptor atoms located at the periphery of these synthons. Additional weak C-H center dot center dot center dot O, C-H center dot center dot center dot Cl, B center dot center dot center dot N, and pi center dot center dot center dot pi stacking interactions stabilize the crystal structures further.