Publication Date:
2017-07-05
Description:
The title salt, catena-poly[[[bis(ethylenediamine)platinum(II)]-μ-bromido-[bis(ethylenediamine)platinum(IV)]-μ-bromido] tetrakis(2-bromoethanesulfonate) dihydrate], {[PtIIPtIVBr2(C2H8N2)4](C2H4BrSO3)4·2H2O}n, crystallizes in the space group P21212. It has a linear chain structure extending parallel to the c axis, composed of square-planar [Pt(en)2]2+ and elongated octahedral trans-[PtBr2(en)2]2+ cations (en is ethylenediamine) stacked alternately and bridged by the Br atoms. The Pt site of the [PtII/IV(en)2] unit is located on a general position. The Br site, which is also located on a general position, is equally disordered over two positions. The Pt and Br atoms form a slight zigzag ...Br—PtIV—Br...PtII... chain, with PtIV—Br bond lengths of 2.453 (2) and 2.491 (3) Å, PtII...Br contacts of 3.069 (2) and 3.032 (3) Å, and PtIV—Br...PtII angles of 178.06 (13) and 177.70 (13)°. The mixed-valence state of the Pt site is expressed by the parameter δ = (PtIV–Br)/(PtII...Br), with values of 0.799 and 0.822 for the two independent Br atoms. In the crystal, N—H...O and O—H...O hydrogen bonds between the amine groups of the Pt complex chains, the sulfonate groups and water molecules of crystallization, stabilize the cationic columnar structure.
Keywords:
crystal structureplatinum complexone-dimensional chain complexhalide-bridged complexMX-chain structurePtII,IV mixed valence
Electronic ISSN:
1600-5368
Topics:
Chemistry and Pharmacology
,
Geosciences
Permalink
