Acta Crystallographica Section C

Crystal Structure Communications

Volume 63, Part 2 (February 2007)

metal-organic compounds


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Acta Cryst. (2007). C63, m36-m41    [ doi:10.1107/S0108270106053601 ]

Pt2II and Pt2III dimers containing a Pt2(2,2'-bipyridine)2([mu]-N,N-dimethylguanidinato)2 unit

K. Sakai, K. Yokokawa and Y. Yokoyama

Abstract: The syntheses and crystal structures of the title Pt2II and Pt2III dimers doubly bridged with N,N-dimethylguanidinate ligands, namely bis([mu]-N,N-dimethylguanidinato)bis[(2,2'-bipyridine)platinum(II)](Pt-Pt) bis(hexafluorophosphate) acetonitrile disolvate, [Pt2II(C3H8N3)2(C10H8N2)2](PF6)2·2CH3CN, (I), and guanidinium bis([mu]-N,N-dimethylguanidinato)bis[(2,2'-bipyridine)sulfatoplatinum(III)](Pt-Pt) bis(hexafluorophosphate) nitrate hexahydrate, (C3H10N3)[PtIII2(C3H8N3)2(SO4)2(C10H8N2)2]NO3·6H2O, (II), are reported. The oxidation of the Pt2II dimer into the Pt2III dimer results in a marked shortening of the Pt-Pt distance from 2.8512 (6) to 2.5656 (4) Å. The change is mainly compensated for by the change in the dihedral angle between the two Pt coordination planes upon oxidation, from 21.9 (2) to 16.9 (3)°. We attribute the relatively strong one-dimensional stack of dimers achieved in the Pt2II compound in part to the strong PtII...C(bpy) associations (bpy is 2,2'-bipyridine) in the crystal structure [Pt...C = 3.416 (10) and 3.361 (12) Å].

Formula: [Pt2(C3H8N3)2(C10H8N2)2](PF6)2·2CH3CN and (C3H10N3)[Pt2(C3H8N3)2(SO4)2(C10H8N2)2]NO3·6H2O

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Structure factor file (CIF format) (424.1 kbytes)
[ doi:10.1107/S0108270106053601/bm3021Isup2.hkl ]
Contains datablock I

hkldisplay filedownload file

Structure factor file (CIF format) (556.3 kbytes)
[ doi:10.1107/S0108270106053601/bm3021IIsup3.hkl ]
Contains datablock II

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