
TY  - JOUR
A1  - Davies, Murray S. 
A1  - Fenton, Ronald R. 
A1  - Huq, Fazlul 
A1  - Ling, Edwina C. H. 
A1  - Hambley, Trevor W. 
T1  - Studies on the Nature and Strength of Pt . . .H(-N) Interactions. The Crystal Structures of Chloro[<emph type="2">N</emph>-(2-aminoethyl)-<emph type="2">N</emph>-(2-ammonioethyl)ethane-1,2-diamine]platinum(II) Chloride and Dichloro[4,7-diaza-1-azoniacyclononane]platinum(II) Tetrachlor
JF  - Australian Journal of Chemistry
JO  - Aust. J. Chem.
Y1  - 2000
VL  - 53
IS  - 6
SP  - 451
EP  - 456
KW  - Molecular mechanics; hydrogen bonds; platinum(II); agostic interactions.
UR  - https://doi.org/10.1071/CH00039 
N2  - Two complexes, namely, chloro&#91;N-(2-aminoethyl)-N-(2-ammonioethyl)ethane-1,2-diamine&#93;platinum(II) chloride &#123;&#91;PtCl(tren+H)&#93;Cl2&#125; and dichloro&#91;4,7-diaza-1-azoniacyclononane&#93;platinum(II) tetrachloroplatinate(II)&#8211;water (1/2) &#123;&#91;PtCl2(tacn+H)&#93;2&#91;PtCl4&#93;&#183;2H2O&#125;, have been prepared and structurally characterized by single-crystal X-ray diffractometry as part of a study of the nature and strength of Pt&#183;&#183;&#183;H(&#8211;N) interactions. Crystals of &#91;PtCl(tren+H)&#93;Cl2 are monoclinic, space group P21/c, a 8.293(2), b 14.396(6), c 11.305(3) &#197;, &#946; 107.34(2)&ordm;, Z 4, and the structure has been refined to a residual of 0.042 based on 1631 reflections. Crystals of &#91;PtCl2(tacn+H)&#93;2&#91;PtCl4&#93;&#183;2H2O are monoclinic, space group P21/a, a 12.834(4), b 8.206(4), c 13.116(8) &#197;, &#946; 93.01(4)&#x02DA;, Z 2, and the structure has been refined to a residual of 0.035 based on 1974 reflections. In &#91;PtCl(tren+H)&#93;2+, the protonated amine forms hydrogen bonds with chloride anions and no close contacts with the metal ion. In &#91;PtCl2(tacn+H)&#93;+, a short intramolecular contact is observed between the metal and the protonated amine and the results of molecular mechanics modelling are consistent with there being a Pt&#183;&#183;&#183;H hydrogen bond. Molecular mechanics modelling of &#91;PtCl(tren+H)&#93;2+ and &#91;PtCl2(dien+H)&#93;+ shows that the protonated amines could readily form close contacts with the metal. It is concluded that there is evidence for the formation of Pt&#183;&#183;&#183;H(&#8211;N) hydrogen bonds but these bonds are very weak, being similar or lower in energy than Cl&#183;&#183;&#183;H(&#8211;NPt) hydrogen bonds. 
ER  -

