Synthesis of Gold Complexes From Diphosphine Ligands and Screening Reactions of Heterocyclic Acetylacetonato (ACAC) Ligands with Transitional Metal Complexes Page: 48
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P-Au-Cl is 178.3(2) in C27H23AuClOP, whereas in [Au2Cl2(bpcd)] P-Au-Cl values are
172.69(6) 0 and 173.72(6) . Weakness or lack of Au.------Au interaction in C27H23AuClOP
could be the reason why the P-Au-Cl angle is larger and closer to linear as expected in
complexes with a coordination number (CN) of 2. The X-ray molecular structure of
C27H23AuClOP is given in Figure 4.3.
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Figure 4.3. Molecular Structure of C27H23AuCIOP. Maier, A.F.G et al. Eur.
J.Org. 2014, 4515-4522. Permission to reproduce this figure has been granted by ACS.
4.2.3 [Au2Cl2(bpcd)] versus [Au(PEt3)Cl]
The two compounds bear some similarities. First, both compounds crystallize in a
monoclinic crystal system. Second, in both compounds there are four molecules of gold (I)
complex per unit cell; therefore, Z = 4. Third, in both compounds the coordination number (CN)
of the gold (I) complex is 2. Two ligands connected to gold (I) atoms are trans to each other,
thereby forcing a linear geometry on a complex. Furthermore, in both cases the oxidation state of
gold (I) is +1.
There are also some differences between the two compounds. First, [Au(PEt3)Cl]77 is
mononuclear while [Au2Cl2(bpcd)] is dinuclear. In solid state there is very little of the
Au.---Au interaction {3.615(2) A} seen in [Au(PEt3)Cl]. This interaction is strongly observed48
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Nyamwihura, Rogers. Synthesis of Gold Complexes From Diphosphine Ligands and Screening Reactions of Heterocyclic Acetylacetonato (ACAC) Ligands with Transitional Metal Complexes, thesis, August 2015; Denton, Texas. (https://digital.library.unt.edu/ark:/67531/metadc804890/m1/61/: accessed July 16, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; .