In the first part of this thesis, the self-assembly and on-surface reaction of alkyne derivative precursors, namely triethynylmethanol-, triethynylbenzene-, and triethynyltriazine-derivatives, towards functionalized nanostructures are investigated on the coinage metal surfaces Au(111), Ag(111) and Cu(111) using scanning tunneling microscopy. The spodium–π bonding further complements the concept of the spodium bond and provides a wider range of research on the adjustment of the strength of spodium bond.įunctionalized nanostructures on surfaces are prospective candidates for future applications such as molecular electronic devices, gas sensors or protective coatings. The spodium–π interaction is dominated by electrostatic interaction in most complexes, whereas dispersion and electrostatic energies are responsible for the stability of the MX2 With the increase of electronegativity of the substituents on the Lewis acid or its decrease in the Lewis base, the interaction energies increase and vice versa.
Spodium–π bonding exhibits a partially covalent nature characterized with a negative energy density and large interaction energy. NCI, AIM, and electron density shifts analyses further, indicating that the spodium–π bonding exists in the binary complexes. For the T form, the X–M–X axis adopts a cross configuration with the molecular axis of C≡C or C=C, but both of them are parallel in the P form. Two types of structures of cross (T) and parallel (P) forms are obtained. The spodium–π bonding between MX2 (M = Zn, Cd, and Hg X = Cl, Br, and I) acting as a Lewis acid, and C2H2/C2H4 acting as a Lewis base was studied by ab initio calculations. Treatment of AuL (L = ethylene, tBuNC, PPh3 and THT) in κ2-NN chelating, κ1-N central, and κ1-N terminal coordination modes of triazapentadienyl ligand have also been investigated by using DFT.
THE COINAGE METALS COPPER SILVER AND GOLD SERIES
A series of thermally stable, easily isolable, monomeric, and isoleptic coinage metal alkyne complexes have been reported.
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