The molecular structure and organization of self-assembled monolayers (SAMs) and multilayer films grafted onto Au/Si(1 1 1) surfaces of mononuclear transition metal dialkynyl bridged Pd(II) complexes trans-[HS-Pd(PBu3)(2)-SH] (1), trans-[HS-Pd(PBu3)(2)(-C C-C6H5)] (2) and of the binuclear complex trans, trans-[HS-Pd(PBu3)(2)(-C C-C6H4-C6H4-C C-Pd(PBu3)(2)-SH] (3), have been investigated by extended X-ray absorption fine structure spectroscopy in total reflection conditions (reflEXAFS). ReflEXAFS analysis of the data lead to determine the local structure around Pd atoms, assessing the square-planar geometry around the transition metal in the multilayers case, preserved in the monolayer regime. The investigation on the SAMs also provided the assessment of the S-Au bond length and Pd-S-Au bond angle and on the molecular orientation on the gold substrate of the complexes, confirmed by quantum chemical calculations. (C) 2010 Elsevier B.V. All rights reserved.
EXAFS in total reflection (reflEXAFS) for the study of organometallic Pd(II) thiol complexes based self-assembled monolayers on gold / C., Battocchio; Fratoddi, Ilaria; Venditti, Iole; V. g., Yarzhemsky; Yu V., Norov; Russo, Maria Vittoria; G., Polzonetti. - In: CHEMICAL PHYSICS. - ISSN 0301-0104. - STAMPA. - 379:1-3(2011), pp. 92-98. [10.1016/j.chemphys.2010.11.010]
EXAFS in total reflection (reflEXAFS) for the study of organometallic Pd(II) thiol complexes based self-assembled monolayers on gold
FRATODDI, Ilaria;VENDITTI, Iole;RUSSO, Maria Vittoria;
2011
Abstract
The molecular structure and organization of self-assembled monolayers (SAMs) and multilayer films grafted onto Au/Si(1 1 1) surfaces of mononuclear transition metal dialkynyl bridged Pd(II) complexes trans-[HS-Pd(PBu3)(2)-SH] (1), trans-[HS-Pd(PBu3)(2)(-C C-C6H5)] (2) and of the binuclear complex trans, trans-[HS-Pd(PBu3)(2)(-C C-C6H4-C6H4-C C-Pd(PBu3)(2)-SH] (3), have been investigated by extended X-ray absorption fine structure spectroscopy in total reflection conditions (reflEXAFS). ReflEXAFS analysis of the data lead to determine the local structure around Pd atoms, assessing the square-planar geometry around the transition metal in the multilayers case, preserved in the monolayer regime. The investigation on the SAMs also provided the assessment of the S-Au bond length and Pd-S-Au bond angle and on the molecular orientation on the gold substrate of the complexes, confirmed by quantum chemical calculations. (C) 2010 Elsevier B.V. All rights reserved.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
