N. Marion, S. Diez-gonzalez, and S. Nolan, N-Heterocyclic Carbenes as Organocatalysts, Angewandte Chemie International Edition, vol.8, issue.17, p.2988, 2007.
DOI : 10.1002/anie.200603380

D. Enders, O. Niemeier, and A. Henseler, Organocatalysis by N-Heterocyclic Carbenes, Chemical Reviews, vol.107, issue.12, p.5606, 2007.
DOI : 10.1021/cr068372z

O. Holloczki, Z. Kelemen, and L. Nyulaszi, On the Organocatalytic Activity of N-Heterocyclic Carbenes: Role of Sulfur in Thiamine, The Journal of Organic Chemistry, vol.77, issue.14, p.6014, 2012.
DOI : 10.1021/jo300745e

F. Hahn and M. Jahnke, Heterocyclic Carbenes: Synthesis and Coordination Chemistry, Angewandte Chemie International Edition, vol.47, issue.618, p.3122, 2008.
DOI : 10.1002/anie.200703883

D. P. Curran, A. Solovyev, M. Makhlouf, L. Fensterbank, M. Malacria et al., Synthesis and Reactions of N-Heterocyclic Carbene Boranes, Angewandte Chemie International Edition, vol.333, issue.44, p.10294, 2011.
DOI : 10.1002/anie.201102717

W. A. Herrmann, N-Heterocyclic Carbenes: A New Concept in Organometallic Catalysis, Angewandte Chemie International Edition, vol.40, issue.618, p.1290, 2002.
DOI : 10.1002/1521-3773(20020415)41:8<1290::AID-ANIE1290>3.0.CO;2-Y

O. Schuster, L. Yang, H. G. Raubenheimer, and M. Albrecht, -Heterocyclic Carbenes: Abnormal, Remote, and Other Classes of NHC Ligands with Reduced Heteroatom Stabilization, Chemical Reviews, vol.109, issue.8, p.3445, 2009.
DOI : 10.1021/cr8005087

URL : https://hal.archives-ouvertes.fr/hal-01258127

R. H. Crabtree, Abnormal, mesoionic and remote N-heterocyclic carbene complexes, Coordination Chemistry Reviews, vol.257, issue.3-4, p.755, 2013.
DOI : 10.1016/j.ccr.2012.09.006

M. N. Hopkinson, C. Richter, M. Schedler, and F. Glorius, An overview of N-heterocyclic carbenes, Nature, vol.5, issue.7506, p.485, 2014.
DOI : 10.1038/nature13384

D. Martin, N. Lassauque, B. Donnadieu, and G. Bertrand, A Cyclic Diaminocarbene with a Pyramidalized Nitrogen Atom: A Stable N-Heterocyclic Carbene with Enhanced Electrophilicity, Angewandte Chemie International Edition, vol.7, issue.25, p.6172, 2012.
DOI : 10.1002/anie.201202137

A. Kausamo, H. M. Tuononen, K. E. Krahulic, and R. Roesler, -Heterocyclic Carbenes with Inorganic Backbones:?? Electronic Structures and Ligand Properties, Inorganic Chemistry, vol.47, issue.3, p.1145, 2008.
DOI : 10.1021/ic7020929

X. Hu, Y. Tang, P. Gantzel, and K. Meyer, Silver Complexes of a Novel Tripodal N-Heterocyclic Carbene Ligand:?? Evidence for Significant Metal???Carbene ??-Interaction, Organometallics, vol.22, issue.4, p.612, 2003.
DOI : 10.1021/om020935j

X. Hu, I. Castro-rodriguez, K. Olsen, and K. Meyer, Group 11 Metal Complexes of N-Heterocyclic Carbene Ligands:?? Nature of the MetalCarbene Bond, Organometallics, vol.23, issue.4, p.755, 2004.
DOI : 10.1021/om0341855

S. Fantasia, J. L. Petersen, H. Jacobsen, L. Cavallo, and S. P. Nolan, Electronic Properties of N-Heterocyclic Carbene (NHC) Ligands:?? Synthetic, Structural, and Spectroscopic Studies of (NHC)Platinum(II) Complexes, Organometallics, vol.26, issue.24, p.5880, 2007.
DOI : 10.1021/om700857j

D. J. Nelson and S. P. Nolan, Quantifying and understanding the electronic properties of N-heterocyclic carbenes, Chemical Society Reviews, vol.46, issue.16, p.6723, 2013.
DOI : 10.1039/C3CY00118K

D. M. Khramov, V. M. Lynch, and C. W. Bielawski, N-Heterocyclic Carbene???Transition Metal Complexes:?? Spectroscopic and Crystallographic Analyses of ??-Back-bonding Interactions, Organometallics, vol.26, issue.24, p.6042, 2007.
DOI : 10.1021/om700591z

D. Marchione, L. Belpassi, G. Bistoni, A. Macchioni, F. Tarantelli et al., The Chemical Bond in Gold(I) Complexes with N-Heterocyclic Carbenes, Organometallics, vol.33, issue.16, p.4200, 2014.
DOI : 10.1021/om5003667

H. Jacobsen, A. Correa, C. Costabile, and L. Cavallo, ??-Acidity and ??-basicity of N-heterocyclic carbene ligands. A computational assessment, Journal of Organometallic Chemistry, vol.691, issue.21, p.4350, 2006.
DOI : 10.1016/j.jorganchem.2006.01.026

M. Alcarazo, T. Stork, A. Anoop, W. Thiel, and A. Fürstner, Steering the Surprisingly Modular ??-Acceptor Properties of N-Heterocyclic Carbenes: Implications for Gold Catalysis, Angewandte Chemie International Edition, vol.47, issue.14, p.2542, 2010.
DOI : 10.1002/anie.200907194

R. Tonner, G. Heydenrych, and G. Frenking, Bonding Analysis of N-Heterocyclic Carbene Tautomers and Phosphine Ligands in Transition-Metal Complexes: A Theoretical Study, Chemistry ??? An Asian Journal, vol.1, issue.239, p.1555, 2007.
DOI : 10.1002/asia.200700235

M. Srebro and A. Michalak, Theoretical Analysis of Bonding in N-Heterocyclic Carbene???Rhodium Complexes, Inorganic Chemistry, vol.48, issue.12, p.5361, 2009.
DOI : 10.1021/ic900336r

J. C. Bernhammer, G. Frison, and H. V. Huynh, Electronic Structure Trends in N-Heterocyclic Carbenes (NHCs) with Varying Number of Nitrogen Atoms and NHC???Transition-Metal Bond Properties, Chemistry - A European Journal, vol.49, issue.38, p.12892, 2013.
DOI : 10.1002/chem.201301093

URL : https://hal.archives-ouvertes.fr/hal-00847378

B. Ines, M. Patil, J. Carreras, R. Goddard, W. Thiel et al., Synthesis, Structure, and Reactivity of a Dihydrido Borenium Cation, Angewandte Chemie International Edition, vol.129, issue.36, p.8400, 2011.
DOI : 10.1002/anie.201103197

H. V. Huynh and G. Frison, Electronic Structural Trends in Divalent Carbon Compounds, The Journal of Organic Chemistry, vol.78, issue.2, p.328, 2013.
DOI : 10.1021/jo302080c

URL : https://hal.archives-ouvertes.fr/hal-00767561

C. Dyker, V. Lavallo, B. Donnadieu, and G. Bertrand, Synthesis of an Extremely Bent Acyclic Allene (A ???Carbodicarbene???): A Strong Donor Ligand, Angewandte Chemie International Edition, vol.32, issue.8850, p.3206, 2008.
DOI : 10.1002/anie.200705620

E. Aldeco-perez, A. J. Rosenthal, B. Donnadieu, P. Parameswaran, G. Frenking et al., Isolation of a C5-Deprotonated Imidazolium, a Crystalline "Abnormal" N-Heterocyclic Carbene, Science, vol.326, issue.5952, p.556, 2009.
DOI : 10.1126/science.1178206

G. T. Velde, F. M. Bickelhaupt, E. J. Baerends, C. F. Guerra, and S. Gisbergen, Chemistry with ADF, Journal of Computational Chemistry, vol.104, issue.180, p.931, 2001.
DOI : 10.1002/jcc.1056

P. S. Bagus and F. Illas, Decomposition of the chemisorption bond by constrained variations: Order of the variations and construction of the variational spaces, The Journal of Chemical Physics, vol.96, issue.12, p.8962, 1992.
DOI : 10.1063/1.462875

T. Ziegler and A. Rauk, A theoretical study of the ethylene-metal bond in complexes between copper(1+), silver(1+), gold(1+), platinum(0) or platinum(2+) and ethylene, based on the Hartree-Fock-Slater transition-state method, Inorganic Chemistry, vol.18, issue.6, p.1558, 1979.
DOI : 10.1021/ic50196a034

T. Ziegler and A. Rauk, Carbon monoxide, carbon monosulfide, molecular nitrogen, phosphorus trifluoride, and methyl isocyanide as .sigma. donors and .pi. acceptors. A theoretical study by the Hartree-Fock-Slater transition-state method, Inorganic Chemistry, vol.18, issue.7, p.1755, 1979.
DOI : 10.1021/ic50197a006

M. P. Mitoraj, A. Michalak, and T. Ziegler, A Combined Charge and Energy Decomposition Scheme for Bond Analysis, Journal of Chemical Theory and Computation, vol.5, issue.4, p.962, 2009.
DOI : 10.1021/ct800503d

M. Mitoraj and A. Michalak, Natural orbitals for chemical valence as descriptors of chemical bonding in transition metal complexes, Journal of Molecular Modeling, vol.18, issue.2, p.347, 2007.
DOI : 10.1007/s00894-006-0149-4

S. Klein, R. Tonner, and G. Frenking, Carbodicarbenes and Related Divalent Carbon(0) Compounds, Chemistry - A European Journal, vol.21, issue.264, p.10160, 2010.
DOI : 10.1002/chem.201000174

H. B. Kraatz, H. Jacobsen, T. Ziegler, and P. M. Boorman, .pi.-Acidity of thioethers and selenoethers: truth or fiction? A comparative density functional study, Organometallics, vol.12, issue.1, p.76, 1993.
DOI : 10.1021/om00025a016

R. R. Rodrigues, C. L. Dorsey, C. A. Arceneaux, and T. W. Hudnall, Phosphaalkene vs. phosphinidene: the nature of the P???C bond in carbonyl-decorated carbene ??? PPh adducts, Chem. Commun., vol.47, issue.2, p.162, 2013.
DOI : 10.1039/C3CC45134H

O. Back, M. Henry-ellinger, C. D. Martin, D. Martin, and G. Bertrand, P???NMR Chemical Shifts of Carbene-Phosphinidene Adducts as an Indicator of the ??-Accepting Properties of Carbenes, Angewandte Chemie International Edition, vol.127, issue.10, p.2939, 2013.
DOI : 10.1002/anie.201209109

A. Liske, K. Verlinden, H. Buhl, K. Schaper, and C. Ganter, Se NMR Chemical Shifts of Their Selenium Adducts, Organometallics, vol.32, issue.19, p.5269, 2013.
DOI : 10.1021/om400858y