Monodentate ligands are sometimes referred to as being "one toothed" because they bind to the central metal atom at one point. Ethylenediamine (en) is a typical bidentate ligand. An example of a bidentate ligand is ethylenediamine. Answer: Try to visualize this...because cyanide is a linear molecule, if the N attaches to metal, then the lone pair on C is pointing 180 degrees away and there is no way for this lone pair to wrap around and bind to the metal. Most cage structures discussed here are of low nuclearity (i.e. Each end of this molecule contains a pair of nonbonding electrons that can form a covalent bond to a metal ion. Coordinate bonds are usually not very strong, do not liberate enough energy and it would thus be more favourable for one of the two $\ce{O-M}$ bonds to be broken leading to acetate as a monodentate ligand. Monodentate means "one-toothed." For example, in the complex [Co(NH 3) 6] 3+, Co 3+ is the central atom and in the co-ordination compound [Pt(NH 3) 4][PtCl 4], Pt 2+ is the central ion. This review mainly covers the ligand shape (length and angle) dependent variation of M n L 2n (M = square-planar coordinated metal center; L = bis-monodentate ligand; n = nuclearity) cage structures. My favourite is probably $\ce{[Cr2(OAc)4(H2O)2]}$ or chromium(II) acetate monohydrate. Other ligands can attach to the metal more than once. The halides, phosphines, ammonia and amines seen previously are monodentate ligands. Non-chelating ligands such as ammonia (NH 3) are monodentate, with one point of attachment (one tooth). Water (H 2 O) and ammonia (NH 3) are examples of neutral monodentate ligands. For example, ammonia and chloride ion are monodentate ligands of copper in the complexes [Cu(NH 3) 6] 2+ and [CuCl 6] 2+. Monodentate ligands bind through only one donor atom. Ligands: The molecular or ionic species which gets attached directly to the central metal atom or ion during the formation of a complex is called a ligand . The lone pair on N is pointing in the opposite direction and cannot bind to the metal. Typical monodentate ligands are given in the figure below. Ethylenediamine is also an example of a chelating ligand. Monodentate ligands are Lewis bases that donate a single pair ("mono") of electrons to a metal atom. The most common example of these types of ligands is EDTA (ethylene di–amine tetra acetic acid). Tridentate ligands have three binding sites. The term "monodentate" can be translated as "one tooth," referring to the ligand binding to the center through only one atom. Ligand Examples . Answer: A monodentate ligand has only one donor atom used to bond to the central metal atom or ion. Bidentate means "two-toothed." Bidentate ligands have two donor sites. Bidentate ligands bind through two donor sites. The same goes if C attaches to the metal. • Ambident Ligand: An ambident ligand is that ligand which binds with the central metal atom or ion through more than one site. Chemists often represent ligands as spheres for simplicity, even though the "sphere" sometimes has three-dimensional structure of its own. Monodentate ligands have one atom that can bind to a central atom or ion. Usually monodentate ligands fall under this category of ligands. A polydentate ligand has more than one donor site. The one example are halide ions such as C r , F − , I − and cyano, etc. Other ligands are described as bidentate because they have two points of attachment. Monodentate ligand is a ligand that has only one atom that coordinates directly to the central atom in a complex. There are, however, exceptions. For example, when chemists draw the structure for [Ni(NH 3) 6] 2+, each ammonia ligand is represented as a sphere.The sphere represents the donor atom of the ligand. 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