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. Molecular Orbital Theory:. Donor- Acceptor Interactions. Molecular Orbital Theory: Full ML. 6. Molecular Orbital Theory: Simplified. Counting d-electron Configurations. Counting d-electron Configurations. A . ligand. is a species that can donate one or more lone pairs of electrons to form a coordinate bond with a central metal ion. . A central metal ion surrounded by ligands. . This is the . hexaquacopper. COORDINATION COMPLEX – Any ion or neutral species with a metal atom or ion bonded to 2 or more molecules or ions. Zn(NH. 3. ). 4. 2+. Al(OH). 4. -. Charged coordination complexes are called COMPLEX IONS. 1. Do the compounds have the same connectivity?. 2. Stereo Isomerism. Stereo isomers : . They have the same atoms, same sets of bonds, but differ in the relative orientation of these bonds. . . Geometrical Isomers:. Coordination Complexes. d. -block. elements a.k.a. . transition metals. d. -block elements are: . all . metals. all have . partially filled . d. subshells. exhibit horizontal & vertical . similarities. Electronic structures of many . organometallic. compounds are based on a total . valence electron count of 18 on the central metal atom. . Sidgwick. coined the term . ‘inert gas rule’ . for indication of stability of 18e compounds. . Grand Challenge – What controls scavenged TEI distributions and their role in biogeochemistry?. diversity of scavenging TEI rates and . mechanisms. chemical speciation. dominant 'scavenging‘ colloids/particles. Instructor: Dr. Upali Siriwardane e-mail: upali@latech.edu Office: CTH 311 Phone 257-4941 Office Hours: M,W 8:00-9:00 & 11:00-12:00 am; Tu,Th , F 9:30 - 11:30 a.m . April 7 , 2015: Test 1 (Chapters 1,  2, 3) Richie R. . Bhandare. 1*. , . Benjamin Blass. 2. , John Gordon. 2. , Daniel J. Canney. 2*. and . Afzal. Basha Shaikh. 3. 1. . Department. of Pharmaceutical Sciences, . College. of Pharmacy & . Announcements. Today’s Lecture. Transition . Elements (Ch. . 24). Coordination Complexes. Ligand types (last time). Geometries. Naming. Isomers. Bonding in Coordination Complexes - Theory. Chapter 24 Transition Metals. dopamine D4 receptors. Pegi Pavletić. . 1,. *, F. abio. Del . Bello. . 1. , Alessandro Piergentili . 1. , and . Wilma. . Quaglia. . 1. 1. 1. School of Pharmacy, Medicinal Chemistry Unit, . University of . Dr Uwe Grether Ligands and ReceptorsReceptors are important protein structures that allow cells to interact with the world around them (if they are on the cell surface) or help to control the activiti Dr. Mohammed Hussein. M.B.Ch.B, MSC, . PhD, MRCPCH. , DCH (UK). Cellular Communication and Signaling. Types of Signaling. Autocrine. Direct . Signaling. Paracrine. Endocrine. Autocrine Signaling. Autocrine Signaling. Two or more different compounds having the same molecular formula are called isomers and the phenomenon is called isomerism. Isomerism arises due to specific spatial dispositions of the atoms in a molecule. Due to covalence of M-L bonds, many types of isomers occur in co-ordination compounds. However, compared to organic compounds, relatively few inorganic compounds exhibit isomerism. .