6.1.4 other deficient electron compounds Boron group:B、Al、Ga、In、TI AICla,AIBr3,Alla,GaCl3,InCl3 ALCl 225Q 201g dimer in gaseous state and 341pm 108%80°- in solution (<440C) polymer in solid state H3C CH3 70、 CH 3c-2e bond CH CH 120° 214 CH3 CH Al2(CH)dimer in gaseous state and in solution In(CH)3 TI(CH)3 polymer
H3C Al H3C Al C CH3 H3 CH3 CH3 6.1.4 other deficient electron compounds 120º B、Al、Ga、In、Tl dimer in gaseous state and in solution （ 440 C） polymer in solid state Boron group： AlCl3, AlBr3, AlI3, GaCl3, InCl3 Al2Cl6 Al2(CH3)6 dimer in gaseous state and in solution In(CH3)3、Tl(CH3)3 polymer 108° 80°341pm 70º 3c-2e bond
Other deficient electron compounds Me Me e Be e Me, Me Be(CH3)2 13 3c-2e Me bridge B 9 H3 H3 H3 Be Be CH3 HgC- Be CH3 Be Be Be H3 93 9。 dimer (gaseous phase)+trimer polymer (solid state) [Be(CH)212 [Be(CH)2l3 [Be(CH2ln
Be Be Be Be Me Me Me Me Me Me Me Me Be Be Be Be Be Me Me Me Me Me Me Me Me Be 3c-2e Me bridge CH3 Be Be Other deficient electron compounds Be(CH3)2 dimer （gaseous phase）+ trimer polymer（solid state） Be H3 C C H3 Be C H3 H3 C Be H3 C C H3 Be Be H3 C H3C C H3 Be C H3 H3 C Be Be CH3 H3 C H3C C H3 Be CH3 [Be(CH3)2] [Be(CH3)2]2 n [Be(CH3)2]3
Other deficient electron compounds e Me Me B Be Me e Me Be(CH3)2 3c-2e Me bridge K6u (LiCH)4 Li-Li:2.68A C-Li:2.31A 4c-2e Me bridge
Be Be Be Be Me Me Me Me Me Me Me Me Be Be Be Be Be Me Me Me Me Me Me Me Me Be 3c-2e Me bridge CH3 Be Be Li Me Me Li Li Me Li Me 4c-2e Me bridge Other deficient electron compounds Li Li Li (LiCH3)4 Li-Li: 2.68Å C-Li: 2.31Å Be(CH3)2
6.2 Chemical bonds in the coordination compounds What is coordination compounds(metal complex)? compounds composed of a metal atom or ion and one or more ligands. Ligands (with lone pair electrons or n bonds/orbitals) usually donate electrons to the metal(with empty valence orbitals) Includes organometallic compounds e.g. Cisplatin,PtCl2(NH3)2 顺铂 A platinum atom with four ligands
6.2 Chemical bonds in the coordination compounds What is coordination compounds (metal complex)? compounds composed of a metal atom or ion and one or more ligands. – Ligands (with lone pair electrons or bonds/orbitals) usually donate electrons to the metal (with empty valence orbitals) – Includes organometallic compounds Cisplatin, PtCl 2(NH 3)2 顺铂 A platinum atom with four ligands e.g
Coordination numbers and geometries C.N 2 4 6 0-0-0 3 Ag(NH;)2 NiCcI Ni(CN) Fe(CN) Linear Square Tetrahedron Octahedron C.N. 3 5 Hgl, SbCI2 Fe(CO)s Trigonal Planar Square-based Pyramidal Trigonal Bipyramidal
Linear Square Tetrahedron Octahedron C.N 2 4 6 3 2 Ag(NH ) 2 NiCl 4 2 4 Ni(CN ) 3 Fe(CN) 6 Coordination numbers and geometries HgI 3 2 SbCl 5 Fe(CO) 5 Trigonal Planar Square-based Pyramidal Trigonal Bipyramidal C.N. 3 5