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1 SUPPORTING INFORMATION FOR: Trialkylstibine complexes of boron, aluminium, gallium and indium trihalides: synthesis, properties and bonding Victoria K. Greenacre, William Levason and Gillian Reid Chemistry, University of Southampton, Southampton SO17 1BJ. U.K. Supporting Information Table S1: X-ray crystallographic data S2 Computational details S6 Table S2 Bond lengths and angles for optimised free ligands: S7 Table S3 NBO data for free ligands: Sb-C bonds S7 Table S4 Bond lengths and angles of optimised structures: S8 Table S5 NBO data for optimised coordination complexes: Sb-C bonds S11 Table S6 NBO data for optimised coordination complexes: Sb-M bonds S12 Table S7 NBO natural charges of the complexes compared to the individual components MX 3 or the SbR 3 S13 Table S8 Frontier Molecular Orbitals for [MX 3 (SbR 3 )] complexes Figure S1 [BCl 3 (Sb i Pr 3 )] Figure S2 [BBr 3 (SbEt 3 )] Figure S3 [BBr 3 (Sb i Pr 3 )] Figure S4 [BI 3 (SbEt 3 )] Figure S5 [BI 3 (Sb i Pr 3 )] Figure S6 [AlCl 3 (SbEt 3 )] Figure S7 [AlCl 3 (Sb i Pr 3 )] Figure S8 [AlBr 3 (SbEt 3 )] Figure S9 [AlBr 3 (Sb i Pr 3 )] Figure S10 [All 3 (SbEt 3 )] Figure S11 [AlI 3 (SbiPr 3 )] Figure S12 [GaCl 3 (SbEt 3 )] Figure S13 [GaCl 3 (Sb i Pr 3 )] Figure S14 [GaBr 3 (SbEt 3 )] Figure S15 [GaBr 3 (Sb i Pr 3 )] Figure S16 [GaI 3 (SbEt 3 )] Figure S17 [GaI 3 (Sb i Pr 3 )] Figure S18 [InCl 3 (SbEt 3 )] Figure S19 [InCl 3 (Sb i Pr 3 )] Figure S20 [InBr 3 (SbEt 3 )] Figure S21 [InBr 3 (Sb i Pr 3 )] Figure S22 [InI 3 (SbEt 3 )] Figure S23 [InI 3 (Sb i Pr 3 )] S14 S16 S17 S19 S20 S22 S23 S24 S26 S27 S29 S31 S33 S35 S37 S39 S41 S42 S44 S46 S47 S48 S51 S53 S1

2 Table S1 X-ray crystallographic data a Compound [BBr 3 (SbEt 3 )] [BBr 3 (Sb i Pr 3 )] [BCl 3 (Sb i Pr 3 )] Formula C 6 H 15 BBr 3 Sb C 9 H 21 BBr 3 Sb C 9 H 21 BCl 3 Sb M Crystal system orthorhombic monoclinic monoclinic Space group (no.) Pna2 1 (33) P2 1 /c(14) P2 1 /c(14) a /Å (3) (5) (9) b /Å (1) (4) (5) c /Å (1) (5) (8) α / β / (4) (7) γ / U /Å (5) (19) (3) Z µ(mo-k α )/mm F(000) Total number reflns R int Unique reflns No. of params, restraints 206, 7 265, 0 265, 0 GOF R 1, wr 2 [I > 2σ(I)] b 0.024, , , R 1, wr 2 (all data) 0.027, , , a Common items: T = 293 K; wavelength (Mo-K α ) = Å; θ(max) = 27.5 ; b R 1 = Σ F o - F c /Σ F o ; wr 2 =[Σw(F o 2 -F c 2 ) 2 /ΣwF o 4 ] 1/2 S2

3 Compound [BI 3 (SbEt 3 )] [BI 3 (Sb i Pr 3 )] [AlI 3 (Sb i Pr 3 )] Formula C 6 H 15 BI 3 Sb C 9 H 21 BI 3 Sb C 9 H 21 AlI 3 Sb M Crystal system monoclinic orthorhombic monoclinic Space group (no.) P2 1 /c(14) P (19) Cc(9) a /Å (2) (2) (7) b /Å (2) (2) (5) c /Å (3) (3) (7) α / β / (2) (5) γ / U /Å (5) (12) (16) Z µ(mo-k α )/mm F(000) Total number reflns R int Unique reflns No. of params, restraints 103, 0 398, 0 133, 2 GOF R 1, wr 2 [I > 2σ(I)] b 0.018, , , R 1, wr 2 (all data) 0.019, , , S3

4 Compound [GaCl 3 (Sb i Pr 3 )] [GaBr 3 (SbEt 3 )] [GaI 3 (Sb i Pr 3 )] Formula C 9 H 21 Cl 3 GaSb C 6 H 15 Br 3 GaSb C 9 H 21 GaI 3 Sb M Crystal system monoclinic monoclinic monoclinic Space group (no.) P2 1 /n(14) P2 1 /n(14) Cc (9) a /Å (1) (5) (6) b /Å (4) (5) (6) c /Å (2) (10) (7) α / β / (1) (7) (6) γ / U /Å (5) (14) (16) Z µ(mo-k α )/mm F(000) Total number reflns R int Unique reflns No. of params, restraints 133, 0 103, 0 121, 104 GOF R 1, wr 2 [I > 2σ(I)] b 0.032, , , R 1, wr 2 (all data) 0.036, , , S4

5 Compound [InCl 3 (Sb i Pr 3 )] [InCl 3 (SbEt 3 )] [InI 3 (Sb i Pr 3 )] Formula C 9 H 21 Cl 3 InSb C 6 H 15 Cl 3 InSb C 9 H 21 I 3 InSb M Crystal system monoclinic triclinic monoclinic Space group (no.) P2 1 /n(14) P-1 (1) Cc (9) a /Å (4) (7) (1) b /Å (7) (7) (1) c /Å (3) (8) (2) α / (7) 90 β / (5) (7) (1) γ / (6) 90 U /Å (12) (10) (4) Z µ(mo-k α )/mm F(000) Total number reflns R int Unique reflns No. of params, restraints 152, 0 103, 0 133, 2 GOF R 1, wr 2 [I > 2σ(I)] b 0.018, , 0.145, 0.018, R 1, wr 2 (all data) 0.021, , , S5

6 Compound [InI 3 (SbEt 3 )] Formula C 6 H 15 I 3 InSb M Crystal system monoclinic Space group (no.) P2 1 /n(14) a /Å (1) b /Å (2) c /Å (2) α / 90 β / (1) γ / 90 U /Å (4) Z 4 µ(mo-k α )/mm F(000) 1230 Total number reflns R int Unique reflns 3018 No. of params, restraints 103, 0 GOF R 1, wr 2 [I > 2σ(I)] b 0.017, R 1, wr 2 (all data) 0.018, Computational details Calculations were performed using Gaussian 09W, Revision C.01,39 running on an Intel Core i (quad, 3.3 GHz), equipped with 4 GB RAM; results were visualized using GaussView 5.0. Geometry optimisation and frequency calculations were performed on the isolated molecules, and using the B3LYP hybrid density functional, using a basis set with a Stuttgart-Dresden effective core potential on Ga, In, Sb, B and I atoms, with double zeta basis set on H, C, Al and Cl atoms. Minima were characterized by frequency calculations at the same level of theory. NBO calculations were performed at the same level of theory. For the frequency calculation of [InI 3 (SbEt 3 )], there is a small imaginary frequency at 1.56i cm -1 which we conclude is an artefact of the code as a result of the ease of rotation of the InI 3 fragment. S6

7 The supplemental file [MX3(SbR3)].xyz contains the computed Cartesian coordinates of all complexes and free stibine ligands and metal halides. The file may be opened as a text file to read the coordinates, or opened directly by a molecular modelling program such as Mercury (version 3.3 or later, for visualization and analysis. Table S2 Bond lengths/angles for optimised free ligands: Me 3 Sb Sb-C C-Sb-C Et 3 Sb i Pr 3 Sb t Bu 3 Sb Table S3 NBO data for free ligands: Sb-C bonds Contribution (%) Breakdown of Sb contributions (%) Breakdown of C contributions (%) Sb C s p s p Et 3 Sb i Pr 3 Sb Me 3 Sb t Bu 3 Sb S7

8 Table S4 Bond lengths and angles of optimised structures [BCl 3 (Sb i Pr 3 )] DFT X-ray 1 X-ray 2 Sb-B (7) 2.282(7) B-Cl (7) 1.834(7) 1.843(7) 1.834(7) 1.832(7) 1.838(7) Sb-C 2.186(av) 2.146(av) 2.142(av) Cl-B-Cl (4) 111.0(4) 110.9(4) 110.4(4) 111.7(4) 111.5(4) Cl-B-Sb (3) 107.2(3) 110.0(3) 109.6(3) 104.0(3) 109.4(3) C-Sb-C (av) 106.5(av) 104.6(av) [BBr 3 (Sb i Pr 3 )] BBr 3 (SbEt 3 )] X-ray X-ray DFT Molecule 1 Molecule 2 Molecule 1 Molecule 2 DFT Sb-B 2.264(14) 2.250(13) (9) 2.241(9) B-Br 2.003(14) 1.995(15) 2.026(15) 2.001(15) 2.012(15) 2.020(14) (8) 2.013(8) 2.012(9) 2.003(8) 2.009(8) 2.020(8) Sb-C (av) 2.147(av) 2.192(av) 2.132(av) 2.134(av) 2.159(av) 110.3(7) 111.1(6) (4) 111.3(4) Br-B (7) 110.2(7) (4) 110.4(4) Br 111.3(6) 110.1(6) (4) 111.7(4) (6) 110.5(6) (4) 109.1(4) Br-B (6) 107.5(7) (4) 108.4(4) Sb 104.3(6) 107.4(6) (4) 105.7(4) C-Sb-C (av) (av) (av) (av) (av) (av) [BI 3 (Sb i Pr 3 )] BI 3 (SbEt 3 )] X-ray Molecule 1 Molecule 2 Molecule 3 DFT X-ray DFT Sb-B 2.256(5) 2.255(5) 2.255(5) (4) B-I 2.227(5) 2.244(5) 2.230(5) 2.222(5) 2.241(5) 2.232(5) 2.234(5) 2.239(5) 2.230(5) (4) 2.227(4) 2.226(4) Sb-C 2.159(av) 2.159(av) 2.161(av) 2.196(av) 2.126(av) 2.163(av) I-B-I 110.6(2) 111.0(2) 110.1(2) 111.0(2) 110.5(2) 110.0(2) 109.9(2) 110.7(2) 110.7(2) (17) (17) (17) I-B-Sb 106.9(2) 108.7(2) 109.6(2) 109.5(2) 108.1(2) 107.6(2) 108.7(2) 108.2(2) 108.7(2) (16) (17) (17) C-Sb-C (av) (av) (av) (av) (av) (av) S8

9 [AlI 3 (Sb i Pr 3 )] DFT X-ray Sb-Al (9) Al-I (9) 2.507(10) 2.509(9) Sb-C 2.193(av) 2.173(av) (4) I-Al-I (4) I-Al-Sb (3) 109.4(3) 104.8(3) C-Sb-C (av) (av) [GaCl 3 (Sb i Pr 3 )] DFT X-ray Sb-Ga (5) Ga-Cl (12) (12) (12) Sb-C 2.188(av) 2.158(av) Cl-Ga-Cl (5) (5) (5) Cl-Ga-Sb (4) (4) (3) C-Sb-C (av) [GaBr 3 (SbEt 3 )] DFT X-ray Sb-Ga (10) Ga-Br (12) (13) (12) Sb-C 2.167(av) 2.11(av) (5) (5) (5) Br-Ga-Br Br-Ga-Sb (4) (4) (4) C-Sb-C (av) 104.5(av) S9

10 [GaI 3 (Sb i Pr 3 )] DFT Data DFT X-ray Sb-Ga (14) Ga-I (14) (14) (15) Sb-C 2.195(av) 2.147(av) I-Ga-I (5) (5) (5) I-Ga-Sb (5) (5) (5) C-Sb-C (av) 105.3(av) [InCl 3 (Sb i Pr 3 )] [InCl 3 (SbEt 3 )] DFT X-ray DFT X-ray Sb-In (3) (13) In-Cl (6) (6) (6) (4) 2.394(4) 2.379(3) Sb-C 2.189(av) 2.165(av) 2.166(av) 2.126(av) Cl-In-Cl (2) (2) (2) (13) (13) (13) Cl-In-Sb (17) (17) (17) (10) (9) (10) C-Sb-C (av) (av) (av) (av) [InI 3 (Sb i Pr 3 )] [InI 3 (SbEt 3 )] DFT X-ray DFT X-ray Sb-In (3) (3) In-I (17) (4) (3) (3) (3) (3) Sb-C 2.196(av) 2.168(av) 2.169(av) 2.137(av) I-In-I (14) (7) (10) (9) (9) (9) I-In-Sb (9) (8) (14) (9) (9) (9) C-Sb-C (av) (av) (av) 103.7(av) S10

11 Table S5 NBO data for optimised coordination complexes: Sb-C bonds Contribution (%) Breakdown of Sb contributions (%) Breakdown of C contributions (%) Sb C s p s p [BCl 3 (Sb i Pr 3 )] [BBr 3 (Sb i Pr 3 )] [BBr 3 (SbEt 3 )] [BI 3 (Sb i Pr 3 )] [BI 3 (SbEt 3 )] [AlI 3 (Sb i Pr 3 )] [GaCl 3 (Sb i Pr 3 )] [GaBr 3 (SbEt 3 )] [GaI 3 (Sb i Pr 3 )] [InCl 3 (Sb i Pr 3 )] [InCl 3 (SbEt 3 )] [InI 3 (Sb i Pr 3 )] [InI 3 (SbEt 3 )] S11

12 Table S6 NBO data for optimised coordination complexes: Sb-M bonds Contribution (%) Breakdown of Sb contributions (%) Breakdown of M contributions (%) Sb M s p s p [BCl 3 (Sb i Pr 3 )] [BBr 3 (Sb i Pr 3 )] [BBr 3 (SbEt 3 )] [BI 3 (Sb i Pr 3 )] [BI 3 (SbEt 3 )] [AlI 3 (Sb i Pr 3 )] [GaCl 3 (Sb i Pr 3 )] [GaBr 3 (SbEt 3 )] [GaI 3 (Sb i Pr 3 )] [InCl 3 (Sb i Pr 3 )] [InCl 3 (SbEt 3 )] [InI 3 (Sb i Pr 3 )] [InI 3 (SbEt 3 )] S12

13 Table S7 NBO natural charges of the complexes compared to the individual components MX 3 or the SbR 3 [MX 3 (SbR 3 )] MX 3 SbR 3 Bond order Sb M Sb M [BCl 3 (Sb i Pr 3 )] [BBr 3 (Sb i Pr 3 )] [BBr 3 (SbEt 3 )] [BI 3 (Sb i Pr 3 )] [BI 3 (SbEt 3 )] [AlI 3 (Sb i Pr 3 )] [GaCl 3 (Sb i Pr 3 )] [GaBr 3 (SbEt 3 )] [GaI 3 (Sb i Pr 3 )] [InCl 3 (Sb i Pr 3 )] [InCl 3 (SbEt 3 )] [InI 3 (Sb i Pr 3 )] [InI 3 (SbEt 3 )] S13

14 Table S8 Frontier Molecular Orbitals for [MX 3 (SbR 3 )] complexes HOMO-1 HOMO LUMO [BCl 3 (Sb i Pr 3 )] [BBr 3 (Sb i Pr 3 )] [BBr 3 (SbEt 3 )] [BI 3 (Sb i Pr 3 )] [BI 3 (SbEt 3 )] [AlI 3 (Sb i Pr 3 )] [GaCl 3 (Sb i Pr 3 )] S14

15 [GaBr 3 (SbEt 3 )] [GaI 3 (Sb i Pr 3 )] [InCl 3 (Sb i Pr 3 )] [InCl 3 (SbEt 3 )] [InI 3 (Sb i Pr 3 )] [InI 3 (SbEt 3 )] S15

16 Figure S1 [BCl 3 (Sb i Pr 3 )] Figure S1.1 [BCl 3 (Sb i Pr 3 )] 1 H NMR spectrum (CD 2 Cl 2, 298 K): L = free ligand L Figure S1.2 [BCl 3 (Sb i Pr 3 )] 13 C{ 1 H} NMR spectrum (CD 2 Cl 2, 298 K): Figure S1.3 [BCl 3 (Sb i Pr 3 )] 11 B NMR spectrum (CD 2 Cl 2, 298 K): S16

17 Figure S1.4 [BCl 3 (Sb i Pr 3 )] IR spectrum (Nujol): Figure S2 [BBr 3 (SbEt 3 )] Figure S2.1 [BBr 3 (SbEt 3 )] 1 H NMR spectrum (CD 2 Cl 2, 293 K) (* solvent): * S17

18 Figure S2.2 [BBr 3 (SbEt 3 )] 13 C{ 1 H} NMR spectrum (CD 2 Cl 2, 298 K): Figure S2.3 [BBr 3 (SbEt 3 )] 11 B NMR spectrum (CD 2 Cl 2 /CH 2 Cl 2, 293 K): Figure S2.4 [BBr 3 (SbEt 3 )] IR spectrum (Nujol): S18

19 Figure S3 [BBr 3 (Sb i Pr 3 )] Figure S3.1 [BBr 3 (Sb i Pr 3 )] 1 H NMR spectrum (CD 2 Cl 2, 298 K): Figure S3.2 [BBr 3 (Sb i Pr 3 )] 13 C{ 1 H} NMR spectrum (CD 2 Cl 2, 298 K): S19

20 Figure S3.3 [BBr 3 (Sb i Pr 3 )] 11 B NMR spectrum (CD 2 Cl 2, 298 K): Figure S3.4 [BBr 3 (Sb i Pr 3 )] IR spectrum (Nujol): Figure S4 [BI 3 (SbEt 3 )] Figure S4.1 [BI 3 (SbEt 3 )] 1 H NMR spectrum (CD 2 Cl 2, 298 K): S20

21 Figure S4.2 [BI 3 (SbEt 3 )] 13 C{ 1 H} NMR spectrum (CD 2 Cl 2, 298 K): Figure S4.3 [BI 3 (SbEt 3 )] 11 B NMR spectrum (CD 2 Cl 2, 298 K): S21

22 Figure S4.4 [BI 3 (SbEt 3 )] IR spectrum (Nujol): Figure S5 [BI 3 (Sb i Pr 3 )] Figure S5.1 [BI 3 (Sb i Pr 3 )] 1 H NMR spectrum (CD 2 Cl 2, 298 K) (* = solvent): S22

23 * Figure S5.2 [BI 3 (Sb i Pr 3 )] 13 C{ 1 H} NMR spectrum (CD 2 Cl 2, 298 K): Figure S5.3 [BI 3 (Sb i Pr 3 )] 11 B NMR spectrum (CD 2 Cl 2, 298 K): Figure S5.4 [BI 3 (Sb i Pr 3 )] IR spectrum (Nujol): S23

24 Figure S6 [AlCl 3 (SbEt 3 )] Figure S6.1 [AlCl 3 (SbEt 3 )] 1 H NMR spectrum (CD 2 Cl 2, 298 K): Figure S6.2 [AlCl 3 (SbEt 3 )] 13 C{ 1 H} NMR spectrum (CD 2 Cl 2, 298 K): S24

25 Figure S6.3 [AlCl 3 (SbEt 3 )] 27 Al NMR spectrum (CD 2 Cl 2, 298 K): = Al in probe Figure S7 [AlCl 3 (Sb i Pr 3 )] Figure S7.1 [AlCl 3 (Sb i Pr 3 )] 1 H NMR spectrum (CD 2 Cl 2, 298 K): S25

26 Figure S7.2 [AlCl 3 (Sb i Pr 3 )] 13 C{ 1 H} NMR spectrum (CD 2 Cl 2, 298 K): Figure S7.3 [AlCl 3 (Sb i Pr 3 )] 27 Al NMR spectrum (CD 2 Cl 2, 298 K): = Al in probe S26

27 Figure S7.4 [AlCl 3 (Sb i Pr 3 )] IR spectrum (Nujol): Figure S8 [AlBr 3 (SbEt 3 )] Figure S8.1 [AlBr 3 (SbEt 3 )] 1 H NMR spectrum (CD 2 Cl 2, 298 K): = impurities Figure S8.2 [AlBr 3 (SbEt 3 )] 13 C{ 1 H} NMR spectrum (CD 2 Cl 2, 298 K): S27

28 Figure S8.3 [AlBr 3 (SbEt 3 )] 27 Al NMR spectrum (CD 2 Cl 2, 298 K): = Al in probe, = impurity [AlBr - 4 ] Figure S9 [AlBr 3 (Sb i Pr 3 )] Figure S9.1 [AlBr 3 (Sb i Pr 3 )] 1 H NMR spectrum (CD 2 Cl 2, 298 K): S28

29 Figure S9.2 [AlBr 3 (Sb i Pr 3 )] 13 C{ 1 H} NMR spectrum (CD 2 Cl 2, 298 K): = impurities Figure S9.3 [AlBr 3 (Sb i Pr 3 )] 27 Al NMR spectrum (CD 2 Cl 2, 298 K): = Al in probe, = impurity [AlBr 4 ] - S29

30 Figure S9.4 [AlBr 3 (Sb i Pr 3 )] IR spectrum (Nujol): Figure S10 [All 3 (SbEt 3 )] Figure S10.1 [AlI 3 (SbEt 3 )] 1 H NMR spectrum (CD 2 Cl 2, 298 K): S30

31 Figure S10.2 [AlI 3 (SbEt 3 )] 13 C{ 1 H} NMR spectrum (CD 2 Cl 2, 298 K): Figure S10.3 [AlI 3 (SbEt 3 )] 27 Al NMR spectrum (CD 2 Cl 2, 298 K): = Al in probe S31

32 Figure S11 [AlI 3 (Sb i Pr 3 )] Figure S11.1 [AlI 3 (Sb i Pr 3 )] 1 H NMR spectrum (CD 2 Cl 2, 298 K): Figure S11.2 [AlI 3 (Sb i Pr 3 )] 13 C{ 1 H} NMR spectrum (CD 2 Cl 2, 298 K): S32

33 Figure S11.3 [AlI 3 (Sb i Pr 3 )] 27 Al NMR spectrum (CD 2 Cl 2, 298 K): = Al in probe Figure S11.4 [AlI 3 (Sb i Pr 3 )] IR spectrum (Nujol): S33

34 Figure S12 [GaCl 3 (SbEt 3 )] Figure S12.1 [GaCl 3 (SbEt 3 )] 1 H NMR spectrum (CD 2 Cl 2, 298 K): Figure S12.2 [GaCl 3 (SbEt 3 )] 13 C{ 1 H} NMR spectrum (CD 2 Cl 2, 298 K): S34

35 Figure S12.3 [GaCl 3 (SbEt 3 )] 171 Ga NMR spectrum (CD 2 Cl 2, 298 K): Figure S12.4 [GaCl 3 (SbEt 3 )] IR spectrum (Nujol): S35

36 Figure S13 [GaCl 3 (Sb i Pr 3 )] Figure S13.1 [GaCl 3 (Sb i Pr 3 )] 1 H NMR spectrum (CD 2 Cl 2, 298 K): Figure S13.2 [GaCl 3 (Sb i Pr 3 )] 13 C{ 1 H} NMR spectrum (CD 2 Cl 2, 298 K): S36

37 Figure S13.3 [GaCl 3 (Sb i Pr 3 )] 71 Ga NMR spectrum (CD 2 Cl 2, 298 K): Figure S13.4 [GaCl 3 (Sb i Pr 3 )] IR spectrum (Nujol): S37

38 Figure S14 [GaBr 3 (SbEt 3 )] Figure S14.1 [GaBr 3 (SbEt 3 )] 1 H NMR spectrum (CD 2 Cl 2, 298 K): Figure S14.2 [GaBr 3 (SbEt 3 )] 13 C{ 1 H} NMR spectrum (CD 2 Cl 2, 298 K): S38

39 Figure S14.3 [GaBr 3 (SbEt 3 )] 71 Ga NMR spectrum (CD 2 Cl 2, 298 K): Figure S14.4 [GaBr 3 (SbEt 3 )] IR spectrum (Nujol): S39

40 Figure S15 [GaBr 3 (Sb i Pr 3 )] Figure S15.1 [GaBr 3 (Sb i Pr 3 )] 1 H NMR spectrum (CD 2 Cl 2, 298 K): Figure S15.2 [GaBr 3 (Sb i Pr 3 )] 13 C{ 1 H} NMR spectrum (CD 2 Cl 2, 298 K): S40

41 Figure S15.3 [GaBr 3 (Sb i Pr 3 )] 71 Ga NMR spectrum (CD 2 Cl 2, 298 K): Figure S15.4 [GaBr 3 (Sb i Pr 3 )] IR spectrum (Nujol): S41

42 Figure S16 [GaI 3 (SbEt 3 )] Figure S16.1 [GaI 3 (SbEt 3 )] 1 H NMR spectrum (CD 2 Cl 2, 298 K): Figure S16.2 [GaI 3 (SbEt 3 )] 13 C{ 1 H} NMR spectrum (CD 2 Cl 2, 298 K): Figure S16.3 [GaI 3 (SbEt 3 )] 71 Ga NMR spectrum (CD 2 Cl 2, 298 K): S42

43 Figure S16.4 [GaI 3 (SbEt 3 )] IR spectrum (Nujol): Figure S17 [GaI 3 (Sb i Pr 3 )] Figure S17.1 [GaI 3 (Sb i Pr 3 )] 1 H NMR spectrum (CD 2 Cl 2, 298 K): S43

44 Figure S17.2 [GaI 3 (Sb i Pr 3 )] 13 C{ 1 H} NMR spectrum (CD 2 Cl 2, 298 K): Figure S17.3 [GaI 3 (Sb i Pr 3 )] 71 Ga NMR spectrum (CD 2 Cl 2, 298 K): S44

45 Figure S17.4 [GaI 3 (Sb i Pr 3 )] IR spectrum (Nujol): Figure S18 [InCl 3 (SbEt 3 )] Figure S18.1 [InCl 3 (SbEt 3 )] 1 H NMR spectrum (CD 2 Cl 2, 298 K): S45

46 Figure S18.2 [InCl 3 (SbEt 3 )] 13 C{ 1 H} NMR spectrum (CD 2 Cl 2, 298 K): Figure S18.3 [InCl 3 (SbEt 3 )] IR spectrum (Nujol): S46

47 Figure S19 [InCl 3 (Sb i Pr 3 )] Figure S19.1 [InCl 3 (Sb i Pr 3 )] 1 H NMR spectrum (CD 2 Cl 2, 298 K): Figure S19.2 [InCl 3 (Sb i Pr 3 )] 13 C{ 1 H} NMR spectrum (CD 2 Cl 2, 298 K): S47

48 Figure S19.3 [InCl 3 (Sb i Pr 3 )] IR spectrum (Nujol): Figure S20 [InBr 3 (SbEt 3 )] Figure S20.1 [InBr 3 (SbEt 3 )] 1 H NMR spectrum (CD 2 Cl 2, 298 K): S48

49 Figure S20.2 [InBr 3 (SbEt 3 )] 13 C{ 1 H} NMR spectrum (CD 2 Cl 2, 298 K): Figure S20.3 [InBr 3 (SbEt 3 )] 115 In NMR spectrum (CD 2 Cl 2, 298 K): Figure S20.4 [InBr 3 (SbEt 3 )] IR spectrum (Nujol): S49

50 Figure S21 [InBr 3 (Sb i Pr 3 )] Figure S21.1 [InBr 3 (Sb i Pr 3 )] 1 H NMR spectrum (CD 2 Cl 2, 298 K): Figure S21.2 [InBr 3 (Sb i Pr 3 )] 13 C{ 1 H} NMR spectrum (CD 2 Cl 2, 298 K): = impurity S50

51 Figure S21.3 [InBr 3 (Sb i Pr 3 )] 115 In NMR spectrum (CD 2 Cl 2, 298 K): Figure S21.4 [InBr 3 (Sb i Pr 3 )] IR spectrum (Nujol): S51

52 Figure S22 [InI 3 (SbEt 3 )] Figure S22.1 [InI 3 (SbEt 3 )] 1 H NMR spectrum (CD 2 Cl 2, 298 K): Figure S22.2 [InI 3 (SbEt 3 )] 13 C{ 1 H} NMR spectrum (CD 2 Cl 2, 298 K): S52

53 Figure S22.3 [InI 3 (SbEt 3 )] 115 In NMR spectrum (CD 2 Cl 2, 298 K): Figure S22.4 [InI 3 (SbEt 3 )] IR spectrum (Nujol): S53

54 Figure S23 [InI 3 (Sb i Pr 3 )] Figure S23.1 [InI 3 (Sb i Pr 3 )] 1 H NMR spectrum (CD 2 Cl 2, 298 K): Figure S23.2 [InI 3 (Sb i Pr 3 )] 13 C{ 1 H} NMR spectrum (CD 2 Cl 2, 298 K): S54

55 Figure S23.3 [InI 3 (Sb i Pr 3 )] 115 In NMR spectrum (CD 2 Cl 2, 298 K): Figure S23.4 [InI 3 (Sb i Pr 3 )] IR spectrum (Nujol): S55

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