A dimeric calcium siloxide lightly stabilized by ammonia ligands

Reactivity of [HC{(C(Me)N(Dipp))}2Ca{N(SiMe3)2}(THF)] (Dipp=C6H3iPr2-2,6) with C–H acids: Synthesis of heteroleptic calcium η5-organometallics

“…The Ca-O [2.2857(19) Å ] and Ca-O 0 [2.2509(19) Å ] bonds are sufficiently dissimilar to allow classification of these interactions as inter-and intramolecular, respectively. Both of these distances are, however, similar to the shorter bridging Ca-(l-OSiPh 3 ) distances [range, 2.255(5)-2.334(5) Å ] observed in the dimeric calcium siloxide [Ca 2 (OSiPh 3 ) 4 (NH 3 ) 4 ] despite the reduced coordination number (4 versus 6) observed in the structure of 10 [17]. Despite an expected reduction in the overall crowding about calcium, the N(1)-Ca-N(2) bond angle [80.30 (7)°] and Ca-N distances are similar to those observed in 3-5 and in previously reported calcium species containing this ligand [1][2][3]6].…”

Copper(I) Halide Complexes with Triphenylphosphane and Heterocyclic Thione Ligands: The Crystal Structures of [Bis(Triphenylphosphane)(Benzimidazole-2-Thione)Copper(I) Iodide], [Bis(Triphenylphosphane)(Benzothiazole-2-Thione)Copper(I) Iodide], and Bis[µ-S-(Benzimidazole-2-Thione)(Triphenylphosphane)Copper(I) Chloride]

“…[20] Absence of crystal decay in the X-ray beam was confirmed by checking equivalent reflections at the beginning and end of data collection, which lasted about 8 hours. The structures were solved with SIR92 [21] and refined with SHELX93.…”

“…Cu (1)ϪP (1) 2.2822 (6) P (1)ϪC (14) 1.818 (2) Cu (1)ϪP (2) 2.2796 (6) (2) P (2)ϪCu (1)ϪP (1) 125.33 (2) C (8)ϪP (1)ϪC (20) 101.74(10) P (2)ϪCu (1)ϪS (1) 104.44 (2) C (14)ϪP (1)ϪCu (1) 115.99(7) P(1)ϪCu (1)ϪS (1) 98.82 (2) C (8)ϪP (1)ϪCu (1) 113.97(7) P(2)ϪCu (1)ϪI (1) 107.053 (17) C (20)ϪP (1)ϪCu (1) 112.95(7) P(1)ϪCu (1)ϪI (1) 108.907 (18 (2)ϪCu (1) 111.53(7) C (14)ϪP (1)ϪC (8) 104.79(10) C(38)ϪP (2)ϪCu (1) 116.77 (7) C(14)ϪP (1)ϪC (20) 106.03(10) C(32)ϪP (2)ϪCu (1) 117.68(7) Figure 2. A view of compound 2 with atom labels.…”

Heteronuclear Complexes Containing {Au2Rh}, {Au2Ir} and {AuIr} Cores with a Dithiolate Ligand Bridging the Metal Centres − X-ray Structures of [Au2Ir(μ-S2C6H4)(cod)(PPh3)2]BF4 and [AuIr(μ-S2C6H3CH3)(cod)(PPh3)]

“…Data were collected on a Delft Instruments FAST TV area detector diffractometer positioned at the window of a rotating-anode generator with graphite monochromated Mo-K α radiation (λ ϭ 0.71069 Å ), following procedures described elsewhere. [17] Structure Solution and Refinement: The structures were solved using SHELXS-86 and SHELXS-97, [18] and refined by full-matrix leastsquares on F o 2 , using the programs SHELXL-93 and SHELXL-97. [19] In the case of 5 the data were corrected with the program DIFABS, [20] and for 9 with the program SORTAV.…”