Addition of organic and inorganic moieties to Fe2(CO)6(?-EE?) and Fe3(CO)9(?3-E)(?3-E?) [E=Se, Te;E?=S, Se, Te]

Selenium-Bridged Clusters. Synthesis and Structural Characterization of the μ4-Se Twin Cluster [(μ-BuSe)Fe2(CO)6]2(μ4-Se)

“…The use of chalcogen atoms as bridging ligands in transition-metal cluster compounds continues to attract attention . While earlier work concentrated on the use of sulfur as a ligand for cluster growth and stabilization purposes, in recent times interest has been extended to the usage of selenium and tellurium. , Seyferth has reported the formation of the monoanion and dianion of Fe 2 (CO) 6 (μ-Se 2 ) using organolithium reagents and lithium triethylborohydride, respectively, and their reactions with various types of electrophiles …”

Synthesis, characterisation and nonlinear optical properties of tetrahedral clusters Cp2Mo2ME(CO)7, (M=Fe, Ru, Os; E=S, Se)

“…Ru(basal)-Se, 2.483 Å ; av. Ru(apical)-Se, 2.521 Å ) (2) C (5) 5523(6) 3482 (11) 3918 (4) 718(14) C (6) 5270 762(3) 81(4) 1668 (18) 4496(8) 4577(4) C(7) C (8) 67(3) 4054 (9) 2972 (4) 6389 (12) 60(3) 3175(7) 5715(13) C (9) 2900 (4) 2615(3) C (10) 4506 (13) 3176 (8) 59(3) 4030 (9) 60(3) 2511(3) 4431(13) C (11) 55(3) 5594 (13) 4544 (7) 2719(3) C(12) C (13) 4695 487 5) 6421(8) 2186(2168 4) 6708(72771 (18) C (14) 4325 46459 (8) 73(4) C (15) 4295 44309 (18) 6020(9) C (16) 92 5) 4611(54759 22) 4873(43432(28) 6019(8) C (17) 103 (6) absorption coefficient of the solution was 3.4 cm − 1 at 532 nm. The refractive nonlinearity (closed aperture Z-scan) was found to be considerable, as evident in the peak-valley separation in Fig.…”

“…We have had an extensive and long standing interest in the synthesis and reactivity of such clusters with primary emphasis on the study of the influence of group 16 elements S, Se and Te on the structure, reactivity and bonding pattern of mixed transition metal, non-metal carbonyl clusters [9,10]. The dinuclear and trinuclear compounds, Fe (v-E) 2 (CO) 6 and Fe 3 (v-E) 2 (CO) 9 , (E= S, Se, Te) have served as convenient starting materials for such investigations, and systematic synthesis of several classes of mixed-metal clusters have been developed using these compounds.…”

Mixed-Chalcogenide, Mixed-Metal Carbonyl Clusters. Synthesis and Characterization of Cp2Mo2Fe2(μ4-Te)(μ3-E)(μ3-E‘)(CO)6 (E, E‘ = Te; E = S, E‘ = Te; E, E‘ = S; E = S, E‘ = Se), Cp2Mo2Fe2(μ3-Te)(μ3-E)(CO)7, and Cp2Mo2Fe(μ3-E)(CO)7 (E = S, Te)

“…There has been continuing interest in chalcogen-bridged transition-metal carbonyl clusters, and there are several methods available for the incorporation of chalcogen atoms in metal complexes . The classes of compounds Fe 3 (CO) 9 (μ 3 -E 2 ) and Fe 2 (CO) 6 (μ-E 2 ) (E = S, Se, Te) have been shown to be good starting materials for obtaining chalcogen-bridged clusters . Reduction of Na 2 EO 3 with [HFe(CO) 4 ] - is a convenient route for preparing Fe 3 (CO) 9 (μ 3 -E) 2 , which can be converted into the more reactive Fe 2 (CO) 6 (μ-E 2 ) on treatment with NaOMe followed by acidification .…”

“…The compounds (CO) 6 Fe 2 {μ-SC(Ph)C(H)S} and (CO) 6 Fe 2 {μ-TeC(Ph)C(H)Te} have been obtained by different routes. Addition of mononuclear metal carbonyl groups takes place readily in a stepwise manner to give trinuclear clusters Fe 2 M(CO) 9 (μ 3 -E) 2 and tetranuclear clusters Fe 2 M 2 (CO) 9 (μ 4 -E) 2 (M = Fe, Ru). , Availability of the mixed-chalcogenide compounds Fe 3 (CO) 9 (μ 3 -E)(μ 3 -E‘) and Fe 2 (CO) 6 (μ-EE‘) (E ≠ E‘, E, E‘ = S, Se, Te) by convenient synthetic routes now gives us an opportunity to introduce a greater variety to the composition of clusters of a particular structural type. The reaction of Fe 2 (CO) 6 (μ-S 2 ) with Cp 2 Mo 2 (CO) 4 is reported to form the cis-“Braunstein” and trans-“Curtis” isomers of Cp 2 Mo 2 Fe 2 S 2 (CO) 8 …”