Charge and Configuration Evolution of Intermetalloid Clusters [(Ge₉)₂M]^q− (M/q = Ge/4, In/5, Cd/6, and K/7)

Abstract

The intermetalloid cluster syn-[(η 3 -Ge 9 ) 2 {Ge(Ni(CO) 2 ) 3 }] 4− ([1] 4− ) was prepared from the oxidative substitution reaction of [Ge 9 ] 2− and Ni(CO) 2 (PPh 3 ) 2 in pyridine of 2,2,2-crypt. Solution reactions of the Zintl phases K x MGe (M/x = In/1 and Cd/2) in ethylenediamine (en) of 18-crown-6 yielded syn-[(η 3 -Ge 9 ) 2 In] 5− ([2] 5− ) and anti-[(η 3 -Ge 9 ) 2 Cd] 6− ([3] 6− ). The X-ray crystallographic analyses reveal their metallocene-like structure with the central atoms Ge/Ni/Cd sandwiched by a couple of tricapped trigonal prismatic [Ge 9 ] units in a staggered (anti-) or eclipsed (syn-) arrangement. The central Ge in [1] 4− is further triangularly bonded to three Ni(CO) 2 to form the planar Ge(Ni(CO) 2 ) 3 fragment. [2] 5− bears a high crystallographic C 3h symmetry accounting for the eclipsed conformation.has been found to solely depend on the outmost shell electrons of the central atoms to achieve a sum of eight electrons or octet rule. The DFT theoretical calculations have been carried out to explain the influence of the cluster charge on the geometric parameters of the [Ge 9 ] units.

Snap-shots of cluster growth: structure and properties of a Zintl ion with an Fe3 core, [Fe3Sn18]4−

“…1 Cluster fusion vs. cluster oligomerisation of E 9 polyhedra, E = Ge, Sn. [14][15][16][19][20][21][22][23][24][25][26][27][28][29] the extrusion of metal in the elemental form. A further complication is that the oxidative fusion of clusters is, at least in principle, in competition with oxidative oligomerisation via the formation of exo E-E bonds (Fig.…”

Orientational Isomerism and Its Reactivity of a Main Group Sandwich Anion [Ge9‐In‐Ge9]5–

“…Very recently, the latter was also observed by the reaction of ternary phase KInGe with MesCr(CO) 3 by Xu et al . [ 54 ] The experiments of electrospray ionization mass spectrometry (ESI‐MS) of crystals 1 and 2 reveal the signals of fragments{[K(2,2,2‐crypt)] 2 [Ge 18 In]} – (Figure S10) and {[K(18‐C‐6)] 2 [Ge 18 In]} – (Figure S17).…”

Audio Retrieval with Natural Language Queries

“…While most video datasets are captured from a third-person perspective, recent research has shifted towards egocentric data, filmed from a first-person viewpoint. The egocentric datasets, EpicKitchens [5] and Ego4D [6], have been used for various tasks, such as action recognition [19,20], moment localization and video retrieval [21,22,23,24] with a focus on the video stream. We, however, focus specifically on their audio tracks.…”

“…The average number of words per sentence is 2.93 with standard deviation 1.17. Ego4D [6] & EgoMCQ [21]. Ego4D is the largest egocentric dataset with over 3,670 video hours and accompanying narrations.…”

“…Ego4D is the largest egocentric dataset with over 3,670 video hours and accompanying narrations. The EgoMCQ [21] task based on Ego4D consists of 39,751 pairs containing one description and 5 video clips each. It aims at finding the correct clip for a given description.…”